WO2009042386A4 - Apparatus and method for encoding a multi channel audio signal - Google Patents

Apparatus and method for encoding a multi channel audio signal Download PDF

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Publication number
WO2009042386A4
WO2009042386A4 PCT/US2008/075703 US2008075703W WO2009042386A4 WO 2009042386 A4 WO2009042386 A4 WO 2009042386A4 US 2008075703 W US2008075703 W US 2008075703W WO 2009042386 A4 WO2009042386 A4 WO 2009042386A4
Authority
WO
WIPO (PCT)
Prior art keywords
audio signal
time difference
multi channel
signal
channel audio
Prior art date
Application number
PCT/US2008/075703
Other languages
French (fr)
Other versions
WO2009042386A1 (en
Inventor
Jonathan Alastair Gibbs
Original Assignee
Motorola Inc
Jonathan Alastair Gibbs
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to KR1020107006423A priority Critical patent/KR101120913B1/en
Application filed by Motorola Inc, Jonathan Alastair Gibbs filed Critical Motorola Inc
Priority to BRPI0817982A priority patent/BRPI0817982B1/en
Priority to US12/679,121 priority patent/US8577045B2/en
Priority to JP2010527010A priority patent/JP5277508B2/en
Priority to MX2010002846A priority patent/MX2010002846A/en
Priority to CN2008801087221A priority patent/CN101809655B/en
Priority to CA2698600A priority patent/CA2698600C/en
Priority to EP08799366.3A priority patent/EP2206110B1/en
Publication of WO2009042386A1 publication Critical patent/WO2009042386A1/en
Publication of WO2009042386A4 publication Critical patent/WO2009042386A4/en
Priority to ZA2010/01672A priority patent/ZA201001672B/en
Priority to US13/920,549 priority patent/US9570080B2/en
Priority to US15/398,364 priority patent/US20170116997A1/en

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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
    • G10L19/04—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 predictive techniques
    • G10L19/08—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters
    • G10L19/12—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters the excitation function being a code excitation, e.g. in code excited linear prediction [CELP] 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
    • 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
    • G10L19/008—Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R27/00—Public address systems
    • 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
    • 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
    • G10L19/04—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 predictive techniques
    • G10L19/06—Determination or coding of the spectral characteristics, e.g. of the short-term prediction coefficients
    • 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
    • G10L19/04—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 predictive techniques
    • G10L19/08—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters
    • G10L19/087—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters using mixed excitation models, e.g. MELP, MBE, split band LPC or HVXC
    • 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
    • G10L19/04—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 predictive techniques
    • G10L19/16—Vocoder architecture
    • G10L19/18—Vocoders using multiple modes
    • G10L19/24—Variable rate codecs, e.g. for generating different qualities using a scalable representation such as hierarchical encoding or layered encoding
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
    • G10L25/03—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters
    • G10L25/06—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters the extracted parameters being correlation coefficients
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
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    • G10L25/03—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters
    • G10L25/12—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters the extracted parameters being prediction coefficients
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
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    • G10L25/03—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters
    • G10L25/18—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters the extracted parameters being spectral information of each sub-band
    • G—PHYSICS
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    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
    • G10L25/03—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters
    • G10L25/21—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters the extracted parameters being power information
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
    • G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
    • G10L25/03—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters
    • G10L25/24—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 characterised by the type of extracted parameters the extracted parameters being the cepstrum
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M3/00—Conversion of analogue values to or from differential modulation
    • H03M3/30—Delta-sigma modulation
    • H03M3/458—Analogue/digital converters using delta-sigma modulation as an intermediate step
    • H03M3/466—Multiplexed conversion systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S2400/00—Details of stereophonic systems covered by H04S but not provided for in its groups
    • H04S2400/01—Multi-channel, i.e. more than two input channels, sound reproduction with two speakers wherein the multi-channel information is substantially preserved
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S2420/00—Techniques used stereophonic systems covered by H04S but not provided for in its groups
    • H04S2420/03—Application of parametric coding in stereophonic audio systems

Abstract

An encoding apparatus comprises a frame processor (105) which receives a multi channel audio signal comprising at least a first audio signal from a first microphone (101) and a second audio signal from a second microphone (103). An ITD processor (107) then determines an inter time difference between the first audio signal and the second audio signal and a set of delays (109, 111) generates a compensated multi channel audio signal from the multi channel audio signal by delaying at least one of the first and second audio signals in response to the inter time difference signal. A combiner (113) then generates a mono signal by combining channels of the compensated multi channel audio signal and a mono signal encoder (115) encodes the mono signal. The inter time difference may specifically be determined by an algorithm based on determining cross correlations between the first and second audio signals.

Claims

AMENDED CLAIMSReceived by the International Bureau on 28 April 2009 (28.04.09)
1. An apparatus for encoding a multi channel audio signal, the apparatus comprising: a receiver for receiving the multi channel audio signal comprising at least a first audio signal from a first microphone and a second audio signal from a second microphone ; a time difference unit for determining an inter time difference between the first audio signal and the second audio signal by combining successive observations of cross - correlations between the first audio signal and the second audio signal and where the cross-correlations are processed to derive probabilities that are accumulated using a Viterbi-like algorithm; a delay unit for generating a compensated multi channel audio signal from the multi channel audio signal by delaying at least one of the first audio signal and the second audio signal in response to the inter time difference signal; a mono unit for generating a mono signal by combining channels of the compensated multi channel audio signal; and a mono signal encoder for encoding the mono signal.
2. The apparatus of claim 1 wherein the time difference unit is arranged to determine cross correlations between the first audio signal and the second audio signal for a plurality of time offsets, and to determine the inter time difference in response to the cross correlations.
3. The apparatus of claim 2 wherein the time difference unit is arranged to low pass filter the first audio signal and the second audio signal prior to the cross correlation.
29
4. The apparatus of claim 2 wherein the time difference unit is arranged to decimate the first audio signal and the second audio signal prior to the cross correlation.
5. The apparatus of claim 2 wherein the delay unit is arranged to compensate the inter time difference for a decimation factor of the decimation in order to determine a delay for at least one of the first audio signal and the second audio signal.
6. The apparatus of claim 2 wherein the time difference unit is arranged to apply a spectral whitening to the first audio signal and the second audio signal prior to the correlation.
7. The apparatus of claim 2 wherein the time difference unit is arranged to perform windowing of the first audio signal and the second audio signal prior to the cross correlation.
8. The apparatus of claim 2 wherein the time difference unit comprises : a trellis state machine having a plurality of states, each of the plurality of states corresponding to a time offset of the plurality of time offsets; a path unit for determining path metrics for states of the trellis state machine in response to the cross correlations; a computational unit for determining state metrics for the states in response to path metrics associated with paths from previous states to current states; and
30 a unit for determining the inter> time difference in response to the state metrics.
9. The apparatus of claim 1 wherein the delay unit is arranged to transition from a first delay to a second delay by generating a first compensated πvulti channel audio signal in response to the first delay and a second compensated πvulti channel audio signal in response to the second delay and to combine the first compensated multi channel audio signal and second compensated multi channel audio signal to generate the compensated multi channel audio signal.
10. A method of encoding a multi channel audio signal, the method comprising: receiving the multi channel audio signal comprising at least a first audio signal from a first microphone and a second audio signal from a second microphone; determining an inter time difference between the first audio signal and the second audio signal; generating a compensated multi channel audio signal from the multi channel audio signal by delaying at least one of the first audio signal and the second audio signal in response to the inter time difference signal; generating a mono signal by combining channels of the compensated multi channel audio signal; and encoding the mono signal in a mono signal encoder.
PCT/US2008/075703 2007-09-25 2008-09-09 Apparatus and method for encoding a multi channel audio signal WO2009042386A1 (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
CN2008801087221A CN101809655B (en) 2007-09-25 2008-09-09 Apparatus and method for encoding a multi channel audio signal
BRPI0817982A BRPI0817982B1 (en) 2007-09-25 2008-09-09 apparatus and method for encoding a multichannel audio signal
US12/679,121 US8577045B2 (en) 2007-09-25 2008-09-09 Apparatus and method for encoding a multi-channel audio signal
JP2010527010A JP5277508B2 (en) 2007-09-25 2008-09-09 Apparatus and method for encoding a multi-channel acoustic signal
MX2010002846A MX2010002846A (en) 2007-09-25 2008-09-09 Apparatus and method for encoding a multi channel audio signal.
KR1020107006423A KR101120913B1 (en) 2007-09-25 2008-09-09 Apparatus and method for encoding a multi channel audio signal
CA2698600A CA2698600C (en) 2007-09-25 2008-09-09 Apparatus and method for encoding a multi channel audio signal
EP08799366.3A EP2206110B1 (en) 2007-09-25 2008-09-09 Apparatus and method for encoding a multi channel audio signal
ZA2010/01672A ZA201001672B (en) 2007-09-25 2010-03-08 Apparatus and method for encoding a multi channel audio signal
US13/920,549 US9570080B2 (en) 2007-09-25 2013-06-18 Apparatus and method for encoding a multi-channel audio signal
US15/398,364 US20170116997A1 (en) 2007-09-25 2017-01-04 Apparatus and method for encoding a multi channel audio signal

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0718682.8 2007-09-25
GB0718682.8A GB2453117B (en) 2007-09-25 2007-09-25 Apparatus and method for encoding a multi channel audio signal

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US12/679,121 A-371-Of-International US8577045B2 (en) 2007-09-25 2008-09-09 Apparatus and method for encoding a multi-channel audio signal
US13/920,549 Continuation US9570080B2 (en) 2007-09-25 2013-06-18 Apparatus and method for encoding a multi-channel audio signal

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WO2009042386A1 WO2009042386A1 (en) 2009-04-02
WO2009042386A4 true WO2009042386A4 (en) 2009-06-25

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US (3) US8577045B2 (en)
EP (1) EP2206110B1 (en)
JP (1) JP5277508B2 (en)
KR (1) KR101120913B1 (en)
CN (1) CN101809655B (en)
BR (1) BRPI0817982B1 (en)
CA (1) CA2698600C (en)
GB (1) GB2453117B (en)
MX (1) MX2010002846A (en)
MY (1) MY169423A (en)
RU (1) RU2450369C2 (en)
WO (1) WO2009042386A1 (en)
ZA (1) ZA201001672B (en)

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