GB8806185D0 - Speech coding - Google Patents

Speech coding

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Publication number
GB8806185D0
GB8806185D0 GB8806185A GB8806185A GB8806185D0 GB 8806185 D0 GB8806185 D0 GB 8806185D0 GB 8806185 A GB8806185 A GB 8806185A GB 8806185 A GB8806185 A GB 8806185A GB 8806185 D0 GB8806185 D0 GB 8806185D0
Authority
GB
United Kingdom
Prior art keywords
sequence
lpc
output
telecommunications link
vector quantizer
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.)
Pending
Application number
GB8806185A
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.)
University of Surrey
Original Assignee
University of Surrey
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 University of Surrey filed Critical University of Surrey
Priority to GB8806185A priority Critical patent/GB8806185D0/en
Publication of GB8806185D0 publication Critical patent/GB8806185D0/en
Priority to EP89302481A priority patent/EP0333425A3/en
Pending legal-status Critical Current

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  • 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)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)

Abstract

Speech for transmission over a low bit rate channel of a telecommunications link is digitally sampled and subjected to linear predictive coding in a coder (6). The LPC residual signal is passed through a weighting filter (18) and the output down sampled by decimation factor d resulting in d sequences of which the maximum energy sequence is selected for vector quantization. The data output from the vector quantizer (22) is formed into an output frame together with an index (s) identifying the selected decimation sequence and the quantized LPC parameters. The frame transmitted over the telecommunications link (46) is decoded by means of an inverse vector quantizer (50) which restores the decimated sequence. An interpolator (52) interpolates zeros to restore an excitation signal for an LPC synthesis filter (54) from which the voice signal can be reconstructed.
GB8806185A 1988-03-16 1988-03-16 Speech coding Pending GB8806185D0 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB8806185A GB8806185D0 (en) 1988-03-16 1988-03-16 Speech coding
EP89302481A EP0333425A3 (en) 1988-03-16 1989-03-14 Speech coding

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8806185A GB8806185D0 (en) 1988-03-16 1988-03-16 Speech coding

Publications (1)

Publication Number Publication Date
GB8806185D0 true GB8806185D0 (en) 1988-04-13

Family

ID=10633500

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8806185A Pending GB8806185D0 (en) 1988-03-16 1988-03-16 Speech coding

Country Status (2)

Country Link
EP (1) EP0333425A3 (en)
GB (1) GB8806185D0 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3254687B2 (en) * 1991-02-26 2002-02-12 日本電気株式会社 Audio coding method
ES2042410B1 (en) * 1992-04-15 1997-01-01 Control Sys S A ENCODING METHOD AND VOICE ENCODER FOR EQUIPMENT AND COMMUNICATION SYSTEMS.
GB9512284D0 (en) * 1995-06-16 1995-08-16 Nokia Mobile Phones Ltd Speech Synthesiser

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4731846A (en) * 1983-04-13 1988-03-15 Texas Instruments Incorporated Voice messaging system with pitch tracking based on adaptively filtered LPC residual signal

Also Published As

Publication number Publication date
EP0333425A2 (en) 1989-09-20
EP0333425A3 (en) 1990-02-07

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