CA2736065A1 - Audio coding system using characteristics of a decoded signal to adapt synthesized spectral components - Google Patents

Audio coding system using characteristics of a decoded signal to adapt synthesized spectral components Download PDF

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Publication number
CA2736065A1
CA2736065A1 CA2736065A CA2736065A CA2736065A1 CA 2736065 A1 CA2736065 A1 CA 2736065A1 CA 2736065 A CA2736065 A CA 2736065A CA 2736065 A CA2736065 A CA 2736065A CA 2736065 A1 CA2736065 A1 CA 2736065A1
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Prior art keywords
subband signals
spectral components
components
synthesized
medium
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CA2736065A
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French (fr)
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CA2736065C (en
Inventor
Grant Allen Davidson
Michael Mead Truman
Matthew Conrad Fellers
Mark Stuart Vinton
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Dolby Laboratories Licensing Corp
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Dolby Laboratories Licensing Corp
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    • 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

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  • 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

A receiver in an audio coding system receives a signal conveying frequency subband signals representing an audio signal. The subband signals are examined to assess one or more characteristics of the audio signal. Spectral components are synthesized having the assessed characteristics. The synthesized spectral components are integrated with the subband signals and passed through a synthesis filterbank to generate an output signal. In one implementation, the assessed characteristic is temporal shape and noise-like spectral components are synthesized having the temporal shape of the audio signal.

Claims (30)

1. A. method for processing encoded audio information, wherein the method comprises:
receiving the encoded audio information and obtaining therefrom subband signals representing some but not all spectral content of an audio signal;
examining the subband signals to obtain a characteristic of the audio signal;
generating synthesized spectral components that have the characteristic of the audio signal;
integrating the synthesized spectral components with the subband signals to generate a set of modified subband signals; and generating the audio information by applying a synthesis filterbank to the set of modified subband signals.
2. The method of claim 1, wherein the characteristic is temporal shape and the method generates the synthesized spectral components to have the temporal shape by generating spectral components and convolving the generated spectral components with a frequency-domain representation of the temporal shape.
3. The method of claim 1 that obtains the temporal shape by calculating an autocorrelation function of at least some components of the subband signals.
4. The method of claim 1, wherein the characteristic is temporal shape and the method generates the synthesized spectral components to have the temporal shape by generating spectral components and applying a filter to at least some of the generated spectral components.
5. The method of claim 4 that obtains control information from the encoded information and adapts the filter in response to the control information.
6. The method of claim 1 that generates the set of modified subband signals by merging the synthesized spectral components with components of the subband signals.
7. The method of claim 1 that generates the set of modified subband signals by combining the synthesized spectral components with respective components of the subband signals
8. The method of claim 1 that generates the set of modified subband signals by substituting the synthesized spectral components for respective components of the subband signals.
9. The method of claim 1 that obtains the characteristics of the audio signal by examining components of one or more subband signals in a first portion of spectrum;
generates the synthesized spectral components by copying one or more components of the subband signals in the first portion of spectrum to a second portion of spectrum to form synthesized subband signals and modifying the copied components such that the synthesized subband signals have the charactersitic of the audio signal; and integrates the synthesized spectral components with the subband signals by combining the synthesized subband signals with the subband signals.
10. The method of claim 1, wherein the characteristic is any one from the set of amplitude, spectral shape, psychacoustic masking effects, tonality and temporal shape.
11. A medium that is readable by a device and that conveys a program of instructions executable by the device to perform a method for processing encoded audio information, wherein the method comprises steps performing the acts of:

receiving the encoded audio information and obtaining therefrom subband signals representing some but not all spectral content of an audio signal;
examining the subband signals to obtain a characteristic of the audio signal;
generating synthesized spectral components that have the characteristic of the audio signal;
integrating the synthesized spectral components with the subband signals to generate a set of modified subband signals; and generating the audio information by applying a synthesis filterbank to the set of modified subband signals.
12. The medium of claim 11, wherein the characteristic is temporal shape and the method generates the synthesized spectral components to have the temporal shape by generating spectral components and convolving the generated spectral components with a frequency-domain representation of the temporal shape.
13. The medium of claim 11, wherein the method obtains the temporal shape by calculating an autocorrelation function of at least some components of the subband signals.
14. The medium of claim 11, wherein the characteristic is temporal shape and the method generates the synthesized spectral components to have the temporal shape by generating spectral components and applying a filter to at least some of the generated spectral components.
15. The medium of claim 14, wherein the method obtains control information from the encoded information and adapts the filter in response to the control information.
16. The medium of claim 11, wherein the method generates the set of modified subband signals by merging the synthesized spectral components with components of the subband signals.
17. The medium of claim 11, wherein the method generates the set of modified subband signals by combining the synthesized spectral components with respective components of the subband signals.
18. The medium of claim 11, wherein the method generates the set of modified subband signals by substituting the synthesized spectral components for respective components of the subband signals.
19. The medium of claim 11, wherein the method.
obtains the characteristics of the audio signal by examining components of one or more subband signals in a first portion of spectrum;
generates the synthesized spectral components by copying one or more components of the subband signals in the first portion of spectrum to a second portion of spectrum to form synthesized subband signals and modifying the copied components such that the synthesized subband signals have the charactersitic of the audio signal; and integrates the synthesized spectral components with the subband signals by combining the synthesized subband signals with the subband signals.
20. The medium of claim 11, wherein the characteristic is any one from the set of amplitude, spectral shape, psychacoustic masking effects, tonality and temporal shape.
21. An apparatus for processing encoded audio information, wherein the apparatus comprises:
an input terminal that receives the encoded audio information;
memory; and processing circuitry coupled to the input terminal and the memory, wherein the processing circuitry is adapted to:

receive the encoded audio information and obtain therefrom subband signals representing some but not all spectral content of an audio signal;
examine the subband signals to obtain a characteristic of the audio signal;
generate synthesized spectral components that have the characteristic of the audio signal;
integrate the synthesized spectral components with the subband signals to generate a set of modified subband signals; and generate the audio information by applying a synthesis filterbank to the set of modified subband signals
22. The medium of claim 21, wherein the characteristic is temporal shape and the processing circuitry is adpated to generate the synthesized spectral components to have the temporal shape by generating spectral components and convolving the generated spectral components with a frequency-domain representation of the temporal shape.
23. The medium of claim 21, wherein the processing circuitry is adpated to obtain the temporal shape by calculating an autocorrelation function of at least some components of the subband signals.
24. The medium of claim 21, wherein the characteristic is temporal shape and the processing circuitry is adpated to generate the synthesized spectral components to have the temporal shape by generating spectral components and applying a filter to at least some of the generated spectral components.
25. The medium of claim 24, wherein the processing circuitry is adpated to obtain control information from the encoded information and adapt the filter in response to the control information.
26. The medium of claim 21, wherein the processing circuitry is adpated to generate the set of modified subband signals by merging the synthesized spectral components with components of the subband signals.
27. The medium of claim 21, wherein the processing circuitry is adpated to generate the set of modified subband signals by combining the synthesized spectral components with respective components of the subband signals.
28. The medium of claim 21, wherein the processing circuitry is adpated to generate the set of modified subband signals by substituting the synthesized spectral components for respective components of the subband signals
29. The medium of claim 21, wherein the processing circuitry is adpated to:
obtain the characteristics of the audio signal by examining components of one or more subband signals in a first portion of spectrum, generate the synthesized spectral components by copying one or more components of the subband signals in the first portion of spectrum to a second portion of spectrum to form synthesized subband signals and modifying the copied components such that the synthesized subband signals have the charactersitic of the audio signal; and integrate the synthesized spectral components with the subband signals by combining the synthesized subband signals with the subband signals.
30. The medium of claim 21, wherein the characteristic is any one from the set of amplitude, spectral shape, psychacoustic masking effects, tonality and temporal shape.
CA2736065A 2002-06-17 2003-06-09 Audio coding system using characteristics of a decoded signal to adapt synthesized spectral components Expired - Lifetime CA2736065C (en)

Applications Claiming Priority (5)

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
US10/238,047 US7337118B2 (en) 2002-06-17 2002-09-06 Audio coding system using characteristics of a decoded signal to adapt synthesized spectral components
US10/238,047 2002-09-06
CA2489443A CA2489443C (en) 2002-06-17 2003-06-09 Audio coding system using characteristics of a decoded signal to adapt synthesized spectral components

Related Parent Applications (1)

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CA2489443A Division CA2489443C (en) 2002-06-17 2003-06-09 Audio coding system using characteristics of a decoded signal to adapt synthesized spectral components

Publications (2)

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CA2736065A1 true CA2736065A1 (en) 2003-12-24
CA2736065C CA2736065C (en) 2015-02-10

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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

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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
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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)
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PL (1) PL208344B1 (en)
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SG (3) SG177013A1 (en)
SI (2) SI2209115T1 (en)
TW (1) TWI352969B (en)
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