CA2626132A1 - Removing time delays in signal paths - Google Patents

Removing time delays in signal paths Download PDF

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Publication number
CA2626132A1
CA2626132A1 CA002626132A CA2626132A CA2626132A1 CA 2626132 A1 CA2626132 A1 CA 2626132A1 CA 002626132 A CA002626132 A CA 002626132A CA 2626132 A CA2626132 A CA 2626132A CA 2626132 A1 CA2626132 A1 CA 2626132A1
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Prior art keywords
downmix signal
time
spatial information
signal
domain
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Granted
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CA002626132A
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French (fr)
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CA2626132C (en
Inventor
Hee Suck Pang
Dong Soo Kim
Jae Hyun Lim
Hyen O. Oh
Yang Won Jung
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LG Electronics Inc
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Individual
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Priority claimed from KR1020060078223A external-priority patent/KR20070037986A/en
Priority claimed from KR1020060078219A external-priority patent/KR20070074442A/en
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Publication of CA2626132A1 publication Critical patent/CA2626132A1/en
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    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00Speech 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
    • G10L19/008Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00Processing 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
    • G10L21/02Speech enhancement, e.g. noise reduction or echo cancellation
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03MCODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
    • H03M7/30Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04SSTEREOPHONIC SYSTEMS 
    • H04S5/00Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation 
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00Speech 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
    • G10L19/04Speech 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 predictive techniques
    • G10L19/16Vocoder architecture
    • G10L19/167Audio streaming, i.e. formatting and decoding of an encoded audio signal representation into a data stream for transmission or storage purposes
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10LSPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00Speech 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
    • G10L19/04Speech 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 predictive techniques
    • G10L19/16Vocoder architecture
    • G10L19/18Vocoders using multiple modes
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04SSTEREOPHONIC SYSTEMS 
    • H04S7/00Indicating arrangements; Control arrangements, e.g. balance control
    • H04S7/30Control circuits for electronic adaptation of the sound field

Abstract

The disclosed embodiments include systems, methods, apparatuses, and computer-readable mediums for compensating one or more signals and/or one or more parameters for time delays in one or more signal processing paths.

Claims (27)

1. A method of processing an audio signal, comprising:

receiving an audio signal including a downmix signal and spatial information;

converting the downmix signal from a first domain to a second domain to provide a first converted downmix signal;

converting the first converted downmix signal from the second domain to a third domain to provide a second -converted downmix signal; and combining the second converted downmix signal and the spatial information, wherein the combined spatial information is delayed by an amount of time that includes an elapsed time of the converting.
2. The method of claim 1, wherein receiving an audio signal further comprises:

receiving spatial information that has been compensated for at least a portion of the time delay.
3. The method of claim 1, wherein the first converting steps further comprises:

converting the downmix signal from a time domain to a frequency domain.
4. The method of claims 3, wherein the frequency domain includes a QMF domain.
5. The method of claim 1, wherein the second converting step further comprises:

converting the first converted downmix signal from a Quadrature Mirror Filter (QMF) real signal to a QMF complex signal.
6. The method of claim 1, wherein the second converting step further comprises:

converting the first converted downmix signal from a Quadrature Mirror Filter (QMF) complex signal to a real QMF
signal.
7. A method of processing an audio signal, comprising:

receiving an audio signal of which time synchronization between a downmix signal and spatial information is matched according to a first decoding scheme;

decoding the downmix signal to provide a decoded downmix signal in one of at least two downmix input domains; and compensating for a time synchronization difference between the received downmix signal and the spatial information if the decoding is performed according to a second decoding scheme using the received downmix signal and the spatial information.
8. The method of claim 7, wherein in the time synchronization difference compensating, at least one of the received downmix signal and the spatial information is led or lagged and a total leading or lagging time corresponds to the time synchronization difference.
9. The method of claim 8, wherein the downmix input domains include a time domain and a Quadrature Mirror Filter (QMF) domain.
10. The method of claim 9, wherein the time synchronization difference is a total of a first time synchronization difference associated with the decoding and a second time synchronization difference associated with other processing.
11. The method of claim 10, wherein the second time synchronization difference is a difference between a first delay time occurring until a time point of combining the downmix signal and the spatial information in accordance with the first decoding scheme, and a second delay time occurring until a time point of combining the downmix signal and the spatial information in accordance with the second decoding scheme.
12-.- The method of claim 8, wherein each of the first and second decoding schemes corresponds to one of a decoding scheme based on power and a decoding scheme based on audio quality, and the first and second decoding schemes are different from each other.
13. The method of claim 12, wherein in the time synchronization difference compensating, the received downmix signal is delayed by an amount of time including a first elapsed time associated with a complexity domain conversion and the spatial information is delayed by an amount of time including a second elapsed time associated with a time domain to frequency domain conversion, if the first decoding scheme is based on power and the second decoding scheme is based on quality.
14. The method of claim 13, further comprising:
generating a plural-channel signal using the compensated downmix signal and spatial information; and compensating for a time synchronization difference between the plural-channel signal and a time-series data.
15. The method of claim 14, wherein the time-series data includes at least one of a moving picture, a still image and text.
16. A system for processing an audio signal, comprising:

a first decoder configured for receiving an audio signal of which time synchronization between a downmix signal and spatial information is matched according to a first decoding scheme, and for decoding the downmix signal;
and a second decoder operatively coupled to the first decoder and configured for:

receiving the decoded downmix signal in one of at least two downmix input domains; and compensating for a time synchronization difference between the received downmix signal and the spatial information, if the decoding is performed according to a second decoding scheme using the received downmix signal and the spatial information.
17. The system of claim 16, wherein in the time synchronization difference compensating, at least one of the received downmix signal and the spatial information is led or lagged and a total leading or lagging time corresponds to the time synchronization difference.
18. The method of claim 17, wherein the downmix input domains include a time domain and a Quadrature Mirror Filter (QMF) domain.
19. The system of claim 18, wherein the time synchronization difference is a total of a first time synchronization difference associated with the decoding and a second time synchronization difference associated with other processing.
20. The system of claim 19, wherein the second time synchronization difference is a difference between a first delay time occurring until a time point of combining the downmix signal and the spatial information in accordance with the first decoding scheme, and a second delay time occurring until a time point of combining the downmix signal and the spatial information in accordance with the second decoding scheme.
21. The system of claim 16, wherein each of the first and second decoding schemes corresponds to one of a decoding scheme based on power and a decoding scheme based on audio quality, and the first and second decoding schemes are different from each other.
22. The system of claim 21, wherein in the time synchronization difference compensating, the received downmix signal is delayed by an amount of time including a first elapsed time associated with a complexity domain conversion and the spatial information is delayed by an amount of time including a second elapsed time associated with a time domain to frequency domain conversion, if the first decoding scheme is based on power and the second decoding scheme is based on quality.
23. The system of claim 22, further comprising:
generating a plural-channel signal using the compensated downmix signal and spatial information; and compensating for a time synchronization difference between the plural-channel signal and a time-series data.
24. The system of claim 23, wherein the time-series data includes at least one of a moving picture, a still image and text.
25. A computer-readable medium having instructions stored thereon, which, when executed by a processor causes the processor to perform the operations of:

receiving an audio signal including a downmix signal and spatial information;

converting the downmix signal from a first domain to a second domain to provide a first converted downmix signal;

converting the first converted downmix signal from the second domain to a third domain to provide a second converted downmix signal;

compensating the second converted downmix signal for a time delay resulting from the converting; and combining the second converted downmix signal and the spatial information.
26. A computer-readable medium having instructions stored thereon, which, when executed by a processor causes the processor to perform the operations of:

receiving an audio signal of which time synchronization between a downmix signal and spatial information is matched according to a first decoding scheme;

decoding the downmix signal to provide a decoded downmix signal in one of at least two downmix input domains; and compensating for a time synchronization difference between the received downmix signal and the spatial information if the decoding is performed according to a second decoding scheme using the received downmix signal and the spatial information.
27. A method of processing an audio signal, comprising:

receiving an audio signal including a downmix signal and spatial information;

converting the downmix signal from a first domain to a second domain to provide a first converted downmix signal;

converting the first converted downmix signal from the second domain to a third domain to provide a second converted downmix signal;

compensating the second converted downmix signal for a time delay resulting from the converting; and combining the second converted downmix signal and the spatial information.
CA2626132A 2005-10-24 2006-10-02 Removing time delays in signal paths Active CA2626132C (en)

Applications Claiming Priority (21)

Application Number Priority Date Filing Date Title
US72922505P 2005-10-24 2005-10-24
US60/729,225 2005-10-24
US75700506P 2006-01-09 2006-01-09
US60/757,005 2006-01-09
US78674006P 2006-03-29 2006-03-29
US60/786,740 2006-03-29
US79232906P 2006-04-17 2006-04-17
US60/792,329 2006-04-17
KR10-2006-0078218 2006-08-18
KR1020060078223A KR20070037986A (en) 2005-10-04 2006-08-18 Method and apparatus method for processing multi-channel audio signal
KR1020060078218A KR20070037983A (en) 2005-10-04 2006-08-18 Method for decoding multi-channel audio signals and method for generating encoded audio signal
KR10-2006-0078223 2006-08-18
KR1020060078225A KR20070037987A (en) 2005-10-04 2006-08-18 Method and apparatus for decoding multi-channel audio signal
KR10-2006-0078221 2006-08-18
KR1020060078221A KR20070037984A (en) 2005-10-04 2006-08-18 Method and apparatus for decoding multi-channel audio signals
KR1020060078219A KR20070074442A (en) 2006-01-09 2006-08-18 Apparatus and method for recovering multi-channel audio signal, and computer-readable medium storing a program performed in the apparatus
KR1020060078222A KR20070037985A (en) 2005-10-04 2006-08-18 Method and apparatus method for decoding multi-channel audio signals
KR10-2006-0078225 2006-08-18
KR10-2006-0078219 2006-08-18
KR10-2006-0078222 2006-08-18
PCT/KR2006/003973 WO2007049862A1 (en) 2005-10-24 2006-10-02 Removing time delays in signal paths

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CA2626132A1 true CA2626132A1 (en) 2007-05-03
CA2626132C CA2626132C (en) 2012-08-28

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US (8) US20070092086A1 (en)
EP (6) EP1952670A4 (en)
JP (6) JP2009513084A (en)
KR (7) KR101186611B1 (en)
CN (6) CN101297596B (en)
AU (1) AU2006306942B2 (en)
BR (1) BRPI0617779A2 (en)
CA (1) CA2626132C (en)
HK (1) HK1126071A1 (en)
TW (6) TWI317245B (en)
WO (6) WO2007049865A1 (en)

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