WO2003021573A1 - Codec - Google Patents

Codec Download PDF

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Publication number
WO2003021573A1
WO2003021573A1 PCT/JP2001/007580 JP0107580W WO03021573A1 WO 2003021573 A1 WO2003021573 A1 WO 2003021573A1 JP 0107580 W JP0107580 W JP 0107580W WO 03021573 A1 WO03021573 A1 WO 03021573A1
Authority
WO
WIPO (PCT)
Prior art keywords
coding
codec
parameters
feature
feature parameter
Prior art date
Application number
PCT/JP2001/007580
Other languages
French (fr)
Japanese (ja)
Inventor
Teruyuki Sato
Yasutaka Kanayama
Original Assignee
Fujitsu Limited
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 Fujitsu Limited filed Critical Fujitsu Limited
Priority to JP2003525836A priority Critical patent/JPWO2003021573A1/en
Priority to PCT/JP2001/007580 priority patent/WO2003021573A1/en
Publication of WO2003021573A1 publication Critical patent/WO2003021573A1/en

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
    • 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
    • G10L19/16—Vocoder architecture
    • G10L19/18—Vocoders using multiple modes
    • G10L19/24—Variable rate codecs, e.g. for generating different qualities using a scalable representation such as hierarchical encoding or layered encoding

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (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)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)

Abstract

A coding bit rate controlling method and a codec using the method in which the codec itself has a function of recognizing rate information. This codec is provided with a coder and a decoder. The coder includes means for coding a voice signal at any of a plurality of coding rates and means for sending coded data to a transmission line after attaching a feature parameter of the voice signal and coding parameters including a coding index to the information on the coding rate. The decoder includes means for extracting the feature parameter from the coding parameters of a predetermined frame construction contained in the coding data, means for decoding the extracted feature parameter at each of the plurality of coding rates, means for storing the feature parameters decoded in the past, and means for judging the matching between the stored past feature parameters and the feature parameters decoded by the decoding means.
PCT/JP2001/007580 2001-08-31 2001-08-31 Codec WO2003021573A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2003525836A JPWO2003021573A1 (en) 2001-08-31 2001-08-31 Codec
PCT/JP2001/007580 WO2003021573A1 (en) 2001-08-31 2001-08-31 Codec

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2001/007580 WO2003021573A1 (en) 2001-08-31 2001-08-31 Codec

Publications (1)

Publication Number Publication Date
WO2003021573A1 true WO2003021573A1 (en) 2003-03-13

Family

ID=11737692

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2001/007580 WO2003021573A1 (en) 2001-08-31 2001-08-31 Codec

Country Status (2)

Country Link
JP (1) JPWO2003021573A1 (en)
WO (1) WO2003021573A1 (en)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03108824A (en) * 1989-06-29 1991-05-09 Fujitsu Ltd Voice coding/decoding transmission system
JPH08279811A (en) * 1995-04-07 1996-10-22 Nec Corp Voice data converter
JPH08305398A (en) * 1995-04-28 1996-11-22 Matsushita Electric Ind Co Ltd Voice decoding device
JPH09503874A (en) * 1994-08-05 1997-04-15 クゥアルコム・インコーポレイテッド Method and apparatus for performing reduced rate, variable rate speech analysis and synthesis
JPH1049199A (en) * 1996-08-02 1998-02-20 Nec Corp Silence compressed voice coding and decoding device
JPH10124099A (en) * 1996-10-15 1998-05-15 Olympus Optical Co Ltd Speech recording device
JP2000010591A (en) * 1998-06-19 2000-01-14 Oki Electric Ind Co Ltd Voice encoding rate selector and voice encoding device
JP2000078274A (en) * 1998-08-18 2000-03-14 Denso Corp Message recorder for variable rate coding system, and method for recording size reduced message in the variable rate coding system
JP2001024524A (en) * 1999-05-05 2001-01-26 Texas Instr Inc <Ti> Map rate detection for variable rate codec
JP2001318694A (en) * 2000-05-10 2001-11-16 Toshiba Corp Device and method for signal processing and recording medium

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03108824A (en) * 1989-06-29 1991-05-09 Fujitsu Ltd Voice coding/decoding transmission system
JPH09503874A (en) * 1994-08-05 1997-04-15 クゥアルコム・インコーポレイテッド Method and apparatus for performing reduced rate, variable rate speech analysis and synthesis
JPH08279811A (en) * 1995-04-07 1996-10-22 Nec Corp Voice data converter
JPH08305398A (en) * 1995-04-28 1996-11-22 Matsushita Electric Ind Co Ltd Voice decoding device
JPH1049199A (en) * 1996-08-02 1998-02-20 Nec Corp Silence compressed voice coding and decoding device
JPH10124099A (en) * 1996-10-15 1998-05-15 Olympus Optical Co Ltd Speech recording device
JP2000010591A (en) * 1998-06-19 2000-01-14 Oki Electric Ind Co Ltd Voice encoding rate selector and voice encoding device
JP2000078274A (en) * 1998-08-18 2000-03-14 Denso Corp Message recorder for variable rate coding system, and method for recording size reduced message in the variable rate coding system
JP2001024524A (en) * 1999-05-05 2001-01-26 Texas Instr Inc <Ti> Map rate detection for variable rate codec
JP2001318694A (en) * 2000-05-10 2001-11-16 Toshiba Corp Device and method for signal processing and recording medium

Also Published As

Publication number Publication date
JPWO2003021573A1 (en) 2004-12-24

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