WO2002023533A3 - System for improved use of pitch enhancement with subcodebooks - Google Patents

System for improved use of pitch enhancement with subcodebooks Download PDF

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Publication number
WO2002023533A3
WO2002023533A3 PCT/IB2001/001735 IB0101735W WO0223533A3 WO 2002023533 A3 WO2002023533 A3 WO 2002023533A3 IB 0101735 W IB0101735 W IB 0101735W WO 0223533 A3 WO0223533 A3 WO 0223533A3
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WO
WIPO (PCT)
Prior art keywords
speech
rate
codec
rate codec
subcodebooks
Prior art date
Application number
PCT/IB2001/001735
Other languages
French (fr)
Other versions
WO2002023533A2 (en
Inventor
Yang Gao
Original Assignee
Conexant Systems Inc
Yang Gao
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
Application filed by Conexant Systems Inc, Yang Gao filed Critical Conexant Systems Inc
Priority to AU2001287973A priority Critical patent/AU2001287973A1/en
Publication of WO2002023533A2 publication Critical patent/WO2002023533A2/en
Publication of WO2002023533A3 publication Critical patent/WO2002023533A3/en

Links

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
    • G10L21/00—Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0316—Speech enhancement, e.g. noise reduction or echo cancellation by changing the amplitude
    • G10L21/0364—Speech enhancement, e.g. noise reduction or echo cancellation by changing the amplitude for improving intelligibility
    • 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
    • G10L2019/0004—Design or structure of the codebook
    • G10L2019/0005—Multi-stage vector quantisation

Abstract

A speech compression system capable of encoding a speech signal into a bitstream for subsequent decoding to generate synthesized speech is disclosed. The speech compression system optimizes the bandwidth consumed by the bitstream by balancing the desired average bit rate with the perceptual quality of the reconstructed speech. The speech compression system comprises a full-rate codec, a half-rate codec, a quarter-rate codec and an eighth-rate codec. The codecs are selectively activated based on a rate selection. In addition, the full and half-rate codec are selectively activated based on a type classification. Each codec is selectively activated to encode and decode the speech signals at different bit rates emphasizing different aspects of the speech signal to enhance overall quality of the synthesized speech. The overall quality of the system is strongly related to the excitation. In order to enhance the excitation, the system contains a fixed codebook comprising several subcodebooks. The invention reveals a way to apply a pitch enhancement efficiently and differently for different subcodebooks without using additional bits. The technique is particularly applicable to selectable mode vocoder (SMV) systems.
PCT/IB2001/001735 2000-09-15 2001-09-17 System for improved use of pitch enhancement with subcodebooks WO2002023533A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001287973A AU2001287973A1 (en) 2000-09-15 2001-09-17 System for improved use of pitch enhancement with subcodebooks

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US23293800P 2000-09-15 2000-09-15
US60/232,938 2000-09-15

Publications (2)

Publication Number Publication Date
WO2002023533A2 WO2002023533A2 (en) 2002-03-21
WO2002023533A3 true WO2002023533A3 (en) 2002-08-15

Family

ID=22875191

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2001/001735 WO2002023533A2 (en) 2000-09-15 2001-09-17 System for improved use of pitch enhancement with subcodebooks

Country Status (2)

Country Link
AU (1) AU2001287973A1 (en)
WO (1) WO2002023533A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI119955B (en) * 2001-06-21 2009-05-15 Nokia Corp Method, encoder and apparatus for speech coding in an analysis-through-synthesis speech encoder

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000011657A1 (en) * 1998-08-24 2000-03-02 Conexant Systems, Inc. Completed fixed codebook for speech encoder

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000011657A1 (en) * 1998-08-24 2000-03-02 Conexant Systems, Inc. Completed fixed codebook for speech encoder
US6173257B1 (en) * 1998-08-24 2001-01-09 Conexant Systems, Inc Completed fixed codebook for speech encoder

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
MCCLELLAN S ET AL: "EFFICIENT PITCH FILTER ENCODING FOR VARIABLE RATE SPEECH PROCESSING", IEEE TRANSACTIONS ON SPEECH AND AUDIO PROCESSING, IEEE INC. NEW YORK, US, vol. 7, no. 1, January 1999 (1999-01-01), pages 18 - 29, XP000890821, ISSN: 1063-6676 *

Also Published As

Publication number Publication date
AU2001287973A1 (en) 2002-03-26
WO2002023533A2 (en) 2002-03-21

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