WO2004061823A1 - Reducing scale factor transmission cost for mpeg-2 aac using a lattice - Google Patents

Reducing scale factor transmission cost for mpeg-2 aac using a lattice Download PDF

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Publication number
WO2004061823A1
WO2004061823A1 PCT/US2003/040173 US0340173W WO2004061823A1 WO 2004061823 A1 WO2004061823 A1 WO 2004061823A1 US 0340173 W US0340173 W US 0340173W WO 2004061823 A1 WO2004061823 A1 WO 2004061823A1
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WO
WIPO (PCT)
Prior art keywords
scale factor
band
frequency bands
scale
values
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/US2003/040173
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English (en)
French (fr)
Inventor
Mark Stuart Vinton
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.)
Dolby Laboratories Licensing Corp
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Dolby Laboratories Licensing Corp
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 DK03808458T priority Critical patent/DK1581928T3/da
Priority to AU2003303495A priority patent/AU2003303495B2/en
Priority to HK05111135.8A priority patent/HK1079327B/en
Priority to CA2507535A priority patent/CA2507535C/en
Priority to JP2004565543A priority patent/JP4425148B2/ja
Priority to MXPA05007183A priority patent/MXPA05007183A/es
Priority to DE60324465T priority patent/DE60324465D1/de
Priority to EP03808458A priority patent/EP1581928B1/en
Priority to CN2003801081720A priority patent/CN1735925B/zh
Application filed by Dolby Laboratories Licensing Corp filed Critical Dolby Laboratories Licensing Corp
Publication of WO2004061823A1 publication Critical patent/WO2004061823A1/en
Priority to IL168636A priority patent/IL168636A/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • G10L19/02—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

Definitions

  • the present invention is directed to a method for reducing the total bit cost of a perceptual audio encoder employing adaptive bit allocation in which a time domain representation of an audio signal is divided into successive time blocks, each time block is divided into frequency bands, and a scale factor is assigned to each of ones of the frequency bands, wherein the number of bits required to represent each block increases with increases in the scale factor values and with increases in band-to-band variations in scale factor values.
  • a ⁇ parameter which is a function of the value of the scale factor, is optional (if omitted, it is replaced by a constant value equal to 1) but greatly improves the performance of the algorithm if it is estimated accurately.
  • a i is assumed to be constant if the scale factors are only modified slightly from their preliminary value. For simplicity, this may be achieved by counting the number of MDCT coefficients in a band that has an absolute value greater than some predefined threshold.
  • Block 144 identifies the new, adjusted scale factor value for each backwardly successive scale factor band as i is decremented from N-1 to zero.
  • FIG. 3 shows the effect of applying the scale factor optimization of the present invention to the preliminary scale factors derived by means of the direct estimation technique for a single AAC audio frame.
  • the circles plotted in FIG. 3 represent the unadjusted scale factors; while the plus plotted points represent the adjusted scale factors according to an application of the present invention.
  • the scale factor optimization technique according to the present invention greatly reduces the variation in the scale factors. Also the adjusted scale factors are always increased, not just saving bits overall but decreasing the quantization noise not only in the bands in which the scale factors are increased, but also in other bands as a result of overall bit savings (thus allowing more bits to be allocated to other bands). The bit savings achieved by this technique are shown in FIG.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Human Computer Interaction (AREA)
  • Computational Linguistics (AREA)
  • Multimedia (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Enzymes And Modification Thereof (AREA)
  • Compression Of Band Width Or Redundancy In Fax (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Peptides Or Proteins (AREA)
PCT/US2003/040173 2003-01-02 2003-12-16 Reducing scale factor transmission cost for mpeg-2 aac using a lattice Ceased WO2004061823A1 (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
EP03808458A EP1581928B1 (en) 2003-01-02 2003-12-16 Reducing scale factor transmission cost for mpeg-2 aac using a lattice
AU2003303495A AU2003303495B2 (en) 2003-01-02 2003-12-16 Reducing scale factor transmission cost for MPEG-2 AAC using a lattice
HK05111135.8A HK1079327B (en) 2003-01-02 2003-12-16 Reducing scale factor transmission cost for mpeg-2 aac using a lattice
CA2507535A CA2507535C (en) 2003-01-02 2003-12-16 Reducing scale factor transmission cost for mpeg-2 advanced audio coding (aac) using a lattice based post processing technique
JP2004565543A JP4425148B2 (ja) 2003-01-02 2003-12-16 格子基ポスト処理技術を用いるｍｐｅｇ−２アドバンスドオーディオコーディング（ａａｃ）のためのスケール因子伝達コスト低減
DK03808458T DK1581928T3 (da) 2003-01-02 2003-12-16 Reduktion af skalafaktor transmissionsomkostninger for en MPEG-2 AAC under anvendelse af et gitter
DE60324465T DE60324465D1 (de) 2003-01-02 2003-12-16 Verringerung von skalierungsfaktor-übertragungskosten für mpeg-2-aac unter verwendung eines gitters
MXPA05007183A MXPA05007183A (es) 2003-01-02 2003-12-16 Reduccion del costo de transmision de factores de escala para codificacion de audio avanzada mpeg-2 usando una celosia.
CN2003801081720A CN1735925B (zh) 2003-01-02 2003-12-16 使用网格降低mpeg-2高级音频编码的比例因子传输成本
IL168636A IL168636A (en) 2003-01-02 2005-05-17 Reducing scale factor transmission cost for mpeg-2 aac using a lattice

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/336,637 2003-01-02
US10/336,637 US7272566B2 (en) 2003-01-02 2003-01-02 Reducing scale factor transmission cost for MPEG-2 advanced audio coding (AAC) using a lattice based post processing technique

Publications (1)

Publication Number Publication Date
WO2004061823A1 true WO2004061823A1 (en) 2004-07-22

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PCT/US2003/040173 Ceased WO2004061823A1 (en) 2003-01-02 2003-12-16 Reducing scale factor transmission cost for mpeg-2 aac using a lattice

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US (1) US7272566B2 (https=)
EP (1) EP1581928B1 (https=)
JP (1) JP4425148B2 (https=)
KR (1) KR101045520B1 (https=)
CN (1) CN1735925B (https=)
AT (1) ATE412960T1 (https=)
AU (1) AU2003303495B2 (https=)
CA (1) CA2507535C (https=)
DE (1) DE60324465D1 (https=)
DK (1) DK1581928T3 (https=)
ES (1) ES2312852T3 (https=)
IL (1) IL168636A (https=)
MX (1) MXPA05007183A (https=)
MY (1) MY138588A (https=)
PL (1) PL208346B1 (https=)
TW (1) TWI335145B (https=)
WO (1) WO2004061823A1 (https=)

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US7590523B2 (en) * 2006-03-20 2009-09-15 Mindspeed Technologies, Inc. Speech post-processing using MDCT coefficients
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US8010370B2 (en) * 2006-07-28 2011-08-30 Apple Inc. Bitrate control for perceptual coding
CN101308659B (zh) * 2007-05-16 2011-11-30 中兴通讯股份有限公司 一种基于先进音频编码器的心理声学模型的处理方法
US8788264B2 (en) * 2007-06-27 2014-07-22 Nec Corporation Audio encoding method, audio decoding method, audio encoding device, audio decoding device, program, and audio encoding/decoding system
EP2186087B1 (en) * 2007-08-27 2011-11-30 Telefonaktiebolaget L M Ericsson (PUBL) Improved transform coding of speech and audio signals
US8850154B2 (en) 2007-09-11 2014-09-30 2236008 Ontario Inc. Processing system having memory partitioning
US8904400B2 (en) 2007-09-11 2014-12-02 2236008 Ontario Inc. Processing system having a partitioning component for resource partitioning
US8694310B2 (en) 2007-09-17 2014-04-08 Qnx Software Systems Limited Remote control server protocol system
CN101854175B (zh) * 2007-10-12 2013-04-17 联咏科技股份有限公司 可降低信号功率频谱密度的编码方法
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Also Published As

Publication number Publication date
AU2003303495A1 (en) 2004-07-29
JP2006512617A (ja) 2006-04-13
ES2312852T3 (es) 2009-03-01
KR101045520B1 (ko) 2011-06-30
EP1581928A1 (en) 2005-10-05
ATE412960T1 (de) 2008-11-15
MXPA05007183A (es) 2005-09-12
CN1735925B (zh) 2010-04-28
CA2507535A1 (en) 2004-07-22
CA2507535C (en) 2013-02-12
CN1735925A (zh) 2006-02-15
DE60324465D1 (de) 2008-12-11
JP4425148B2 (ja) 2010-03-03
EP1581928B1 (en) 2008-10-29
TWI335145B (en) 2010-12-21
US7272566B2 (en) 2007-09-18
PL208346B1 (pl) 2011-04-29
PL377709A1 (pl) 2006-02-06
KR20050089870A (ko) 2005-09-08
AU2003303495B2 (en) 2009-02-19
DK1581928T3 (da) 2009-01-19
US20040131204A1 (en) 2004-07-08
TW200419929A (en) 2004-10-01
IL168636A (en) 2011-01-31
HK1079327A1 (en) 2006-03-31
MY138588A (en) 2009-07-31

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