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WO2008076534A3 - Code excited linear prediction speech coding - Google Patents

Code excited linear prediction speech coding Download PDF

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Publication number
WO2008076534A3
WO2008076534A3 PCT/US2007/083608 US2007083608W WO2008076534A3 WO 2008076534 A3 WO2008076534 A3 WO 2008076534A3 US 2007083608 W US2007083608 W US 2007083608W WO 2008076534 A3 WO2008076534 A3 WO 2008076534A3
Authority
WO
WIPO (PCT)
Prior art keywords
signal
error signal
speech
perceptually weighted
filter
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/US2007/083608
Other languages
French (fr)
Other versions
WO2008076534A2 (en
Inventor
Jonathan A Gibbs
Halil Fikretler
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.)
Motorola Solutions Inc
Original Assignee
Motorola 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
Application filed by Motorola Inc filed Critical Motorola Inc
Publication of WO2008076534A2 publication Critical patent/WO2008076534A2/en
Publication of WO2008076534A3 publication Critical patent/WO2008076534A3/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • 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
    • 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
    • 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
    • G10L19/06—Determination or coding of the spectral characteristics, e.g. of the short-term prediction coefficients
    • 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
    • G10L19/26—Pre-filtering or post-filtering

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computational Linguistics (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Human Computer Interaction (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

A CELP speech coder encodes a speech signal. The coder comprises a prediction filter (218) generating a predicted speech signal in response to an excitation signal. A subtraction unit (216) generates an error signal indicative of a difference between the predicted speech signal and the speech signal and a perceptual weighting filter filters the error signal to generate a perceptually weighted error signal which is filtered in a shaping filter (234) to generate a shaped error signal. The shaping filter (234) modifies a level of the perceptually weighted error signal in a lower frequency interval relative to a higher frequency interval. A codebook search controller (220) selects an encode excitation signal in response to the shaped error signal and an encoded signal is generated which comprises an indication of the encoded excitation signal. The shaping of the perceptually weighted error signal allows easy and efficient adjustment of a trade-off between wideband and narrowband speech quality.
PCT/US2007/083608 2006-12-13 2007-11-05 Code excited linear prediction speech coding Ceased WO2008076534A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0624860A GB2444757B (en) 2006-12-13 2006-12-13 Code excited linear prediction speech coding
GB0624860.3 2006-12-13

Publications (2)

Publication Number Publication Date
WO2008076534A2 WO2008076534A2 (en) 2008-06-26
WO2008076534A3 true WO2008076534A3 (en) 2008-11-27

Family

ID=37712051

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2007/083608 Ceased WO2008076534A2 (en) 2006-12-13 2007-11-05 Code excited linear prediction speech coding

Country Status (2)

Country Link
GB (1) GB2444757B (en)
WO (1) WO2008076534A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105469805B (en) 2012-03-01 2018-01-12 华为技术有限公司 A kind of voice frequency signal treating method and apparatus

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6795805B1 (en) * 1998-10-27 2004-09-21 Voiceage Corporation Periodicity enhancement in decoding wideband signals

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE319162T1 (en) * 2001-01-19 2006-03-15 Koninkl Philips Electronics Nv BROADBAND SIGNAL TRANSMISSION SYSTEM
WO2002093561A1 (en) * 2001-05-11 2002-11-21 Siemens Aktiengesellschaft Method for enlarging the band width of a narrow-band filtered voice signal, especially a voice signal emitted by a telecommunication appliance
KR100503415B1 (en) * 2002-12-09 2005-07-22 한국전자통신연구원 Transcoding apparatus and method between CELP-based codecs using bandwidth extension
EP1604354A4 (en) * 2003-03-15 2008-04-02 Mindspeed Tech Inc Voicing index controls for celp speech coding
AU2006232362B2 (en) * 2005-04-01 2009-10-08 Qualcomm Incorporated Systems, methods, and apparatus for highband time warping

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6795805B1 (en) * 1998-10-27 2004-09-21 Voiceage Corporation Periodicity enhancement in decoding wideband signals

Also Published As

Publication number Publication date
GB0624860D0 (en) 2007-01-24
GB2444757A (en) 2008-06-18
GB2444757B (en) 2009-04-22
WO2008076534A2 (en) 2008-06-26

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