GB2304508A - Method and apparatus for low rate coding and decoding - Google Patents

Method and apparatus for low rate coding and decoding

Info

Publication number
GB2304508A
GB2304508A GB9625742A GB9625742A GB2304508A GB 2304508 A GB2304508 A GB 2304508A GB 9625742 A GB9625742 A GB 9625742A GB 9625742 A GB9625742 A GB 9625742A GB 2304508 A GB2304508 A GB 2304508A
Authority
GB
United Kingdom
Prior art keywords
codeword
index
prequantizer
quantizer
low rate
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.)
Withdrawn
Application number
GB9625742A
Other versions
GB9625742D0 (en
Inventor
James Patrick Ashley
Weimin Peng
Peng Zhang
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 GB9625742D0 publication Critical patent/GB9625742D0/en
Publication of GB2304508A publication Critical patent/GB2304508A/en
Withdrawn legal-status Critical Current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
    • 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).
GB9625742A 1995-04-19 1996-03-07 Method and apparatus for low rate coding and decoding Withdrawn GB2304508A (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
GB9625742D0 GB9625742D0 (en) 1997-01-29
GB2304508A true GB2304508A (en) 1997-03-19

Family

ID=23683842

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9625742A Withdrawn GB2304508A (en) 1995-04-19 1996-03-07 Method and apparatus for low rate coding 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) FI965131A0 (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

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5010574A (en) * 1989-06-13 1991-04-23 At&T Bell Laboratories Vector quantizer search arrangement

Family Cites Families (5)

* 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
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.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5010574A (en) * 1989-06-13 1991-04-23 At&T Bell Laboratories Vector quantizer search arrangement

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
GSM 06.20, Version 0.0.4, 11 January 1995, European Digital Cellular Telecommunications System;Half *
rate speech part 2:Half rate speech Transcoding, pages 1-56 Speech Processing, vol.1,23-26 March1992 *
San Franscisco, CA,US. pages 321-324, XP000341148 Miyano et al"Improved 4.8KB/S celp coding using *
two-stage vector quantization with multiple candidates (lcelp)" see paragraph 2.3 *
Vector quantization and signal compression, Kluwer Academic Publishers, 1992, pages 309-315, 410-423 *

Also Published As

Publication number Publication date
ITRM960235A0 (en) 1996-04-15
SE9604443D0 (en) 1996-12-03
CA2191972A1 (en) 1996-10-31
DE19680399T1 (en) 1997-09-18
AU6634996A (en) 1996-11-18
JPH10503633A (en) 1998-03-31
IT1285178B1 (en) 1998-06-03
SE9604443L (en) 1997-02-19
BR9606292A (en) 1997-11-18
ITRM960235A1 (en) 1997-10-15
FI965131A (en) 1996-12-19
PL318012A1 (en) 1997-05-12
AU683058B2 (en) 1997-10-30
MX9606368A (en) 1997-03-29
WO1996034383A1 (en) 1996-10-31
FR2733345B1 (en) 1997-07-25
GB9625742D0 (en) 1997-01-29
FR2733345A1 (en) 1996-10-25
FI965131A0 (en) 1996-12-19
CN1150853A (en) 1997-05-28

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)