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SE9604443L - Method and apparatus for low speed encoding and decoding - Google Patents

Method and apparatus for low speed encoding and decoding

Info

Publication number
SE9604443L
SE9604443L SE9604443A SE9604443A SE9604443L SE 9604443 L SE9604443 L SE 9604443L SE 9604443 A SE9604443 A SE 9604443A SE 9604443 A SE9604443 A SE 9604443A SE 9604443 L SE9604443 L SE 9604443L
Authority
SE
Sweden
Prior art keywords
codeword
index
prequantizer
quantizer
mode indicator
Prior art date
Application number
SE9604443A
Other languages
Swedish (sv)
Other versions
SE9604443D0 (en
Inventor
James Patrick Ashley
Weimin Peng
Peng Zhang
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 SE9604443D0 publication Critical patent/SE9604443D0/en
Publication of SE9604443L publication Critical patent/SE9604443L/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
    • G10L19/02—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 spectral analysis, e.g. transform vocoders or subband vocoders
    • G10L19/032—Quantisation or dequantisation of spectral components
    • G10L19/038—Vector quantisation, e.g. TwinVQ audio

Landscapes

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

Abstract

A system for low rate coding or decoding includes the use of a mode indicator in the coded signal to indicate whether prequantizer (i.e., coarse) or quantizer (i.e., fine) information is being sent. In a transmitter (300) embodiment both a prequantizer (212) and a restricted quantizer (214) search is performed of predefined prequantizer ("P") and quantizer ("V") codewords, respectively, to determine the codewords with the least residual energy. The index of the P or V codeword with the least residual is then determined (220), and this index is transmitted along with an appropriate P or V mode indicator. In a receiver (330) embodiment, the mode indicator is used to set the decoder (e.g., a vocoder) (350) to form a signal replica from a P codeword (determined from the transmitted index), or from a V codeword (from the transmitted V index) and previously determined P codeword (e.g., the centroid of the V codeword).
SE9604443A 1995-04-19 1996-12-03 Method and apparatus for low speed encoding and decoding SE9604443L (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US42478095A 1995-04-19 1995-04-19
PCT/US1996/003235 WO1996034383A1 (en) 1995-04-19 1996-03-07 Method and apparatus for low rate coding and decoding

Publications (2)

Publication Number Publication Date
SE9604443D0 SE9604443D0 (en) 1996-12-03
SE9604443L true SE9604443L (en) 1997-02-19

Family

ID=23683842

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9604443A SE9604443L (en) 1995-04-19 1996-12-03 Method and apparatus for low speed encoding and decoding

Country Status (14)

Country Link
JP (1) JPH10503633A (en)
CN (1) CN1150853A (en)
AU (1) AU683058B2 (en)
BR (1) BR9606292A (en)
CA (1) CA2191972A1 (en)
DE (1) DE19680399T1 (en)
FI (1) FI965131A (en)
FR (1) FR2733345B1 (en)
GB (1) GB2304508A (en)
IT (1) IT1285178B1 (en)
MX (1) MX9606368A (en)
PL (1) PL318012A1 (en)
SE (1) SE9604443L (en)
WO (1) WO1996034383A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9454974B2 (en) 2006-07-31 2016-09-27 Qualcomm Incorporated Systems, methods, and apparatus for gain factor limiting
CN104637483A (en) * 2015-02-03 2015-05-20 中国电子科技集团公司第五十八研究所 Multichannel-based low-speed voice coding/decoding system

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE6901749U (en) * 1969-01-17 1969-05-22 Huettenwerke Siegerland Ag DIFFUSER FOR BUNDGLUEHOEFEN
JPH02287399A (en) * 1989-04-28 1990-11-27 Fujitsu Ltd Vector quantization control system
US5010574A (en) * 1989-06-13 1991-04-23 At&T Bell Laboratories Vector quantizer search arrangement
US4974099A (en) * 1989-06-21 1990-11-27 International Mobile Machines Corporation Communication signal compression system and method
US4963030A (en) * 1989-11-29 1990-10-16 California Institute Of Technology Distributed-block vector quantization coder
FR2709366B1 (en) * 1993-03-26 2001-09-14 Motorola Inc Method for storing reflection coefficient vectors.

Also Published As

Publication number Publication date
GB9625742D0 (en) 1997-01-29
FI965131A0 (en) 1996-12-19
ITRM960235A1 (en) 1997-10-15
FR2733345A1 (en) 1996-10-25
DE19680399T1 (en) 1997-09-18
AU683058B2 (en) 1997-10-30
FR2733345B1 (en) 1997-07-25
IT1285178B1 (en) 1998-06-03
FI965131A (en) 1996-12-19
BR9606292A (en) 1997-11-18
ITRM960235A0 (en) 1996-04-15
SE9604443D0 (en) 1996-12-03
JPH10503633A (en) 1998-03-31
CA2191972A1 (en) 1996-10-31
AU6634996A (en) 1996-11-18
CN1150853A (en) 1997-05-28
GB2304508A (en) 1997-03-19
MX9606368A (en) 1997-03-29
WO1996034383A1 (en) 1996-10-31
PL318012A1 (en) 1997-05-12

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