CA2736046A1 - Audio coding system using spectral hole filling - Google Patents
Audio coding system using spectral hole filling Download PDFInfo
- Publication number
- CA2736046A1 CA2736046A1 CA2736046A CA2736046A CA2736046A1 CA 2736046 A1 CA2736046 A1 CA 2736046A1 CA 2736046 A CA2736046 A CA 2736046A CA 2736046 A CA2736046 A CA 2736046A CA 2736046 A1 CA2736046 A1 CA 2736046A1
- Authority
- CA
- Canada
- Prior art keywords
- spectral components
- subband signals
- spectral
- scaling
- zero
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 230000003595 spectral effect Effects 0.000 title claims abstract 109
- 238000000034 method Methods 0.000 claims abstract 35
- 230000005236 sound signal Effects 0.000 claims abstract 23
- 230000015572 biosynthetic process Effects 0.000 claims 18
- 238000003786 synthesis reaction Methods 0.000 claims 18
- 230000000873 masking effect Effects 0.000 claims 12
- 230000002123 temporal effect Effects 0.000 claims 6
- 230000015556 catabolic process Effects 0.000 abstract 1
- 238000006731 degradation reaction Methods 0.000 abstract 1
- 238000013139 quantization Methods 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/02—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/02—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders
- G10L19/032—Quantisation or dequantisation of spectral components
- G10L19/035—Scalar quantisation
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/038—Speech enhancement, e.g. noise reduction or echo cancellation using band spreading techniques
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Multimedia (AREA)
- Computational Linguistics (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Human Computer Interaction (AREA)
- Acoustics & Sound (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Quality & Reliability (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
- Optical Elements Other Than Lenses (AREA)
- Stereophonic System (AREA)
- Information Retrieval, Db Structures And Fs Structures Therefor (AREA)
- Optical Communication System (AREA)
- Optical Recording Or Reproduction (AREA)
- Adornments (AREA)
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
- Spectrometry And Color Measurement (AREA)
- Optical Filters (AREA)
- Stereo-Broadcasting Methods (AREA)
Abstract
Audio coding processes like quantization can cause spectral components of an encoded audio signal to be set to zero, creating spectral holes in the signal.
These spectral holes can degrade the perceived quality of audio signals that are reproduced by audio coding systems. An improved decoder avoids or reduces the degradation by filling the spectral holes with synthesized spectral components. An improved encoder may also be used to realize further improvements in the decoder.
These spectral holes can degrade the perceived quality of audio signals that are reproduced by audio coding systems. An improved decoder avoids or reduces the degradation by filling the spectral holes with synthesized spectral components. An improved encoder may also be used to realize further improvements in the decoder.
Claims (45)
1. A method for generating audio information, wherein the method comprises:
receiving an input signal and obtaining therefrom a set of subband signals each having one or more spectral components representing spectral content of an audio signal;
identifying within the set of subband signals a particular subband signal in which one or more spectral components have a non-zero value and are quantized by a quantizer having a minimum quantizing level that corresponds to a threshold, and in which a plurality of spectral components have a zero value;
generating synthesized spectral components that correspond to respective zero-valued spectral components in the particular subband signal and that are scaled according to a scaling envelope less than or equal to the threshold;
generating a modified set of subband signals by substituting the synthesized spectral components for corresponding zero-valued spectral components in the particular subband signal; and generating the audio information by applying a synthesis filterbank to the modified set of subband signals.
receiving an input signal and obtaining therefrom a set of subband signals each having one or more spectral components representing spectral content of an audio signal;
identifying within the set of subband signals a particular subband signal in which one or more spectral components have a non-zero value and are quantized by a quantizer having a minimum quantizing level that corresponds to a threshold, and in which a plurality of spectral components have a zero value;
generating synthesized spectral components that correspond to respective zero-valued spectral components in the particular subband signal and that are scaled according to a scaling envelope less than or equal to the threshold;
generating a modified set of subband signals by substituting the synthesized spectral components for corresponding zero-valued spectral components in the particular subband signal; and generating the audio information by applying a synthesis filterbank to the modified set of subband signals.
2. The method according to claim 1 wherein the scaling envelope is uniform.
3. The method according to claim 1 or 2 wherein the synthesis filterbank is implemented by a block transform that has spectral leakage between adjacent spectral components and the scaling envelope varies at a rate substantially equal to a rate of roll off of the spectral leakage of the block transform.
4. The method according to any one of claims 1 through 3 wherein the synthesis filterbank is implemented by a block transform and the method comprises:
applying a frequency-domain filter to one or more spectral components in the set of subband signals; and deriving the scaling envelope from an output of the frequency-domain filter.
applying a frequency-domain filter to one or more spectral components in the set of subband signals; and deriving the scaling envelope from an output of the frequency-domain filter.
5. The method according to claim 4 that comprises varying the response of the frequency-domain filter as a function of frequency.
6. The method according to any one of claims 1 through 5 that comprises:
obtaining a measure of tonality of the audio signal represented by the set of subband signals; and adapting the scaling envelope in response to the measure of tonality.
obtaining a measure of tonality of the audio signal represented by the set of subband signals; and adapting the scaling envelope in response to the measure of tonality.
7. The method according to claim 6 that obtains the measure of tonality from the input signal.
8. The method according to claim 6 that comprises deriving the measure of tonality from the way in which the zero-valued spectral components are arranged in the particular subband signal.
9. The method according to any one of claims 1 through 8 wherein the synthesis filterbank is implemented by a block transform and the method comprises:
obtaining a sequence of sets of subband signals from the input signal;
identifying a common subband signal in the sequence of sets of subband signals where, for each set in the sequence, one or more spectral components have a non-zero value and a plurality of spectral components have a zero value;
identifying a common spectral component within the common subband signal that has a zero value in a plurality of adjacent sets in the sequence that are either preceded or followed by a set with the common spectral components having a non-zero value;
scaling the synthesized spectral components that correspond to the zero-valued common spectral components according to the scaling envelope that varies from set to set in the sequence according to temporal masking characteristics of the human auditory system;
generating a sequence of modified sets of subband signals by substituting the synthesized spectral components for the corresponding zero-valued common spectral components in the sets; and generating the audio information by applying the synthesis filterbank to the sequence of modified sets of subband signals.
obtaining a sequence of sets of subband signals from the input signal;
identifying a common subband signal in the sequence of sets of subband signals where, for each set in the sequence, one or more spectral components have a non-zero value and a plurality of spectral components have a zero value;
identifying a common spectral component within the common subband signal that has a zero value in a plurality of adjacent sets in the sequence that are either preceded or followed by a set with the common spectral components having a non-zero value;
scaling the synthesized spectral components that correspond to the zero-valued common spectral components according to the scaling envelope that varies from set to set in the sequence according to temporal masking characteristics of the human auditory system;
generating a sequence of modified sets of subband signals by substituting the synthesized spectral components for the corresponding zero-valued common spectral components in the sets; and generating the audio information by applying the synthesis filterbank to the sequence of modified sets of subband signals.
10. The method according to any one of claims 1 through 9 wherein the synthesis filterbank is implemented by a block transform and the method generates the synthesized spectral components by spectral translation of other spectral components in the set of subband signals.
11. The method according to any one of claims 1 through 10 wherein the scaling envelope varies according to temporal masking characteristics of the human auditory system.
12. A method for generating an output signal, wherein the method comprises:
generating a set of subband signals each having one or more spectral components representing spectral content of an audio signal by quantizing information that is obtained by applying an analysis filterbank to audio information;
identifying within the set of subband signals a particular subband signal in which one or more spectral components have a non-zero value and are quantized by a quantizer having a minimum quantizing level that corresponds to a threshold, and in which a plurality of spectral components have a zero value;
deriving scaling control information from the spectral content of the audio signal, wherein the scaling control information controls scaling of synthesized spectral components to be synthesized and substituted for the spectral components having a zero value in a receiver that generates audio information in response to the output signal; and generating the output signal by assembling the scaling control information and information representing the set of subband signals.
generating a set of subband signals each having one or more spectral components representing spectral content of an audio signal by quantizing information that is obtained by applying an analysis filterbank to audio information;
identifying within the set of subband signals a particular subband signal in which one or more spectral components have a non-zero value and are quantized by a quantizer having a minimum quantizing level that corresponds to a threshold, and in which a plurality of spectral components have a zero value;
deriving scaling control information from the spectral content of the audio signal, wherein the scaling control information controls scaling of synthesized spectral components to be synthesized and substituted for the spectral components having a zero value in a receiver that generates audio information in response to the output signal; and generating the output signal by assembling the scaling control information and information representing the set of subband signals.
13. The method according to claim 12 that comprises:
obtaining a measure of tonality of the audio signal represented by the set of subband signals; and deriving the scaling control information from the measure of tonality.
obtaining a measure of tonality of the audio signal represented by the set of subband signals; and deriving the scaling control information from the measure of tonality.
14. The method according to claim 12 or 13 that comprises:
obtaining an estimated psychoacoustic masking threshold of the audio signal represented by the set of subband signals; and deriving the scaling control information from the estimated psychoacoustic masking threshold.
obtaining an estimated psychoacoustic masking threshold of the audio signal represented by the set of subband signals; and deriving the scaling control information from the estimated psychoacoustic masking threshold.
15. The method according to any one of claims 12 through 14 that comprises:
obtaining two measures of spectral levels for portions of the audio signal represented by the non-zero-valued and the zero-valued spectral components; and deriving the scaling control information from the two measures of spectral levels.
obtaining two measures of spectral levels for portions of the audio signal represented by the non-zero-valued and the zero-valued spectral components; and deriving the scaling control information from the two measures of spectral levels.
16. An apparatus for generating audio information, wherein the apparatus comprises:
a deformatter that receives an input signal and obtains therefrom a set of subband signals each having one or more spectral components representing spectral content of an audio signal;
a decoder coupled to the deformatter that identifies within the set of subband signals a particular subband signal in which one or more spectral components have a non-zero value and are quantized by a quantizer having a minimum quantizing level that corresponds to a threshold, and in which a plurality of spectral components have a zero value, that generates synthesized spectral components that correspond to respective zero-valued spectral components in the particular subband signal and are scaled according to a scaling envelope less than or equal to the threshold, and that generates a modified set of subband signals by substituting the synthesized spectral components for corresponding zero-valued spectral components in the particular subband signal; and a synthesis filterbank coupled to the decoder that generates the audio information in response to the modified set of subband signals.
a deformatter that receives an input signal and obtains therefrom a set of subband signals each having one or more spectral components representing spectral content of an audio signal;
a decoder coupled to the deformatter that identifies within the set of subband signals a particular subband signal in which one or more spectral components have a non-zero value and are quantized by a quantizer having a minimum quantizing level that corresponds to a threshold, and in which a plurality of spectral components have a zero value, that generates synthesized spectral components that correspond to respective zero-valued spectral components in the particular subband signal and are scaled according to a scaling envelope less than or equal to the threshold, and that generates a modified set of subband signals by substituting the synthesized spectral components for corresponding zero-valued spectral components in the particular subband signal; and a synthesis filterbank coupled to the decoder that generates the audio information in response to the modified set of subband signals.
17. The apparatus according to claim 16 wherein the scaling envelope is uniform.
18. The apparatus according to claim 16 or 17 wherein the synthesis filterbank is implemented by a block transform that has spectral leakage between adjacent spectral components and the scaling envelope varies at a rate substantially equal to a rate of roll off of the spectral leakage of the block transform.
19. The apparatus according to any one of claims 16 through 18 wherein the synthesis filterbank is implemented by a block transform and the decoder:
applies a frequency-domain filter to one or more spectral components in the set of subband signals; and derives the scaling envelope from an output of the frequency-domain filter.
applies a frequency-domain filter to one or more spectral components in the set of subband signals; and derives the scaling envelope from an output of the frequency-domain filter.
20. The apparatus according to claim 19 wherein the decoder varies the response of the frequency-domain filter as a function of frequency.
21. The apparatus according to any one of claims 16 through 20 wherein the decoder:
obtains a measure of tonality of the audio signal represented by the set of subband signals; and adapts the scaling envelope in response to the measure of tonality.
obtains a measure of tonality of the audio signal represented by the set of subband signals; and adapts the scaling envelope in response to the measure of tonality.
22. The apparatus according to claim 21 that obtains the measure of tonality from the input signal.
23. The apparatus according to claim 21 wherein the decoder derives the measure of tonality from the way in which the zero-valued spectral components are arranged in the particular subband signal.
24. The apparatus according to any one of claims 16 through 23 wherein the synthesis filterbank is implemented by a block transform and:
the deformatter obtains a sequence of sets of subband signals from the input signal;
the decoder identifies a common subband signal in the sequence of sets of subband signals where, for each set in the sequence, one or more spectral components have a non-zero value and a plurality of spectral components have a zero value, identifies a common spectral component within the common subband signal that has a zero value in a plurality of adjacent sets in the sequence that are either preceded or followed by a set with the common spectral components having a non-zero value, scales the synthesized spectral components that correspond to the zero-valued common spectral components according to the scaling envelope that varies from set to set in the sequence according to temporal masking characteristics of the human auditory system;
and generates a sequence of modified sets of subband signals by substituting the synthesized spectral components for the corresponding zero-valued common spectral components in the sets; and the synthesis filterbank generates the audio information in response to the sequence of modified sets of subband signals.
the deformatter obtains a sequence of sets of subband signals from the input signal;
the decoder identifies a common subband signal in the sequence of sets of subband signals where, for each set in the sequence, one or more spectral components have a non-zero value and a plurality of spectral components have a zero value, identifies a common spectral component within the common subband signal that has a zero value in a plurality of adjacent sets in the sequence that are either preceded or followed by a set with the common spectral components having a non-zero value, scales the synthesized spectral components that correspond to the zero-valued common spectral components according to the scaling envelope that varies from set to set in the sequence according to temporal masking characteristics of the human auditory system;
and generates a sequence of modified sets of subband signals by substituting the synthesized spectral components for the corresponding zero-valued common spectral components in the sets; and the synthesis filterbank generates the audio information in response to the sequence of modified sets of subband signals.
25. The apparatus according to any one of claims 16 through 24 wherein the synthesis filterbank is implemented by a block transform and the decoder generates the synthesized spectral components by spectral translation of other spectral components in the set of subband signals.
26. The apparatus according to any one of claims 16 through 25 wherein the scaling envelope varies according to temporal masking characteristics of the human auditory system.
27. An apparatus for generating an output signal, wherein the apparatus comprises:
an analysis filterbank that generates in response to audio information a set of subband signals each having one or more spectral components representing spectral content of an audio signal;
quantizers coupled to the analysis filterbank that quantize the spectral components;
an encoder coupled to the quantizers that identifies within the set of subband signals a particular subband signal in which one or more spectral components have a non-zero value and are quantized by a quantizer having a minimum quantizing level that corresponds to a threshold and in which a plurality of spectral components have a zero value, derives scaling control information from the spectral content of the audio signal, wherein the scaling control information controls scaling of synthesized spectral components to be synthesized and substituted for the spectral components having a zero value in a receiver that generates audio information in response to the output signal;
and a formatter coupled to the encoder that generates the output signal by assembling the scaling control information and information representing the set of subband signals.
an analysis filterbank that generates in response to audio information a set of subband signals each having one or more spectral components representing spectral content of an audio signal;
quantizers coupled to the analysis filterbank that quantize the spectral components;
an encoder coupled to the quantizers that identifies within the set of subband signals a particular subband signal in which one or more spectral components have a non-zero value and are quantized by a quantizer having a minimum quantizing level that corresponds to a threshold and in which a plurality of spectral components have a zero value, derives scaling control information from the spectral content of the audio signal, wherein the scaling control information controls scaling of synthesized spectral components to be synthesized and substituted for the spectral components having a zero value in a receiver that generates audio information in response to the output signal;
and a formatter coupled to the encoder that generates the output signal by assembling the scaling control information and information representing the set of subband signals.
28. The apparatus according to claim 27 that:
obtains a measure of tonality of the audio signal represented by the set of subband signals; and derives the scaling control information from the measure of tonality.
obtains a measure of tonality of the audio signal represented by the set of subband signals; and derives the scaling control information from the measure of tonality.
29. The apparatus according to claim 27 or 28 comprising a modelling component that:
obtains an estimated psychoacoustic masking threshold of the audio signal represented by the set of subband signals; and derives the scaling control information from the estimated psychoacoustic masking threshold.
obtains an estimated psychoacoustic masking threshold of the audio signal represented by the set of subband signals; and derives the scaling control information from the estimated psychoacoustic masking threshold.
30. The apparatus according to any one of claims 27 through 29 that:
obtains two measures of spectral levels for portions of the audio signal represented by the non-zero-valued and the zero-valued spectral components;
and derives the scaling control information from the two measures of spectral levels.
obtains two measures of spectral levels for portions of the audio signal represented by the non-zero-valued and the zero-valued spectral components;
and derives the scaling control information from the two measures of spectral levels.
31. A medium that conveys a program of instructions and is readable by a device for executing the program of instructions to perform a method for generating audio information, wherein the method comprises:
receiving an input signal and obtaining therefrom a set of subband signals each having one or more spectral components representing spectral content of an audio signal;
identifying within the set of subband signals a particular subband signal in which one or more spectral components have a non-zero value and are quantized by a quantizer having a minimum quantizing level that corresponds to a threshold, and in which a plurality of spectral components have a zero value;
generating synthesized spectral components that correspond to respective zero-valued spectral components in the particular subband signal and that are scaled according to a scaling envelope less than or equal to the threshold;
generating a modified set of subband signals by substituting the synthesized spectral components for corresponding zero-valued spectral components in the particular subband signal; and generating the audio information by applying a synthesis filterbank to the modified set of subband signals.
receiving an input signal and obtaining therefrom a set of subband signals each having one or more spectral components representing spectral content of an audio signal;
identifying within the set of subband signals a particular subband signal in which one or more spectral components have a non-zero value and are quantized by a quantizer having a minimum quantizing level that corresponds to a threshold, and in which a plurality of spectral components have a zero value;
generating synthesized spectral components that correspond to respective zero-valued spectral components in the particular subband signal and that are scaled according to a scaling envelope less than or equal to the threshold;
generating a modified set of subband signals by substituting the synthesized spectral components for corresponding zero-valued spectral components in the particular subband signal; and generating the audio information by applying a synthesis filterbank to the modified set of subband signals.
32. The medium according to claim 31 wherein the scaling envelope is uniform.
33. The medium according to claim 31 or 32 wherein the synthesis filterbank is implemented by a block transform that has spectral leakage between adjacent spectral components and the scaling envelope varies at a rate substantially equal to a rate of roll off of the spectral leakage of the block transform.
34. The medium according to any one of claims 31 through 33 wherein the synthesis filterbank is implemented by a block transform and the method comprises:
applying a frequency-domain filter to one or more spectral components in the set of subband signals; and deriving the scaling envelope from an output of the frequency-domain filter.
applying a frequency-domain filter to one or more spectral components in the set of subband signals; and deriving the scaling envelope from an output of the frequency-domain filter.
35. The medium according to claim 34 wherein the method comprises varying the response of the frequency-domain filter as a function of frequency.
36. The medium according to any one of claims 31 through 35 wherein the method comprises:
obtaining a measure of tonality of the audio signal represented by the set of subband signals; and adapting the scaling envelope in response to the measure of tonality.
obtaining a measure of tonality of the audio signal represented by the set of subband signals; and adapting the scaling envelope in response to the measure of tonality.
37. The medium according to claim 36 wherein the method obtains the measure of tonality from the input signal.
38. The medium according to claim 36 wherein the method comprises deriving the measure of tonality from the way in which the zero-valued spectral components are arranged in the particular subband signal.
39. The medium according to any one of claims 31 through 38 wherein the synthesis filterbank is implemented by a block transform and the method comprises:
obtaining a sequence of sets of subband signals from the input signal;
identifying a common subband signal in the sequence of sets of subband signals where, for each set in the sequence, one or more spectral components have a non-zero value and a plurality of spectral components have a zero value;
identifying a common spectral component within the common subband signal that has a zero value in a plurality of adjacent sets in the sequence that are either preceded or followed by a set with the common spectral components having a non-zero value;
scaling the synthesized spectral components that correspond to the zero-valued common spectral components according to the scaling envelope that varies from set to set in the sequence according to temporal masking characteristics of the human auditory system;
generating a sequence of modified sets of subband signals by substituting the synthesized spectral components for the corresponding zero-valued common spectral components in the sets; and generating the audio information by applying the synthesis filterbank to the sequence of modified sets of subband signals.
obtaining a sequence of sets of subband signals from the input signal;
identifying a common subband signal in the sequence of sets of subband signals where, for each set in the sequence, one or more spectral components have a non-zero value and a plurality of spectral components have a zero value;
identifying a common spectral component within the common subband signal that has a zero value in a plurality of adjacent sets in the sequence that are either preceded or followed by a set with the common spectral components having a non-zero value;
scaling the synthesized spectral components that correspond to the zero-valued common spectral components according to the scaling envelope that varies from set to set in the sequence according to temporal masking characteristics of the human auditory system;
generating a sequence of modified sets of subband signals by substituting the synthesized spectral components for the corresponding zero-valued common spectral components in the sets; and generating the audio information by applying the synthesis filterbank to the sequence of modified sets of subband signals.
40. The medium according to any one of claims 31 through 39 wherein the synthesis filterbank is implemented by a block transform and the method generates the synthesized spectral components by spectral translation of other spectral components in the set of subband signals.
41. The medium according to any one of claims 31 through 40 wherein the scaling envelope varies according to temporal masking characteristics of the human auditory system.
42. A medium that conveys a program of instructions and is readable by a device for executing the program of instructions to perform a method for generating an output signal, wherein the method comprises:
generating a set of subband signals each having one or more spectral components representing spectral content of an audio signal by quantizing information that is obtained by applying an analysis filterbank to audio information;
identifying within the set of subband signals a particular subband signal in which one or more spectral components have a non-zero value and are quantized by a quantizer having a minimum quantizing level that corresponds to a threshold, and in which a plurality of spectral components have a zero value;
deriving scaling control information from the spectral content of the audio signal, wherein the scaling control information controls scaling of synthesized spectral components to be synthesized and substituted for the spectral components having a zero value in a receiver that generates audio information in response to the output signal; and generating the output signal by assembling the scaling control information and information representing the set of subband signals.
generating a set of subband signals each having one or more spectral components representing spectral content of an audio signal by quantizing information that is obtained by applying an analysis filterbank to audio information;
identifying within the set of subband signals a particular subband signal in which one or more spectral components have a non-zero value and are quantized by a quantizer having a minimum quantizing level that corresponds to a threshold, and in which a plurality of spectral components have a zero value;
deriving scaling control information from the spectral content of the audio signal, wherein the scaling control information controls scaling of synthesized spectral components to be synthesized and substituted for the spectral components having a zero value in a receiver that generates audio information in response to the output signal; and generating the output signal by assembling the scaling control information and information representing the set of subband signals.
43. The medium according to claim 42 wherein the method comprises:
obtaining a measure of tonality of the audio signal represented by the set of subband signals; and deriving the scaling control information from the measure of tonality.
obtaining a measure of tonality of the audio signal represented by the set of subband signals; and deriving the scaling control information from the measure of tonality.
44. The medium according to claim 42 or 43 wherein the method comprises:
obtaining an estimated psychoacoustic masking threshold of the audio signal represented by the set of subband signals; and deriving the scaling control information from the estimated psychoacoustic masking threshold.
obtaining an estimated psychoacoustic masking threshold of the audio signal represented by the set of subband signals; and deriving the scaling control information from the estimated psychoacoustic masking threshold.
45. The medium according to any one of claims 42 through 44 wherein the method comprises:
obtaining two measures of spectral levels for portions of the audio signal represented by the non-zero-valued and the zero-valued spectral components; and deriving the scaling control information from the two measures of spectral levels.
obtaining two measures of spectral levels for portions of the audio signal represented by the non-zero-valued and the zero-valued spectral components; and deriving the scaling control information from the two measures of spectral levels.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/174,493 US7447631B2 (en) | 2002-06-17 | 2002-06-17 | Audio coding system using spectral hole filling |
| US10/174,493 | 2002-06-17 | ||
| CA2489441A CA2489441C (en) | 2002-06-17 | 2003-05-30 | Audio coding system using spectral hole filling |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2489441A Division CA2489441C (en) | 2002-06-17 | 2003-05-30 | Audio coding system using spectral hole filling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2736046A1 true CA2736046A1 (en) | 2003-12-24 |
Family
ID=29733607
Family Applications (6)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2736046A Abandoned CA2736046A1 (en) | 2002-06-17 | 2003-05-30 | Audio coding system using spectral hole filling |
| CA2736055A Expired - Lifetime CA2736055C (en) | 2002-06-17 | 2003-05-30 | Audio coding system using spectral hole filling |
| CA2489441A Expired - Lifetime CA2489441C (en) | 2002-06-17 | 2003-05-30 | Audio coding system using spectral hole filling |
| CA2735830A Expired - Lifetime CA2735830C (en) | 2002-06-17 | 2003-05-30 | Audio coding system using spectral hole filling |
| CA2736065A Expired - Lifetime CA2736065C (en) | 2002-06-17 | 2003-06-09 | Audio coding system using characteristics of a decoded signal to adapt synthesized spectral components |
| CA2736060A Expired - Lifetime CA2736060C (en) | 2002-06-17 | 2003-06-09 | Audio coding system using characteristics of a decoded signal to adapt synthesized spectral components |
Family Applications After (5)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2736055A Expired - Lifetime CA2736055C (en) | 2002-06-17 | 2003-05-30 | Audio coding system using spectral hole filling |
| CA2489441A Expired - Lifetime CA2489441C (en) | 2002-06-17 | 2003-05-30 | Audio coding system using spectral hole filling |
| CA2735830A Expired - Lifetime CA2735830C (en) | 2002-06-17 | 2003-05-30 | Audio coding system using spectral hole filling |
| CA2736065A Expired - Lifetime CA2736065C (en) | 2002-06-17 | 2003-06-09 | Audio coding system using characteristics of a decoded signal to adapt synthesized spectral components |
| CA2736060A Expired - Lifetime CA2736060C (en) | 2002-06-17 | 2003-06-09 | Audio coding system using characteristics of a decoded signal to adapt synthesized spectral components |
Country Status (20)
| Country | Link |
|---|---|
| US (4) | US7447631B2 (en) |
| EP (6) | EP1736966B1 (en) |
| JP (6) | JP4486496B2 (en) |
| KR (5) | KR100991448B1 (en) |
| CN (1) | CN100369109C (en) |
| AT (7) | ATE536615T1 (en) |
| CA (6) | CA2736046A1 (en) |
| DE (3) | DE60310716T8 (en) |
| DK (3) | DK1514261T3 (en) |
| ES (1) | ES2275098T3 (en) |
| HK (6) | HK1070729A1 (en) |
| IL (2) | IL165650A (en) |
| MX (1) | MXPA04012539A (en) |
| MY (2) | MY159022A (en) |
| PL (1) | PL208344B1 (en) |
| PT (1) | PT2216777E (en) |
| SG (3) | SG177013A1 (en) |
| SI (2) | SI2209115T1 (en) |
| TW (1) | TWI352969B (en) |
| WO (1) | WO2003107328A1 (en) |
Families Citing this family (144)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7742927B2 (en) * | 2000-04-18 | 2010-06-22 | France Telecom | Spectral enhancing method and device |
| DE10134471C2 (en) * | 2001-02-28 | 2003-05-22 | Fraunhofer Ges Forschung | Method and device for characterizing a signal and method and device for generating an indexed signal |
| US7240001B2 (en) | 2001-12-14 | 2007-07-03 | Microsoft Corporation | Quality improvement techniques in an audio encoder |
| US7447631B2 (en) | 2002-06-17 | 2008-11-04 | Dolby Laboratories Licensing Corporation | Audio coding system using spectral hole filling |
| JP2005532586A (en) * | 2002-07-08 | 2005-10-27 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Audio processing |
| US7889783B2 (en) * | 2002-12-06 | 2011-02-15 | Broadcom Corporation | Multiple data rate communication system |
| EP1629463B1 (en) | 2003-05-28 | 2007-08-22 | Dolby Laboratories Licensing Corporation | Method, apparatus and computer program for calculating and adjusting the perceived loudness of an audio signal |
| US7461003B1 (en) * | 2003-10-22 | 2008-12-02 | Tellabs Operations, Inc. | Methods and apparatus for improving the quality of speech signals |
| US7460990B2 (en) | 2004-01-23 | 2008-12-02 | Microsoft Corporation | Efficient coding of digital media spectral data using wide-sense perceptual similarity |
| RU2381571C2 (en) * | 2004-03-12 | 2010-02-10 | Нокиа Корпорейшн | Synthesisation of monophonic sound signal based on encoded multichannel sound signal |
| EP3336843B1 (en) * | 2004-05-14 | 2021-06-23 | Panasonic Intellectual Property Corporation of America | Speech coding method and speech coding apparatus |
| KR20070012832A (en) * | 2004-05-19 | 2007-01-29 | 마츠시타 덴끼 산교 가부시키가이샤 | Encoding device, decoding device, and method thereof |
| EP1782419A1 (en) * | 2004-08-17 | 2007-05-09 | Koninklijke Philips Electronics N.V. | Scalable audio coding |
| US20090182563A1 (en) * | 2004-09-23 | 2009-07-16 | Koninklijke Philips Electronics, N.V. | System and a method of processing audio data, a program element and a computer-readable medium |
| CN101048935B (en) | 2004-10-26 | 2011-03-23 | 杜比实验室特许公司 | Method and device for controlling the perceived loudness and/or the perceived spectral balance of an audio signal |
| US8199933B2 (en) | 2004-10-26 | 2012-06-12 | Dolby Laboratories Licensing Corporation | Calculating and adjusting the perceived loudness and/or the perceived spectral balance of an audio signal |
| KR100657916B1 (en) * | 2004-12-01 | 2006-12-14 | 삼성전자주식회사 | Apparatus and method for processing audio signal using correlation between bands |
| KR100707173B1 (en) * | 2004-12-21 | 2007-04-13 | 삼성전자주식회사 | Low bitrate encoding/decoding method and apparatus |
| US7546240B2 (en) | 2005-07-15 | 2009-06-09 | Microsoft Corporation | Coding with improved time resolution for selected segments via adaptive block transformation of a group of samples from a subband decomposition |
| US7630882B2 (en) * | 2005-07-15 | 2009-12-08 | Microsoft Corporation | Frequency segmentation to obtain bands for efficient coding of digital media |
| KR100851970B1 (en) * | 2005-07-15 | 2008-08-12 | 삼성전자주식회사 | Method and apparatus for extracting ISCImportant Spectral Component of audio signal, and method and appartus for encoding/decoding audio signal with low bitrate using it |
| US7562021B2 (en) * | 2005-07-15 | 2009-07-14 | Microsoft Corporation | Modification of codewords in dictionary used for efficient coding of digital media spectral data |
| US8121848B2 (en) * | 2005-09-08 | 2012-02-21 | Pan Pacific Plasma Llc | Bases dictionary for low complexity matching pursuits data coding and decoding |
| US20070053603A1 (en) * | 2005-09-08 | 2007-03-08 | Monro Donald M | Low complexity bases matching pursuits data coding and decoding |
| US7813573B2 (en) * | 2005-09-08 | 2010-10-12 | Monro Donald M | Data coding and decoding with replicated matching pursuits |
| US7848584B2 (en) * | 2005-09-08 | 2010-12-07 | Monro Donald M | Reduced dimension wavelet matching pursuits coding and decoding |
| US8126706B2 (en) * | 2005-12-09 | 2012-02-28 | Acoustic Technologies, Inc. | Music detector for echo cancellation and noise reduction |
| TWI517562B (en) | 2006-04-04 | 2016-01-11 | 杜比實驗室特許公司 | Method, apparatus, and computer program for scaling the overall perceived loudness of a multichannel audio signal by a desired amount |
| EP2002426B1 (en) | 2006-04-04 | 2009-09-02 | Dolby Laboratories Licensing Corporation | Audio signal loudness measurement and modification in the mdct domain |
| JP2009534713A (en) * | 2006-04-24 | 2009-09-24 | ネロ アーゲー | Apparatus and method for encoding digital audio data having a reduced bit rate |
| ATE493794T1 (en) | 2006-04-27 | 2011-01-15 | Dolby Lab Licensing Corp | SOUND GAIN CONTROL WITH CAPTURE OF AUDIENCE EVENTS BASED ON SPECIFIC VOLUME |
| US20070270987A1 (en) * | 2006-05-18 | 2007-11-22 | Sharp Kabushiki Kaisha | Signal processing method, signal processing apparatus and recording medium |
| JP4940308B2 (en) | 2006-10-20 | 2012-05-30 | ドルビー ラボラトリーズ ライセンシング コーポレイション | Audio dynamics processing using reset |
| US8521314B2 (en) | 2006-11-01 | 2013-08-27 | Dolby Laboratories Licensing Corporation | Hierarchical control path with constraints for audio dynamics processing |
| US8639500B2 (en) * | 2006-11-17 | 2014-01-28 | Samsung Electronics Co., Ltd. | Method, medium, and apparatus with bandwidth extension encoding and/or decoding |
| KR101379263B1 (en) * | 2007-01-12 | 2014-03-28 | 삼성전자주식회사 | Method and apparatus for decoding bandwidth extension |
| AU2012261547B2 (en) * | 2007-03-09 | 2014-04-17 | Skype | Speech coding system and method |
| GB0704622D0 (en) * | 2007-03-09 | 2007-04-18 | Skype Ltd | Speech coding system and method |
| KR101411900B1 (en) * | 2007-05-08 | 2014-06-26 | 삼성전자주식회사 | Method and apparatus for encoding and decoding audio signal |
| US7774205B2 (en) * | 2007-06-15 | 2010-08-10 | Microsoft Corporation | Coding of sparse digital media spectral data |
| US7761290B2 (en) | 2007-06-15 | 2010-07-20 | Microsoft Corporation | Flexible frequency and time partitioning in perceptual transform coding of audio |
| US8046214B2 (en) | 2007-06-22 | 2011-10-25 | Microsoft Corporation | Low complexity decoder for complex transform coding of multi-channel sound |
| US7885819B2 (en) | 2007-06-29 | 2011-02-08 | Microsoft Corporation | Bitstream syntax for multi-process audio decoding |
| WO2009011827A1 (en) | 2007-07-13 | 2009-01-22 | Dolby Laboratories Licensing Corporation | Audio processing using auditory scene analysis and spectral skewness |
| CA2698031C (en) | 2007-08-27 | 2016-10-18 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and device for noise filling |
| JP5183741B2 (en) | 2007-08-27 | 2013-04-17 | テレフオンアクチーボラゲット エル エム エリクソン（パブル） | Transition frequency adaptation between noise replenishment and band extension |
| ATE501506T1 (en) * | 2007-09-12 | 2011-03-15 | Dolby Lab Licensing Corp | VOICE EXTENSION WITH ADJUSTMENT OF NOISE LEVEL ESTIMATES |
| JP5302968B2 (en) * | 2007-09-12 | 2013-10-02 | ドルビー ラボラトリーズ ライセンシング コーポレイション | Speech improvement with speech clarification |
| US8249883B2 (en) | 2007-10-26 | 2012-08-21 | Microsoft Corporation | Channel extension coding for multi-channel source |
| WO2009084918A1 (en) * | 2007-12-31 | 2009-07-09 | Lg Electronics Inc. | A method and an apparatus for processing an audio signal |
| MY154452A (en) * | 2008-07-11 | 2015-06-15 | Fraunhofer Ges Forschung | An apparatus and a method for decoding an encoded audio signal |
| EP2410522B1 (en) * | 2008-07-11 | 2017-10-04 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Audio signal encoder, method for encoding an audio signal and computer program |
| PL3246918T3 (en) * | 2008-07-11 | 2023-11-06 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Audio decoder, method for decoding an audio signal and computer program |
| CN102099855B (en) * | 2008-08-08 | 2012-09-26 | 松下电器产业株式会社 | Spectral smoothing device, encoding device, decoding device, communication terminal device, base station device, and spectral smoothing method |
| WO2010028297A1 (en) | 2008-09-06 | 2010-03-11 | GH Innovation, Inc. | Selective bandwidth extension |
| US8515747B2 (en) * | 2008-09-06 | 2013-08-20 | Huawei Technologies Co., Ltd. | Spectrum harmonic/noise sharpness control |
| WO2010028299A1 (en) * | 2008-09-06 | 2010-03-11 | Huawei Technologies Co., Ltd. | Noise-feedback for spectral envelope quantization |
| WO2010028292A1 (en) * | 2008-09-06 | 2010-03-11 | Huawei Technologies Co., Ltd. | Adaptive frequency prediction |
| WO2010031003A1 (en) | 2008-09-15 | 2010-03-18 | Huawei Technologies Co., Ltd. | Adding second enhancement layer to celp based core layer |
| US8577673B2 (en) * | 2008-09-15 | 2013-11-05 | Huawei Technologies Co., Ltd. | CELP post-processing for music signals |
| WO2010053287A2 (en) * | 2008-11-04 | 2010-05-14 | Lg Electronics Inc. | An apparatus for processing an audio signal and method thereof |
| GB2466201B (en) * | 2008-12-10 | 2012-07-11 | Skype Ltd | Regeneration of wideband speech |
| US9947340B2 (en) * | 2008-12-10 | 2018-04-17 | Skype | Regeneration of wideband speech |
| GB0822537D0 (en) | 2008-12-10 | 2009-01-14 | Skype Ltd | Regeneration of wideband speech |
| TWI716833B (en) * | 2009-02-18 | 2021-01-21 | 瑞典商杜比國際公司 | Complex exponential modulated filter bank for high frequency reconstruction or parametric stereo |
| TWI597938B (en) * | 2009-02-18 | 2017-09-01 | 杜比國際公司 | Low delay modulated filter bank |
| KR101078378B1 (en) * | 2009-03-04 | 2011-10-31 | 주식회사 코아로직 | Method and Apparatus for Quantization of Audio Encoder |
| EP2555191A1 (en) * | 2009-03-31 | 2013-02-06 | Huawei Technologies Co., Ltd. | Method and device for audio signal denoising |
| JP5754899B2 (en) | 2009-10-07 | 2015-07-29 | ソニー株式会社 | Decoding apparatus and method, and program |
| EP2491553B1 (en) * | 2009-10-20 | 2016-10-12 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Audio encoder, audio decoder, method for encoding an audio information, method for decoding an audio information and computer program using an iterative interval size reduction |
| US9117458B2 (en) * | 2009-11-12 | 2015-08-25 | Lg Electronics Inc. | Apparatus for processing an audio signal and method thereof |
| US9838784B2 (en) | 2009-12-02 | 2017-12-05 | Knowles Electronics, Llc | Directional audio capture |
| CN102792370B (en) | 2010-01-12 | 2014-08-06 | 弗劳恩霍弗实用研究促进协会 | Audio encoder, audio decoder, method for encoding and audio information and method for decoding an audio information using a hash table describing both significant state values and interval boundaries |
| EP4250290A1 (en) | 2010-01-19 | 2023-09-27 | Dolby International AB | Improved subband block based harmonic transposition |
| TWI557723B (en) | 2010-02-18 | 2016-11-11 | 杜比實驗室特許公司 | Decoding method and system |
| JPWO2011121955A1 (en) * | 2010-03-30 | 2013-07-04 | パナソニック株式会社 | Audio equipment |
| JP5850216B2 (en) | 2010-04-13 | 2016-02-03 | ソニー株式会社 | Signal processing apparatus and method, encoding apparatus and method, decoding apparatus and method, and program |
| JP5609737B2 (en) | 2010-04-13 | 2014-10-22 | ソニー株式会社 | Signal processing apparatus and method, encoding apparatus and method, decoding apparatus and method, and program |
| US8798290B1 (en) | 2010-04-21 | 2014-08-05 | Audience, Inc. | Systems and methods for adaptive signal equalization |
| US9558755B1 (en) | 2010-05-20 | 2017-01-31 | Knowles Electronics, Llc | Noise suppression assisted automatic speech recognition |
| WO2011156905A2 (en) * | 2010-06-17 | 2011-12-22 | Voiceage Corporation | Multi-rate algebraic vector quantization with supplemental coding of missing spectrum sub-bands |
| US9236063B2 (en) | 2010-07-30 | 2016-01-12 | Qualcomm Incorporated | Systems, methods, apparatus, and computer-readable media for dynamic bit allocation |
| JP6075743B2 (en) * | 2010-08-03 | 2017-02-08 | ソニー株式会社 | Signal processing apparatus and method, and program |
| US9208792B2 (en) * | 2010-08-17 | 2015-12-08 | Qualcomm Incorporated | Systems, methods, apparatus, and computer-readable media for noise injection |
| WO2012037515A1 (en) | 2010-09-17 | 2012-03-22 | Xiph. Org. | Methods and systems for adaptive time-frequency resolution in digital data coding |
| JP5707842B2 (en) | 2010-10-15 | 2015-04-30 | ソニー株式会社 | Encoding apparatus and method, decoding apparatus and method, and program |
| US20130173275A1 (en) * | 2010-10-18 | 2013-07-04 | Panasonic Corporation | Audio encoding device and audio decoding device |
| CN103443856B (en) * | 2011-03-04 | 2015-09-09 | 瑞典爱立信有限公司 | Rear quantification gain calibration in audio coding |
| US9009036B2 (en) | 2011-03-07 | 2015-04-14 | Xiph.org Foundation | Methods and systems for bit allocation and partitioning in gain-shape vector quantization for audio coding |
| US9015042B2 (en) * | 2011-03-07 | 2015-04-21 | Xiph.org Foundation | Methods and systems for avoiding partial collapse in multi-block audio coding |
| WO2012122303A1 (en) | 2011-03-07 | 2012-09-13 | Xiph. Org | Method and system for two-step spreading for tonal artifact avoidance in audio coding |
| EP2684190B1 (en) | 2011-03-10 | 2015-11-18 | Telefonaktiebolaget L M Ericsson (PUBL) | Filling of non-coded sub-vectors in transform coded audio signals |
| US8706509B2 (en) * | 2011-04-15 | 2014-04-22 | Telefonaktiebolaget L M Ericsson (Publ) | Method and a decoder for attenuation of signal regions reconstructed with low accuracy |
| TWI562133B (en) | 2011-05-13 | 2016-12-11 | Samsung Electronics Co Ltd | Bit allocating method and non-transitory computer-readable recording medium |
| US9264094B2 (en) * | 2011-06-09 | 2016-02-16 | Panasonic Intellectual Property Corporation Of America | Voice coding device, voice decoding device, voice coding method and voice decoding method |
| JP2013007944A (en) | 2011-06-27 | 2013-01-10 | Sony Corp | Signal processing apparatus, signal processing method, and program |
| US20130006644A1 (en) * | 2011-06-30 | 2013-01-03 | Zte Corporation | Method and device for spectral band replication, and method and system for audio decoding |
| JP5997592B2 (en) * | 2012-04-27 | 2016-09-28 | 株式会社Ｎｔｔドコモ | Speech decoder |
| WO2013188562A2 (en) * | 2012-06-12 | 2013-12-19 | Audience, Inc. | Bandwidth extension via constrained synthesis |
| EP2717263B1 (en) * | 2012-10-05 | 2016-11-02 | Nokia Technologies Oy | Method, apparatus, and computer program product for categorical spatial analysis-synthesis on the spectrum of a multichannel audio signal |
| CN103854653B (en) | 2012-12-06 | 2016-12-28 | 华为技术有限公司 | The method and apparatus of signal decoding |
| BR112015017748B1 (en) * | 2013-01-29 | 2022-03-15 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E. V. | FILLING NOISE IN PERCEPTUAL TRANSFORMED AUDIO CODING |
| BR112015018050B1 (en) | 2013-01-29 | 2021-02-23 | Fraunhofer-Gesellschaft zur Förderung der Angewandten ForschungE.V. | QUANTIZATION OF LOW-COMPLEXITY ADAPTIVE TONALITY AUDIO SIGNAL |
| KR102072365B1 (en) | 2013-04-05 | 2020-02-03 | 돌비 인터네셔널 에이비 | Advanced quantizer |
| JP6157926B2 (en) * | 2013-05-24 | 2017-07-05 | 株式会社東芝 | Audio processing apparatus, method and program |
| EP2830055A1 (en) | 2013-07-22 | 2015-01-28 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Context-based entropy coding of sample values of a spectral envelope |
| EP2830060A1 (en) * | 2013-07-22 | 2015-01-28 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Noise filling in multichannel audio coding |
| EP2830063A1 (en) | 2013-07-22 | 2015-01-28 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Apparatus, method and computer program for decoding an encoded audio signal |
| JP6531649B2 (en) | 2013-09-19 | 2019-06-19 | ソニー株式会社 | Encoding apparatus and method, decoding apparatus and method, and program |
| RU2764260C2 (en) | 2013-12-27 | 2022-01-14 | Сони Корпорейшн | Decoding device and method |
| EP2919232A1 (en) * | 2014-03-14 | 2015-09-16 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Encoder, decoder and method for encoding and decoding |
| JP6035270B2 (en) | 2014-03-24 | 2016-11-30 | 株式会社Ｎｔｔドコモ | Speech decoding apparatus, speech encoding apparatus, speech decoding method, speech encoding method, speech decoding program, and speech encoding program |
| RU2572664C2 (en) * | 2014-06-04 | 2016-01-20 | Российская Федерация, От Имени Которой Выступает Министерство Промышленности И Торговли Российской Федерации | Device for active vibration suppression |
| EP2980795A1 (en) | 2014-07-28 | 2016-02-03 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Audio encoding and decoding using a frequency domain processor, a time domain processor and a cross processor for initialization of the time domain processor |
| EP2980794A1 (en) * | 2014-07-28 | 2016-02-03 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Audio encoder and decoder using a frequency domain processor and a time domain processor |
| MA40417A (en) | 2014-08-08 | 2017-06-14 | Raffaele Migliaccio | Mixture of fatty acids and palmitoylethanolamide for use in the treatment of inflammatory and allergic pathologies |
| WO2016040885A1 (en) | 2014-09-12 | 2016-03-17 | Audience, Inc. | Systems and methods for restoration of speech components |
| WO2016072628A1 (en) * | 2014-11-07 | 2016-05-12 | 삼성전자 주식회사 | Method and apparatus for restoring audio signal |
| US9691408B2 (en) | 2014-12-16 | 2017-06-27 | Psyx Research, Inc. | System and method for dynamic equalization of audio data |
| CN107210824A (en) | 2015-01-30 | 2017-09-26 | 美商楼氏电子有限公司 | The environment changing of microphone |
| TWI693594B (en) * | 2015-03-13 | 2020-05-11 | 瑞典商杜比國際公司 | Decoding audio bitstreams with enhanced spectral band replication metadata in at least one fill element |
| US10553228B2 (en) * | 2015-04-07 | 2020-02-04 | Dolby International Ab | Audio coding with range extension |
| US20170024495A1 (en) * | 2015-07-21 | 2017-01-26 | Positive Grid LLC | Method of modeling characteristics of a musical instrument |
| RU2714365C1 (en) * | 2016-03-07 | 2020-02-14 | Фраунхофер-Гезелльшафт Цур Фердерунг Дер Ангевандтен Форшунг Е.Ф. | Hybrid masking method: combined masking of packet loss in frequency and time domain in audio codecs |
| DE102016104665A1 (en) | 2016-03-14 | 2017-09-14 | Ask Industries Gmbh | Method and device for processing a lossy compressed audio signal |
| JP2018092012A (en) * | 2016-12-05 | 2018-06-14 | ソニー株式会社 | Information processing device, information processing method, and program |
| WO2018106088A1 (en) * | 2016-12-09 | 2018-06-14 | 주식회사 엘지화학 | Sealant composition |
| WO2019091573A1 (en) | 2017-11-10 | 2019-05-16 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Apparatus and method for encoding and decoding an audio signal using downsampling or interpolation of scale parameters |
| EP3483882A1 (en) | 2017-11-10 | 2019-05-15 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Controlling bandwidth in encoders and/or decoders |
| EP3483878A1 (en) | 2017-11-10 | 2019-05-15 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Audio decoder supporting a set of different loss concealment tools |
| EP3483886A1 (en) | 2017-11-10 | 2019-05-15 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Selecting pitch lag |
| EP3483884A1 (en) | 2017-11-10 | 2019-05-15 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Signal filtering |
| EP3483883A1 (en) | 2017-11-10 | 2019-05-15 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Audio coding and decoding with selective postfiltering |
| EP3483879A1 (en) | 2017-11-10 | 2019-05-15 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Analysis/synthesis windowing function for modulated lapped transformation |
| EP3483880A1 (en) | 2017-11-10 | 2019-05-15 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Temporal noise shaping |
| WO2019091576A1 (en) | 2017-11-10 | 2019-05-16 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Audio encoders, audio decoders, methods and computer programs adapting an encoding and decoding of least significant bits |
| US10950251B2 (en) * | 2018-03-05 | 2021-03-16 | Dts, Inc. | Coding of harmonic signals in transform-based audio codecs |
| EP3544005B1 (en) | 2018-03-22 | 2021-12-15 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Audio coding with dithered quantization |
| CN114242089A (en) | 2018-04-25 | 2022-03-25 | 杜比国际公司 | Integration of high frequency reconstruction techniques with reduced post-processing delay |
| AU2019258524B2 (en) | 2018-04-25 | 2024-03-28 | Dolby International Ab | Integration of high frequency audio reconstruction techniques |
| WO2023117145A1 (en) * | 2021-12-23 | 2023-06-29 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Method and apparatus for spectrotemporally improved spectral gap filling in audio coding using different noise filling methods |
| TW202333143A (en) * | 2021-12-23 | 2023-08-16 | 弗勞恩霍夫爾協會 | Method and apparatus for spectrotemporally improved spectral gap filling in audio coding using a filtering |
| TW202334940A (en) * | 2021-12-23 | 2023-09-01 | 紐倫堡大學 | Method and apparatus for spectrotemporally improved spectral gap filling in audio coding using different noise filling methods |
| WO2023117146A1 (en) * | 2021-12-23 | 2023-06-29 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Method and apparatus for spectrotemporally improved spectral gap filling in audio coding using a filtering |
Family Cites Families (68)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US36478A (en) * | 1862-09-16 | Improved can or tank for coal-oil | ||
| US3995115A (en) * | 1967-08-25 | 1976-11-30 | Bell Telephone Laboratories, Incorporated | Speech privacy system |
| US3684838A (en) * | 1968-06-26 | 1972-08-15 | Kahn Res Lab | Single channel audio signal transmission system |
| JPS6011360B2 (en) * | 1981-12-15 | 1985-03-25 | ケイディディ株式会社 | Audio encoding method |
| US4667340A (en) * | 1983-04-13 | 1987-05-19 | Texas Instruments Incorporated | Voice messaging system with pitch-congruent baseband coding |
| WO1986003873A1 (en) * | 1984-12-20 | 1986-07-03 | Gte Laboratories Incorporated | Method and apparatus for encoding speech |
| US4790016A (en) * | 1985-11-14 | 1988-12-06 | Gte Laboratories Incorporated | Adaptive method and apparatus for coding speech |
| US4885790A (en) | 1985-03-18 | 1989-12-05 | Massachusetts Institute Of Technology | Processing of acoustic waveforms |
| US4935963A (en) * | 1986-01-24 | 1990-06-19 | Racal Data Communications Inc. | Method and apparatus for processing speech signals |
| JPS62234435A (en) * | 1986-04-04 | 1987-10-14 | Kokusai Denshin Denwa Co Ltd <Kdd> | Voice coding system |
| DE3683767D1 (en) * | 1986-04-30 | 1992-03-12 | Ibm | VOICE CODING METHOD AND DEVICE FOR CARRYING OUT THIS METHOD. |
| US4776014A (en) * | 1986-09-02 | 1988-10-04 | General Electric Company | Method for pitch-aligned high-frequency regeneration in RELP vocoders |
| US5054072A (en) * | 1987-04-02 | 1991-10-01 | Massachusetts Institute Of Technology | Coding of acoustic waveforms |
| US5127054A (en) * | 1988-04-29 | 1992-06-30 | Motorola, Inc. | Speech quality improvement for voice coders and synthesizers |
| JPH02183630A (en) * | 1989-01-10 | 1990-07-18 | Fujitsu Ltd | Voice coding system |
| US5109417A (en) * | 1989-01-27 | 1992-04-28 | Dolby Laboratories Licensing Corporation | Low bit rate transform coder, decoder, and encoder/decoder for high-quality audio |
| US5054075A (en) * | 1989-09-05 | 1991-10-01 | Motorola, Inc. | Subband decoding method and apparatus |
| CN1062963C (en) * | 1990-04-12 | 2001-03-07 | 多尔拜实验特许公司 | Adaptive-block-lenght, adaptive-transform, and adaptive-window transform coder, decoder, and encoder/decoder for high-quality audio |
| KR100228688B1 (en) * | 1991-01-08 | 1999-11-01 | 쥬더 에드 에이. | Decoder for variable-number of channel presentation of multi-dimensional sound fields |
| JP3134337B2 (en) * | 1991-03-30 | 2001-02-13 | ソニー株式会社 | Digital signal encoding method |
| EP0551705A3 (en) * | 1992-01-15 | 1993-08-18 | Ericsson Ge Mobile Communications Inc. | Method for subbandcoding using synthetic filler signals for non transmitted subbands |
| JP2563719B2 (en) | 1992-03-11 | 1996-12-18 | 技術研究組合医療福祉機器研究所 | Audio processing equipment and hearing aids |
| JP2693893B2 (en) * | 1992-03-30 | 1997-12-24 | 松下電器産業株式会社 | Stereo speech coding method |
| JP3508146B2 (en) * | 1992-09-11 | 2004-03-22 | ソニー株式会社 | Digital signal encoding / decoding device, digital signal encoding device, and digital signal decoding device |
| JP3127600B2 (en) * | 1992-09-11 | 2001-01-29 | ソニー株式会社 | Digital signal decoding apparatus and method |
| US5402124A (en) * | 1992-11-25 | 1995-03-28 | Dolby Laboratories Licensing Corporation | Encoder and decoder with improved quantizer using reserved quantizer level for small amplitude signals |
| US5394466A (en) * | 1993-02-16 | 1995-02-28 | Keptel, Inc. | Combination telephone network interface and cable television apparatus and cable television module |
| US5623577A (en) * | 1993-07-16 | 1997-04-22 | Dolby Laboratories Licensing Corporation | Computationally efficient adaptive bit allocation for encoding method and apparatus with allowance for decoder spectral distortions |
| JPH07225598A (en) | 1993-09-22 | 1995-08-22 | Massachusetts Inst Of Technol <Mit> | Method and device for acoustic coding using dynamically determined critical band |
| JP3186489B2 (en) * | 1994-02-09 | 2001-07-11 | ソニー株式会社 | Digital signal processing method and apparatus |
| JP3277682B2 (en) * | 1994-04-22 | 2002-04-22 | ソニー株式会社 | Information encoding method and apparatus, information decoding method and apparatus, and information recording medium and information transmission method |
| US5758315A (en) * | 1994-05-25 | 1998-05-26 | Sony Corporation | Encoding/decoding method and apparatus using bit allocation as a function of scale factor |
| US5748786A (en) * | 1994-09-21 | 1998-05-05 | Ricoh Company, Ltd. | Apparatus for compression using reversible embedded wavelets |
| JP3254953B2 (en) | 1995-02-17 | 2002-02-12 | 日本ビクター株式会社 | Highly efficient speech coding system |
| DE19509149A1 (en) | 1995-03-14 | 1996-09-19 | Donald Dipl Ing Schulz | Audio signal coding for data compression factor |
| JPH08328599A (en) * | 1995-06-01 | 1996-12-13 | Mitsubishi Electric Corp | Mpeg audio decoder |
| DE69620967T2 (en) * | 1995-09-19 | 2002-11-07 | At & T Corp | Synthesis of speech signals in the absence of encoded parameters |
| US5692102A (en) * | 1995-10-26 | 1997-11-25 | Motorola, Inc. | Method device and system for an efficient noise injection process for low bitrate audio compression |
| US6138051A (en) * | 1996-01-23 | 2000-10-24 | Sarnoff Corporation | Method and apparatus for evaluating an audio decoder |
| JP3189660B2 (en) * | 1996-01-30 | 2001-07-16 | ソニー株式会社 | Signal encoding method |
| JP3519859B2 (en) * | 1996-03-26 | 2004-04-19 | 三菱電機株式会社 | Encoder and decoder |
| DE19628293C1 (en) * | 1996-07-12 | 1997-12-11 | Fraunhofer Ges Forschung | Encoding and decoding audio signals using intensity stereo and prediction |
| US6092041A (en) * | 1996-08-22 | 2000-07-18 | Motorola, Inc. | System and method of encoding and decoding a layered bitstream by re-applying psychoacoustic analysis in the decoder |
| JPH1091199A (en) * | 1996-09-18 | 1998-04-10 | Mitsubishi Electric Corp | Recording and reproducing device |
| US5924064A (en) * | 1996-10-07 | 1999-07-13 | Picturetel Corporation | Variable length coding using a plurality of region bit allocation patterns |
| EP0878790A1 (en) * | 1997-05-15 | 1998-11-18 | Hewlett-Packard Company | Voice coding system and method |
| JP3213582B2 (en) * | 1997-05-29 | 2001-10-02 | シャープ株式会社 | Image encoding device and image decoding device |
| SE512719C2 (en) | 1997-06-10 | 2000-05-02 | Lars Gustaf Liljeryd | A method and apparatus for reducing data flow based on harmonic bandwidth expansion |
| CN1144179C (en) * | 1997-07-11 | 2004-03-31 | 索尼株式会社 | Information decorder and decoding method, information encoder and encoding method and distribution medium |
| DE19730130C2 (en) * | 1997-07-14 | 2002-02-28 | Fraunhofer Ges Forschung | Method for coding an audio signal |
| AU3372199A (en) * | 1998-03-30 | 1999-10-18 | Voxware, Inc. | Low-complexity, low-delay, scalable and embedded speech and audio coding with adaptive frame loss concealment |
| US6115689A (en) * | 1998-05-27 | 2000-09-05 | Microsoft Corporation | Scalable audio coder and decoder |
| JP2000148191A (en) * | 1998-11-06 | 2000-05-26 | Matsushita Electric Ind Co Ltd | Coding device for digital audio signal |
| US6300888B1 (en) * | 1998-12-14 | 2001-10-09 | Microsoft Corporation | Entrophy code mode switching for frequency-domain audio coding |
| SE9903553D0 (en) * | 1999-01-27 | 1999-10-01 | Lars Liljeryd | Enhancing conceptual performance of SBR and related coding methods by adaptive noise addition (ANA) and noise substitution limiting (NSL) |
| US6363338B1 (en) * | 1999-04-12 | 2002-03-26 | Dolby Laboratories Licensing Corporation | Quantization in perceptual audio coders with compensation for synthesis filter noise spreading |
| WO2000063886A1 (en) * | 1999-04-16 | 2000-10-26 | Dolby Laboratories Licensing Corporation | Using gain-adaptive quantization and non-uniform symbol lengths for audio coding |
| FR2807897B1 (en) * | 2000-04-18 | 2003-07-18 | France Telecom | SPECTRAL ENRICHMENT METHOD AND DEVICE |
| JP2001324996A (en) * | 2000-05-15 | 2001-11-22 | Japan Music Agency Co Ltd | Method and device for reproducing mp3 music data |
| JP3616307B2 (en) * | 2000-05-22 | 2005-02-02 | 日本電信電話株式会社 | Voice / musical sound signal encoding method and recording medium storing program for executing the method |
| SE0001926D0 (en) | 2000-05-23 | 2000-05-23 | Lars Liljeryd | Improved spectral translation / folding in the subband domain |
| JP2001343998A (en) * | 2000-05-31 | 2001-12-14 | Yamaha Corp | Digital audio decoder |
| JP3538122B2 (en) | 2000-06-14 | 2004-06-14 | 株式会社ケンウッド | Frequency interpolation device, frequency interpolation method, and recording medium |
| SE0004187D0 (en) | 2000-11-15 | 2000-11-15 | Coding Technologies Sweden Ab | Enhancing the performance of coding systems that use high frequency reconstruction methods |
| GB0103245D0 (en) * | 2001-02-09 | 2001-03-28 | Radioscape Ltd | Method of inserting additional data into a compressed signal |
| US6963842B2 (en) * | 2001-09-05 | 2005-11-08 | Creative Technology Ltd. | Efficient system and method for converting between different transform-domain signal representations |
| US20030187663A1 (en) | 2002-03-28 | 2003-10-02 | Truman Michael Mead | Broadband frequency translation for high frequency regeneration |
| US7447631B2 (en) | 2002-06-17 | 2008-11-04 | Dolby Laboratories Licensing Corporation | Audio coding system using spectral hole filling |
-
2002
- 2002-06-17 US US10/174,493 patent/US7447631B2/en active Active
- 2002-09-06 US US10/238,047 patent/US7337118B2/en not_active Expired - Lifetime
-
2003
- 2003-04-29 TW TW092109991A patent/TWI352969B/en not_active IP Right Cessation
- 2003-05-30 DE DE60310716T patent/DE60310716T8/en active Active
- 2003-05-30 CA CA2736046A patent/CA2736046A1/en not_active Abandoned
- 2003-05-30 EP EP06020757A patent/EP1736966B1/en not_active Expired - Lifetime
- 2003-05-30 AT AT10162217T patent/ATE536615T1/en active
- 2003-05-30 DK DK03736761T patent/DK1514261T3/en active
- 2003-05-30 CA CA2736055A patent/CA2736055C/en not_active Expired - Lifetime
- 2003-05-30 KR KR1020047020570A patent/KR100991448B1/en active IP Right Grant
- 2003-05-30 EP EP10162216A patent/EP2209115B1/en not_active Expired - Lifetime
- 2003-05-30 SG SG2009049545A patent/SG177013A1/en unknown
- 2003-05-30 CN CNB038139677A patent/CN100369109C/en not_active Expired - Lifetime
- 2003-05-30 SG SG10201702049SA patent/SG10201702049SA/en unknown
- 2003-05-30 MX MXPA04012539A patent/MXPA04012539A/en active IP Right Grant
- 2003-05-30 JP JP2004514060A patent/JP4486496B2/en not_active Expired - Lifetime
- 2003-05-30 EP EP03736761A patent/EP1514261B1/en not_active Expired - Lifetime
- 2003-05-30 DK DK06020757.8T patent/DK1736966T3/en active
- 2003-05-30 DE DE60333316T patent/DE60333316D1/en not_active Expired - Lifetime
- 2003-05-30 AT AT03736761T patent/ATE349754T1/en active
- 2003-05-30 SI SI200332091T patent/SI2209115T1/en unknown
- 2003-05-30 PL PL372104A patent/PL208344B1/en unknown
- 2003-05-30 ES ES03736761T patent/ES2275098T3/en not_active Expired - Lifetime
- 2003-05-30 PT PT10162217T patent/PT2216777E/en unknown
- 2003-05-30 AT AT10162216T patent/ATE526661T1/en not_active IP Right Cessation
- 2003-05-30 KR KR1020107009429A patent/KR100991450B1/en active IP Right Grant
- 2003-05-30 AT AT06020757T patent/ATE473503T1/en not_active IP Right Cessation
- 2003-05-30 CA CA2489441A patent/CA2489441C/en not_active Expired - Lifetime
- 2003-05-30 EP EP10162217A patent/EP2216777B1/en not_active Expired - Lifetime
- 2003-05-30 WO PCT/US2003/017078 patent/WO2003107328A1/en active IP Right Grant
- 2003-05-30 SG SG2014005300A patent/SG2014005300A/en unknown
- 2003-05-30 CA CA2735830A patent/CA2735830C/en not_active Expired - Lifetime
- 2003-06-09 SI SI200332086T patent/SI2207169T1/en unknown
- 2003-06-09 KR KR1020107013899A patent/KR100986153B1/en active IP Right Grant
- 2003-06-09 AT AT10159810T patent/ATE529859T1/en not_active IP Right Cessation
- 2003-06-09 EP EP10159810A patent/EP2207170B1/en not_active Expired - Lifetime
- 2003-06-09 AT AT03760242T patent/ATE470220T1/en not_active IP Right Cessation
- 2003-06-09 KR KR1020107013897A patent/KR100986152B1/en active IP Right Grant
- 2003-06-09 CA CA2736065A patent/CA2736065C/en not_active Expired - Lifetime
- 2003-06-09 DK DK10159809.2T patent/DK2207169T3/en active
- 2003-06-09 CA CA2736060A patent/CA2736060C/en not_active Expired - Lifetime
- 2003-06-09 DE DE60332833T patent/DE60332833D1/en not_active Expired - Lifetime
- 2003-06-09 EP EP10159809A patent/EP2207169B1/en not_active Expired - Lifetime
- 2003-06-09 KR KR1020047020587A patent/KR100986150B1/en active IP Right Grant
- 2003-06-09 AT AT10159809T patent/ATE529858T1/en not_active IP Right Cessation
- 2003-06-16 MY MYPI20032238A patent/MY159022A/en unknown
- 2003-06-16 MY MYPI20032237A patent/MY136521A/en unknown
-
2004
- 2004-12-08 IL IL165650A patent/IL165650A/en active IP Right Grant
-
2005
- 2005-04-19 HK HK05103320A patent/HK1070729A1/en not_active IP Right Cessation
- 2005-04-19 HK HK05103319.3A patent/HK1070728A1/en not_active IP Right Cessation
-
2009
- 2009-02-04 US US12/365,783 patent/US8050933B2/en not_active Expired - Lifetime
- 2009-02-04 US US12/365,789 patent/US8032387B2/en not_active Expired - Lifetime
-
2010
- 2010-02-15 JP JP2010030139A patent/JP5063717B2/en not_active Expired - Lifetime
- 2010-08-19 HK HK10107912.8A patent/HK1141623A1/en not_active IP Right Cessation
- 2010-08-19 HK HK10107913.7A patent/HK1141624A1/en not_active IP Right Cessation
-
2011
- 2011-01-13 HK HK11100292.2A patent/HK1146145A1/en not_active IP Right Cessation
- 2011-01-13 HK HK11100293.1A patent/HK1146146A1/en not_active IP Right Cessation
- 2011-10-31 IL IL216069A patent/IL216069A/en active IP Right Grant
- 2011-12-28 JP JP2011287051A patent/JP5253564B2/en not_active Expired - Lifetime
- 2011-12-28 JP JP2011287052A patent/JP5253565B2/en not_active Expired - Lifetime
-
2012
- 2012-07-03 JP JP2012149087A patent/JP5345722B2/en not_active Expired - Lifetime
-
2013
- 2013-07-12 JP JP2013146451A patent/JP5705273B2/en not_active Expired - Lifetime
Also Published As
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2489441A1 (en) | Audio coding system using spectral hole filling | |
| US9754601B2 (en) | Information signal encoding using a forward-adaptive prediction and a backwards-adaptive quantization | |
| US7613603B2 (en) | Audio coding device with fast algorithm for determining quantization step sizes based on psycho-acoustic model | |
| CA2284220C (en) | Method for signalling a noise substitution during audio signal coding | |
| JP5539203B2 (en) | Improved transform coding of speech and audio signals | |
| DK0709005T3 (en) | Method and apparatus for computational, efficient, adaptive bit allocation for coding. | |
| US20080140405A1 (en) | Audio coding system using characteristics of a decoded signal to adapt synthesized spectral components | |
| DK0709004T3 (en) | Hybrid adaptive allocation for audio and decoder | |
| KR100472442B1 (en) | Method for compressing audio signal using wavelet packet transform and apparatus thereof | |
| US7349842B2 (en) | Rate-distortion control scheme in audio encoding | |
| SG66294A1 (en) | Computationally efficient adaptive bit allocation for encoding method and apparatus with allowance for decoder spectral distortions | |
| US7343292B2 (en) | Audio encoder utilizing bandwidth-limiting processing based on code amount characteristics | |
| CA2169999A1 (en) | Wide-Band Signal Encoder | |
| KR970006825B1 (en) | Audio signal encoding apparatus | |
| DE10119980C1 (en) | Audio data coding method uses maximum permissible error level for each frequency band and signal power of audio data for determining quantisation resolution | |
| KR20080008897A (en) | Method for audio signal coding | |
| KR970006827B1 (en) | Audio signal encoding apparatus | |
| JPH09507631A (en) | Transmission system using differential coding principle | |
| KR950034203A (en) | Bit Allocation Method and Circuit for Multichannel Digital Audio |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |
Effective date: 20150129 |