DE69708693C5 - Verfahren und Vorrichtung für CELP Sprachcodierung oder -decodierung - Google Patents

Verfahren und Vorrichtung für CELP Sprachcodierung oder -decodierung Download PDF

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Publication number
DE69708693C5
DE69708693C5 DE69708693.3T DE69708693T DE69708693C5 DE 69708693 C5 DE69708693 C5 DE 69708693C5 DE 69708693 T DE69708693 T DE 69708693T DE 69708693 C5 DE69708693 C5 DE 69708693C5
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Prior art keywords
vector
random
codebook
random code
code vector
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DE69708693.3T
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English (en)
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DE69708693D1 (de
DE69708693T2 (de
Inventor
Kazutoshi Yasunaga
Toshiyuki Morii
Taisuke Watanabe
Hiroyuki Ehara
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Panasonic Corp
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Godo Kaisha IP Bridge 1
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Priority claimed from JP29473896A external-priority patent/JP4003240B2/ja
Priority claimed from JP31032496A external-priority patent/JP4006770B2/ja
Priority claimed from JP03458397A external-priority patent/JP3700310B2/ja
Priority claimed from JP03458297A external-priority patent/JP3174742B2/ja
Application filed by Godo Kaisha IP Bridge 1 filed Critical Godo Kaisha IP Bridge 1
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Publication of DE69708693T2 publication Critical patent/DE69708693T2/de
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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
    • G10L19/04—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
    • G10L19/135—Vector sum excited linear prediction [VSELP]
    • 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
    • G10L19/04—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 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
    • G10L2019/0001—Codebooks
    • G10L2019/0007—Codebook element generation
    • 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
    • G10L2019/0001—Codebooks
    • G10L2019/0013—Codebook search algorithms

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  • Engineering & Computer Science (AREA)
  • Computational Linguistics (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Analogue/Digital Conversion (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)

Abstract

A CELP speech coder or decoder, comprising:an adaptive codebook (223) for generating an adaptive code vector;a random codebook (221,211), for generating a random code vector;a synthesis filter (215) for receiving a random code vector generated from the random codebook (221,211) so as to perform LPC synthesis;means (225) for determining a voiced/unvoiced characteristic of the input speech;a second random codebook for generating random code vectors; andselecting means for selecting one of said random codebook and said second random codebook; characterized in thatsaid random codebook (221, 211) is formed by an excitation vector generator comprising fixed waveform arranging means (182) for arranging one or more fixed waveforms (v1, v2, v3) stored in a fixed waveform storage means (181) in accordance with the positions (P1, P2, P3) and polarities of an input impulse vector, and in thatthe random codebook generates the random code vector in accordance with the determined voiced/unvoiced characteristic,wherein the determination of the voiced/unvoiced characteristic of the input speech is based on a value of a quantized pitch gain, andif the value of the quantized pitch gain is small, by which it is considered that the input speech is unvoiced, said selecting means selects said random codebook.

Description

Claims (10)

  1. A CELP speech coder or decoder, comprising: an adaptive codebook (223) for generating an adaptive code vector; a random codebook (221,211), for generating a random code vector; a synthesis filter (215) for receiving a random code vector generated from the random codebook (221,211) so as to perform LPC synthesis; means (225) for determining a voiced/unvoiced characteristic of the input speech; a second random codebook for generating random code vectors; and selecting means for selecting one of said random codebook and said second random codebook; characterized in that said random codebook (221, 211) is formed by an excitation vector generator comprising fixed waveform arranging means (182) for arranging one or more fixed waveforms (v1, v2, v3) stored in a fixed waveform storage means (181) in accordance with the positions (P1, P2, P3) and polarities of an input impulse vector, and in that the random codebook generates the random code vector in accordance with the determined voiced/unvoiced characteristic, wherein the determination of the voiced/unvoiced characteristic of the input speech is based on a value of a quantized pitch gain, and if the value of the quantized pitch gain is small, by which it is considered that the input speech is unvoiced, said selecting means selects said random codebook.
  2. A CELP speech coder/decoder according to claim 1, wherein said fixed waveform arranging means (182) shifts said fixed waveforms read from the fixed waveform storage means (181) according to the positions (P1, P2, P3) and polarities of said pulses of said input impulse vector.
  3. A CELP speech coder/decoder according to claim 1, wherein said fixed waveform arranging means (182) convolutes said fixed waveforms read from the fixed waveform storage means (181) with said input impulse vector (P1, P2, P3).
  4. The CELP speech coder/decoder according to one of claims 1 to 3, wherein the excitation vector generator generates a corresponding random code vector by changing said fixed waveforms either to be arranged, shifted or convoluted.
  5. The CELP speech coder/decoder according to one of claims 1 to 3, wherein the excitation vector generator generates a different random code vector by changing the fixed waveform used for the modification of the vector provided from an algebraic codebook.
  6. A CELP speech coding or decoding method, comprising the steps of; generating an adaptive code vector; determining a voiced/unvoiced characteristic of the input speech; generating a random code vector in accordance with said determined voiced/unvoiced characteristic by arranging one or more fixed waveforms in accordance with the positions (P1, P2, P3) and polarities of an input impulse vector; wherein one of a random code vector generated by said arranging and a random code vector not modified by said arranging is selected; outputting the random code vector to a synthesis filter to perform LPC synthesis, wherein the determination of the voiced/unvoiced characteristic of the input speech is based on a value of a quantized pitch gain, and if the value of the quantized pitch gain is small, by which it is considered that the input speech is unvoiced, the random code vector generated by the arranging is selected.
  7. The method according to claim 6, wherein said arranging step shifts said fixed waveforms according to the positions and polarities of said pulses of said input impulse vector.
  8. The method according to claim 6, wherein said arranging step convolutes said fixed waveforms with said input impulse vector.
  9. The method according to one of claims 6-8, wherein said random code vector is generated by changing said fixed waveforms either to be arranged, shifted or convoluted.
  10. The method according to one of claims 6 to 9, wherein said different random code vector is generated by changing the fixed waveform used for the modification of the vector provided from an algebraic codebook.
DE69708693.3T 1996-11-07 1997-11-06 Verfahren und Vorrichtung für CELP Sprachcodierung oder -decodierung Expired - Lifetime DE69708693C5 (de)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
JP29473896 1996-11-07
JP29473896A JP4003240B2 (ja) 1996-11-07 1996-11-07 音声符号化装置及び音声復号化装置
JP31032496A JP4006770B2 (ja) 1996-11-21 1996-11-21 ノイズ推定装置、ノイズ削減装置、ノイズ推定方法、及びノイズ削減方法
JP31032496 1996-11-21
JP3458397 1997-02-19
JP03458397A JP3700310B2 (ja) 1997-02-19 1997-02-19 ベクトル量子化装置及びベクトル量子化方法
JP3458297 1997-02-19
JP03458297A JP3174742B2 (ja) 1997-02-19 1997-02-19 Ｃｅｌｐ型音声復号化装置及びｃｅｌｐ型音声復号化方法

Publications (3)

Publication Number Publication Date
DE69708693D1 DE69708693D1 (de) 2002-01-10
DE69708693T2 DE69708693T2 (de) 2002-08-01
DE69708693C5 true DE69708693C5 (de) 2021-10-28

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Family Applications (17)

Application Number Title Priority Date Filing Date
DE69708693.3T Expired - Lifetime DE69708693C5 (de) 1996-11-07 1997-11-06 Verfahren und Vorrichtung für CELP Sprachcodierung oder -decodierung
DE69713633T Expired - Lifetime DE69713633T2 (de) 1996-11-07 1997-11-06 Verfahren zur Erzeugung eines Vektorquantisierungs-Codebuchs
DE69712539T Expired - Lifetime DE69712539T2 (de) 1996-11-07 1997-11-06 Verfahren und Vorrichtung zur Erzeugung eines Vektorquantisierungs-Codebuchs
DE69710505T Expired - Lifetime DE69710505T2 (de) 1996-11-07 1997-11-06 Verfahren und Vorrichtung zur Erzeugung eines Vektorquantisierungs-Codebuchs
DE69721595T Expired - Lifetime DE69721595T2 (de) 1996-11-07 1997-11-06 Verfahren zur Erzeugung eines Vektorquantisierungs-Codebuchs
DE69712537T Expired - Lifetime DE69712537T2 (de) 1996-11-07 1997-11-06 Verfahren zur Erzeugung eines Vektorquantisierungs-Codebuchs
DE69723324T Expired - Lifetime DE69723324T2 (de) 1996-11-07 1997-11-06 Verfahren zur Erzeugung eines Vektorquantisierungs-codebuchs
DE69712538T Expired - Lifetime DE69712538T2 (de) 1996-11-07 1997-11-06 Verfahren zur Erzeugung eines Vektorquantisierungs-Codebuchs
DE69712927T Expired - Lifetime DE69712927T2 (de) 1996-11-07 1997-11-06 CELP-Codec
DE69708697T Expired - Lifetime DE69708697T2 (de) 1996-11-07 1997-11-06 Verfahren zur Erzeugung eines Vektorquantisierungs-codebuchs, und Vorrichtung und Verfahren zur Sprachcodierung/-decodierung
DE69711715T Expired - Lifetime DE69711715T2 (de) 1996-11-07 1997-11-06 Anregungsvektorerzeugung
DE69708696T Expired - Lifetime DE69708696T2 (de) 1996-11-07 1997-11-06 Verfahren und Vorrichtung zur Erzeugung eines Vektorquantisierungs-codebuchs
DE69715478T Expired - Lifetime DE69715478T2 (de) 1996-11-07 1997-11-06 Verfahren und Vorrichtung zur CELP Sprachkodierung und -dekodierung
DE69730316T Expired - Lifetime DE69730316T2 (de) 1996-11-07 1997-11-06 Schallquellengenerator, sprachkodierer und sprachdekodierer
DE69712535T Expired - Lifetime DE69712535T2 (de) 1996-11-07 1997-11-06 Vorrichtung zur Erzeugung eines Vektorquantisierungs-Codebuchs
DE69710794T Expired - Lifetime DE69710794T2 (de) 1996-11-07 1997-11-06 Vorrichtungzur Erzeugung eines Vektorquantisierungs-Codebuchs
DE69712928T Expired - Lifetime DE69712928T2 (de) 1996-11-07 1997-11-06 Verfahren zur Erzeugung eines Vektorquantisierungs-codebuchs

Family Applications After (16)

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DE69713633T Expired - Lifetime DE69713633T2 (de) 1996-11-07 1997-11-06 Verfahren zur Erzeugung eines Vektorquantisierungs-Codebuchs
DE69712539T Expired - Lifetime DE69712539T2 (de) 1996-11-07 1997-11-06 Verfahren und Vorrichtung zur Erzeugung eines Vektorquantisierungs-Codebuchs
DE69710505T Expired - Lifetime DE69710505T2 (de) 1996-11-07 1997-11-06 Verfahren und Vorrichtung zur Erzeugung eines Vektorquantisierungs-Codebuchs
DE69721595T Expired - Lifetime DE69721595T2 (de) 1996-11-07 1997-11-06 Verfahren zur Erzeugung eines Vektorquantisierungs-Codebuchs
DE69712537T Expired - Lifetime DE69712537T2 (de) 1996-11-07 1997-11-06 Verfahren zur Erzeugung eines Vektorquantisierungs-Codebuchs
DE69723324T Expired - Lifetime DE69723324T2 (de) 1996-11-07 1997-11-06 Verfahren zur Erzeugung eines Vektorquantisierungs-codebuchs
DE69712538T Expired - Lifetime DE69712538T2 (de) 1996-11-07 1997-11-06 Verfahren zur Erzeugung eines Vektorquantisierungs-Codebuchs
DE69712927T Expired - Lifetime DE69712927T2 (de) 1996-11-07 1997-11-06 CELP-Codec
DE69708697T Expired - Lifetime DE69708697T2 (de) 1996-11-07 1997-11-06 Verfahren zur Erzeugung eines Vektorquantisierungs-codebuchs, und Vorrichtung und Verfahren zur Sprachcodierung/-decodierung
DE69711715T Expired - Lifetime DE69711715T2 (de) 1996-11-07 1997-11-06 Anregungsvektorerzeugung
DE69708696T Expired - Lifetime DE69708696T2 (de) 1996-11-07 1997-11-06 Verfahren und Vorrichtung zur Erzeugung eines Vektorquantisierungs-codebuchs
DE69715478T Expired - Lifetime DE69715478T2 (de) 1996-11-07 1997-11-06 Verfahren und Vorrichtung zur CELP Sprachkodierung und -dekodierung
DE69730316T Expired - Lifetime DE69730316T2 (de) 1996-11-07 1997-11-06 Schallquellengenerator, sprachkodierer und sprachdekodierer
DE69712535T Expired - Lifetime DE69712535T2 (de) 1996-11-07 1997-11-06 Vorrichtung zur Erzeugung eines Vektorquantisierungs-Codebuchs
DE69710794T Expired - Lifetime DE69710794T2 (de) 1996-11-07 1997-11-06 Vorrichtungzur Erzeugung eines Vektorquantisierungs-Codebuchs
DE69712928T Expired - Lifetime DE69712928T2 (de) 1996-11-07 1997-11-06 Verfahren zur Erzeugung eines Vektorquantisierungs-codebuchs

Country Status (9)

Country Link
US (20) US6453288B1 (de)
EP (16) EP1071081B1 (de)
KR (9) KR100306817B1 (de)
CN (11) CN1178204C (de)
AU (1) AU4884297A (de)
CA (1) CA2242345C (de)
DE (17) DE69708693C5 (de)
HK (2) HK1017472A1 (de)
WO (1) WO1998020483A1 (de)

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