WO2007032650A1 - Method and apparatus for decoding an audio signal - Google Patents

Method and apparatus for decoding an audio signal Download PDF

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Publication number
WO2007032650A1
WO2007032650A1 PCT/KR2006/003666 KR2006003666W WO2007032650A1 WO 2007032650 A1 WO2007032650 A1 WO 2007032650A1 KR 2006003666 W KR2006003666 W KR 2006003666W WO 2007032650 A1 WO2007032650 A1 WO 2007032650A1
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WO
WIPO (PCT)
Prior art keywords
channel
spatial information
audio signal
formula
spatial
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.)
Ceased
Application number
PCT/KR2006/003666
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English (en)
French (fr)
Inventor
Hee Suck Pang
Hyen O Oh
Jae Hyun Lim
Dong Soo Kim
Yang Won Jung
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
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 CN2006800420618A priority Critical patent/CN101351839B/zh
Priority to EP06783786.4A priority patent/EP1946295B1/en
Priority to HK09104644.3A priority patent/HK1126306B/xx
Priority to BRPI0616057-3A priority patent/BRPI0616057A2/pt
Priority to CA2621664A priority patent/CA2621664C/en
Priority to AU2006291689A priority patent/AU2006291689B2/en
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Priority to US12/066,651 priority patent/US20080228501A1/en
Priority to JP2008531018A priority patent/JP2009508176A/ja
Publication of WO2007032650A1 publication Critical patent/WO2007032650A1/en
Anticipated expiration legal-status Critical
Priority to US13/088,947 priority patent/US20110196687A1/en
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; 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
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S3/00—Systems employing more than two channels, e.g. quadraphonic
    • H04S3/02—Systems employing more than two channels, e.g. quadraphonic of the matrix type, i.e. in which input signals are combined algebraically, e.g. after having been phase shifted with respect to each other

Definitions

  • FIG. 10 is a diagram of an example of configuring extended channels based on extended channel configuration information
  • the present invention generates modified spatial information using spatial information and then decodes an audio signal using the generated modified spatial information.
  • the spatial information is spatial information extracted in the course of downmixing according to a predetermined tree configuration and the modified spatial information is spatial information newly generated using spatial information.
  • the downmixing unit 110 of the encoding apparatus 100 generates a downmix audio signal d by downmixing a multichannel audio signal IN_M.
  • the downmix audio signal d can be a signal generated from downmixing the multi-channel audio signal IN__M by the downmixing unit 110 or an arbitrary downmix audio signal generated from downmixing the multi-channel audio signal IN M arbitrarily by a user.
  • a sequence of downmixing a multi-channel audio signal having a channel number 6 left front channel L, left surround channel L 3 , center channel C, low frequency channel LFE, right front channel R, right surround channel R 3 ) into stereo downmixed channels L 0 and R 0 and the relation between the multi- channel audio signal and spatial parameters are shown.
  • Pc/2 + PLFE/2 [ (C!,o ⁇ 4) 2 + (c 2/ o ⁇ 4) 2 ] * (C 2 , o ⁇ i*Ci, OTTO) 2 * m 2 /2,
  • L 0 L*G L _ ! + C*G c _i + R*G R _i + Ls*G Ls _ ! + Rs*G Rs _ !
  • R 0 L*G L _ r + C*G c _ r + R*G R ⁇ r + Ls*G Ls ⁇ r + Rs*G Rs _ r , where L, C, R, Ls and Rs are channels at positions, respectively, G x y indicates a sound path from a position x to a position y, and ⁇ *' indicates a convolution.
  • the signals arriving at the left and right ears 1 and r of the listener are equal to components of Formula 33 and Formula 34, even if they are outputted via the seakers of any position (e.g., via the speaker SPKl at the left front position) , the listener is able to sense as if speakers exist at the left and right surruond positions Ls and Rs, respectively.
  • components shown in Formula 33 are outputted from the speaker at the left surround position Ls, they are the signals arriving at the left and right ears 1 and r of the listener, respectively. So, if the components shown in Formula 33 are outputted intact from the speaker SPKl at the left front position, signals arriving at the left and right ears 1 and r of the listener can be represented as follows. [Formula 35] ⁇ Ls*G Ls _i*G L _i / , ⁇ Ls*G Ls _ r *G L _ r '
  • FIG. 11 there are two channel division units AT 0 and AT 1 and extended spatial parameters ATD 0 and ATDi applied to them, respectively are shown.
  • an extended spatial parameter is an inter-channel level difference
  • a channel dividing unit is able to decide levels of two divided channels using the extended spatial parameter.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Mathematical Physics (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Human Computer Interaction (AREA)
  • Health & Medical Sciences (AREA)
  • Computational Linguistics (AREA)
  • Stereophonic System (AREA)
  • Algebra (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Pure & Applied Mathematics (AREA)
  • Theoretical Computer Science (AREA)
PCT/KR2006/003666 2005-09-14 2006-09-14 Method and apparatus for decoding an audio signal Ceased WO2007032650A1 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
EP06783786.4A EP1946295B1 (en) 2005-09-14 2006-09-14 Method and apparatus for decoding an audio signal
HK09104644.3A HK1126306B (en) 2005-09-14 2006-09-14 Method and apparatus for decoding an audio signal
BRPI0616057-3A BRPI0616057A2 (pt) 2005-09-14 2006-09-14 método e aparelho para decodificar um sinal de aúdio
CA2621664A CA2621664C (en) 2005-09-14 2006-09-14 Method and apparatus for decoding an audio signal
AU2006291689A AU2006291689B2 (en) 2005-09-14 2006-09-14 Method and apparatus for decoding an audio signal
CN2006800420618A CN101351839B (zh) 2005-09-14 2006-09-14 解码音频信号的方法和装置
US12/066,651 US20080228501A1 (en) 2005-09-14 2006-09-14 Method and Apparatus For Decoding an Audio Signal
JP2008531018A JP2009508176A (ja) 2005-09-14 2006-09-14 オーディオ信号のデコーディング方法及び装置
US13/088,947 US20110196687A1 (en) 2005-09-14 2011-04-18 Method and Apparatus for Decoding an Audio Signal

Applications Claiming Priority (16)

Application Number Priority Date Filing Date Title
US71652405P 2005-09-14 2005-09-14
US60/716,524 2005-09-14
US75998006P 2006-01-19 2006-01-19
US60/759,980 2006-01-19
US76036006P 2006-01-20 2006-01-20
US60/760,360 2006-01-20
US77366906P 2006-02-16 2006-02-16
US60/773,669 2006-02-16
US77672406P 2006-02-27 2006-02-27
US60/776,724 2006-02-27
US78751606P 2006-03-31 2006-03-31
US60/787,516 2006-03-31
US81602206P 2006-06-22 2006-06-22
US60/816,022 2006-06-22
KR20060078300 2006-08-18
KR10-2006-0078300 2006-08-18

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US13/088,947 Continuation US20110196687A1 (en) 2005-09-14 2011-04-18 Method and Apparatus for Decoding an Audio Signal

Publications (1)

Publication Number Publication Date
WO2007032650A1 true WO2007032650A1 (en) 2007-03-22

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PCT/KR2006/003659 Ceased WO2007032646A1 (en) 2005-09-14 2006-09-14 Method and apparatus for decoding an audio signal
PCT/KR2006/003666 Ceased WO2007032650A1 (en) 2005-09-14 2006-09-14 Method and apparatus for decoding an audio signal
PCT/KR2006/003661 Ceased WO2007032647A1 (en) 2005-09-14 2006-09-14 Method and apparatus for decoding an audio signal
PCT/KR2006/003662 Ceased WO2007032648A1 (en) 2005-09-14 2006-09-14 Method and apparatus for decoding an audio signal

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PCT/KR2006/003662 Ceased WO2007032648A1 (en) 2005-09-14 2006-09-14 Method and apparatus for decoding an audio signal

Country Status (7)

Country Link
US (6) US20080228501A1 (enExample)
EP (4) EP1946297B1 (enExample)
JP (2) JP2009508176A (enExample)
KR (4) KR100857105B1 (enExample)
AU (1) AU2006291689B2 (enExample)
CA (1) CA2621664C (enExample)
WO (4) WO2007032646A1 (enExample)

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