EP0801790B1 - Verfahren zur sprachkodierung mittels analyse durch synthese - Google Patents

Verfahren zur sprachkodierung mittels analyse durch synthese Download PDF

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Publication number
EP0801790B1
EP0801790B1 EP96901010A EP96901010A EP0801790B1 EP 0801790 B1 EP0801790 B1 EP 0801790B1 EP 96901010 A EP96901010 A EP 96901010A EP 96901010 A EP96901010 A EP 96901010A EP 0801790 B1 EP0801790 B1 EP 0801790B1
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frame
filter
term
sub
short
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Expired - Lifetime
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EP96901010A
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English (en)
French (fr)
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EP0801790A1 (de
Inventor
William Navarro
Michel Mauc
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Nortel Networks France SAS
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Matra Nortel Communications SAS
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    • 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
    • G10L19/083—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters the excitation function being an excitation gain
    • 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
    • G10L19/10—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters the excitation function being a multipulse excitation
    • 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
    • G10L2019/0001—Codebooks
    • G10L2019/0003—Backward prediction of gain
    • 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
    • G10L2019/0001—Codebooks
    • G10L2019/0011—Long term prediction filters, i.e. pitch estimation
    • 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
    • G10L2019/0001—Codebooks
    • G10L2019/0012—Smoothing of parameters of the decoder interpolation
    • 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
    • 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
    • G10L25/93—Discriminating between voiced and unvoiced parts of speech signals

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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)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)

Claims (5)

  1. Verfahren zur Syntheseanalyse-Codierung eines Sprachsignals, das in aufeinanderfolgende Blöcke digitalisiert ist, die in Unterblöcke umfassend eine bestimmte Zahl von Proben unterteilt sind, bei welchem man für jeden Block eine Analyse mittels linearer Prädiktion des Sprachsignals zur Bestimmung der Koeffizienten eines Kurzzeit-Synthesefilters (60) und eine Analyse in offener Schleife zur Bestimmung eines Grads der Stimmhaftigkeit des Blocks durchführt, und man für jeden Unterblock wenigstens eine Analyse in geschlossener Schleife zur Bestimmung einer Anregungssequenz durchführt, welche nach Behandlung durch das Kurzzeit-Synthesefilter ein für das Sprachsignal repräsentatives synthetisches Signal erzeugt, wobei jede Analyse in geschlossener Schleife die Impulsantwort eines Filters verwendet, das aus dem Kurzzeit-Synthesefilter und einem Wahrnehmungswichtungsfilter zusammengesetzt ist, dadurch gekennzeichnet, daß man bei jeder Analyse in geschlossener Schleife die Impulsantwort verwendet, indem man sie bei einer Abbruchlänge (Lh) abbricht, welche höchstens gleich der Zahl (Ist) der Proben pro Unterblock ist und von der Energieverteilung der Antwort und vom Grad der Stimmhaftigkeit des Blocks abhängt.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Impulsantwort des zusammengesetzten Filters auf einer Gesamtlänge (pst) berechnet ist, die größer als die Zahl (Ist) der Proben pro Unterblock ist, daß man eine Minimallänge Lα derart bestimmt, daß die durch Abbrechen der Antwort bei Lα Proben berechnete Energie der Impulsantwort mindestens gleich einem bestimmten Bruchteil (α) der auf der Gesamtlänge (pst) berechneten Energie der Impulsantwort ist, und daß die Abbruchlänge (Lh) gleich der Summe der Minimallänge Lα und eines Korrekturterms (Δ(MV)) ist, der vom Grad der Stimmhaftigkeit des Blocks abhängt, wenn die Summe kleiner als die Zahl (Ist) der Proben pro Unterblock ist.
  3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß der Korrekturterm (Δ(MV)) eine mit dem Grad der Stimmhaftigkeit zunehmende Funktion ist.
  4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Wahrnehmungswichtungsfilter eine Transferfunktion der Form W(z) =A(z/γ1)/A(z/γ2) hat, worin 1/A(z) die Transferfunktion des Kurzzeit-Synthesefilters bezeichnet und γ1 und γ2 zwei Koeffizienten mit 0 < γ2 < γ1 < 1 sind.
  5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß man die Koeffizienten des Kurzzeit-Synthesefilters durch Spektrallinien-Parameter (LSP) darstellt, daß man die Spektrallinien-Parameter quantisiert, daß man zur Bildung des Kurzzeit-Synthesefilters, dem die auf wenigstens einen Unterblock eines Blocks bezogene Anregungssequenz zugeführt wird, eine Interpolation zwischen den auf den Block bezogenen und den auf den vorhergehenden Block bezogenen Spektrallinien-Parametern durchführt, und daß man zur Berechnung der Impulsantwort des zusammengesetzten Filters das Kurzzeit-Synthesefilter auf Grundlage der quantisierten und interpolierten Spektrallinien-Parameter berechnet, wohingegen man das Wahrnehmungswichtungsfilter auf Grundlage der interpolierten, jedoch nicht quantisierten Spektrallinien-Parameter berechnet.
EP96901010A 1995-01-06 1996-01-03 Verfahren zur sprachkodierung mittels analyse durch synthese Expired - Lifetime EP0801790B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9500135A FR2729247A1 (fr) 1995-01-06 1995-01-06 Procede de codage de parole a analyse par synthese
FR9500135 1995-01-06
PCT/FR1996/000006 WO1996021220A1 (fr) 1995-01-06 1996-01-03 Procede de codage de parole a analyse par synthese

Publications (2)

Publication Number Publication Date
EP0801790A1 EP0801790A1 (de) 1997-10-22
EP0801790B1 true EP0801790B1 (de) 1999-05-12

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EP96901010A Expired - Lifetime EP0801790B1 (de) 1995-01-06 1996-01-03 Verfahren zur sprachkodierung mittels analyse durch synthese

Country Status (10)

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US (1) US5963898A (de)
EP (1) EP0801790B1 (de)
CN (1) CN1173938A (de)
AT (1) ATE180092T1 (de)
AU (1) AU697892B2 (de)
BR (1) BR9606887A (de)
CA (1) CA2209623A1 (de)
DE (1) DE69602421T2 (de)
FR (1) FR2729247A1 (de)
WO (1) WO1996021220A1 (de)

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Also Published As

Publication number Publication date
BR9606887A (pt) 1997-10-28
DE69602421D1 (de) 1999-06-17
DE69602421T2 (de) 1999-12-23
AU4490396A (en) 1996-07-24
AU697892B2 (en) 1998-10-22
FR2729247B1 (de) 1997-03-07
CA2209623A1 (en) 1996-07-11
ATE180092T1 (de) 1999-05-15
CN1173938A (zh) 1998-02-18
WO1996021220A1 (fr) 1996-07-11
FR2729247A1 (fr) 1996-07-12
US5963898A (en) 1999-10-05
EP0801790A1 (de) 1997-10-22

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