GB8806185D0 - Speech coding - Google Patents
Speech codingInfo
- 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
Links
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)
- 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.
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)
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)
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 |
-
1988
- 1988-03-16 GB GB8806185A patent/GB8806185D0/en active Pending
-
1989
- 1989-03-14 EP EP89302481A patent/EP0333425A3/en not_active Ceased
Also Published As
Publication number | Publication date |
---|---|
EP0333425A2 (en) | 1989-09-20 |
EP0333425A3 (en) | 1990-02-07 |
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