CA2037899A1 - Digital speech coder having improved long-term predictor - Google Patents
Digital speech coder having improved long-term predictorInfo
- Publication number
- CA2037899A1 CA2037899A1 CA2037899A CA2037899A CA2037899A1 CA 2037899 A1 CA2037899 A1 CA 2037899A1 CA 2037899 A CA2037899 A CA 2037899A CA 2037899 A CA2037899 A CA 2037899A CA 2037899 A1 CA2037899 A1 CA 2037899A1
- Authority
- CA
- Canada
- Prior art keywords
- long
- term
- term predictor
- vector
- delayed
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; 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
- G10L19/08—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters
- G10L19/12—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters the excitation function being a code excitation, e.g. in code excited linear prediction [CELP] vocoders
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; 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
- G10L2019/0001—Codebooks
- G10L2019/0011—Long term prediction filters, i.e. pitch estimation
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; 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
- G10L2019/0001—Codebooks
- G10L2019/0012—Smoothing of parameters of the decoder interpolation
Abstract
A digital speech coder includes a long-term filter (124) having an improved sub-sample resolution long-term predictor (Figure 5) which allows for subsample resolution for the lag parameter L. A frame of N samples of input speech vector s(n) is applied to an adder (510). The output of the adder (510) produces the output vector b(n) for the long term filter (124). The output vector b(n) is fed back to a delayed vector generator block (530) of the long-term predictor. The nominal long-term predictor lag parameter L is also input to the delayed vector generator block (530). The long-term predictor lag parameter L can take on non-integer values, which may be multiples of one half, one third, one fourth or any other rational fraction. The delayed vector generator (530) includes a memory which holds past samples of b(n). In addition, interpolated samples of b(n) are also calculated by the delayed vector generator (530) and stored in its memory, at least one interpolated sample being calculated and stored between each past sample of b(n). The delayed vector generator (530) provides output vector q(n) to the long-term multiplier block (520), which scales the long-term predictor response by the long-term predictor coefficient .beta.. The scaled output .beta.q(n) is then applied to the adder (510) to complete the feedback loop of the recursive filter (124).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US40220689A | 1989-09-01 | 1989-09-01 | |
US402,206 | 1989-09-01 |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2037899A1 true CA2037899A1 (en) | 1991-03-02 |
CA2037899C CA2037899C (en) | 1996-09-17 |
Family
ID=23590969
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002037899A Expired - Lifetime CA2037899C (en) | 1989-09-01 | 1990-06-25 | Digital speech coder having improved long-term predictor |
Country Status (12)
Country | Link |
---|---|
EP (1) | EP0450064B2 (en) |
JP (1) | JP3268360B2 (en) |
CN (1) | CN1026274C (en) |
AT (1) | ATE191987T1 (en) |
AU (1) | AU634795B2 (en) |
CA (1) | CA2037899C (en) |
DE (1) | DE69033510T3 (en) |
DK (1) | DK0450064T4 (en) |
ES (1) | ES2145737T5 (en) |
MX (1) | MX167644B (en) |
SG (1) | SG47028A1 (en) |
WO (1) | WO1991003790A1 (en) |
Families Citing this family (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5327520A (en) * | 1992-06-04 | 1994-07-05 | At&T Bell Laboratories | Method of use of voice message coder/decoder |
FR2702590B1 (en) * | 1993-03-12 | 1995-04-28 | Dominique Massaloux | Device for digital coding and decoding of speech, method for exploring a pseudo-logarithmic dictionary of LTP delays, and method for LTP analysis. |
FI96248C (en) | 1993-05-06 | 1996-05-27 | Nokia Mobile Phones Ltd | Method for providing a synthetic filter for long-term interval and synthesis filter for speech coder |
DE4421853A1 (en) * | 1994-06-22 | 1996-01-04 | Philips Patentverwaltung | Mobile terminal |
GB9408037D0 (en) * | 1994-04-22 | 1994-06-15 | Philips Electronics Uk Ltd | Analogue signal coder |
JP2970407B2 (en) * | 1994-06-21 | 1999-11-02 | 日本電気株式会社 | Speech excitation signal encoding device |
FR2729244B1 (en) * | 1995-01-06 | 1997-03-28 | Matra Communication | SYNTHESIS ANALYSIS SPEECH CODING METHOD |
FR2729246A1 (en) * | 1995-01-06 | 1996-07-12 | Matra Communication | SYNTHETIC ANALYSIS-SPEECH CODING METHOD |
FR2729247A1 (en) * | 1995-01-06 | 1996-07-12 | Matra Communication | SYNTHETIC ANALYSIS-SPEECH CODING METHOD |
US5708757A (en) * | 1996-04-22 | 1998-01-13 | France Telecom | Method of determining parameters of a pitch synthesis filter in a speech coder, and speech coder implementing such method |
JP4857467B2 (en) | 2001-01-25 | 2012-01-18 | ソニー株式会社 | Data processing apparatus, data processing method, program, and recording medium |
JP4857468B2 (en) * | 2001-01-25 | 2012-01-18 | ソニー株式会社 | Data processing apparatus, data processing method, program, and recording medium |
GB2466672B (en) * | 2009-01-06 | 2013-03-13 | Skype | Speech coding |
GB2466671B (en) | 2009-01-06 | 2013-03-27 | Skype | Speech encoding |
GB2466675B (en) | 2009-01-06 | 2013-03-06 | Skype | Speech coding |
GB2466673B (en) | 2009-01-06 | 2012-11-07 | Skype | Quantization |
GB2466674B (en) | 2009-01-06 | 2013-11-13 | Skype | Speech coding |
WO2013056388A1 (en) * | 2011-10-18 | 2013-04-25 | Telefonaktiebolaget L M Ericsson (Publ) | An improved method and apparatus for adaptive multi rate codec |
FR3015754A1 (en) * | 2013-12-20 | 2015-06-26 | Orange | RE-SAMPLING A CADENCE AUDIO SIGNAL AT A VARIABLE SAMPLING FREQUENCY ACCORDING TO THE FRAME |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL168669C (en) * | 1974-09-16 | 1982-04-16 | Philips Nv | INTERPOLING DIGITAL FILTER WITH INPUT BUFFER. |
US4080660A (en) * | 1975-07-11 | 1978-03-21 | James Nickolas Constant | Digital signal time scale inversion |
US4020332A (en) * | 1975-09-24 | 1977-04-26 | Bell Telephone Laboratories, Incorporated | Interpolation-decimation circuit for increasing or decreasing digital sampling frequency |
NL8105801A (en) * | 1981-12-23 | 1983-07-18 | Philips Nv | RECURSIVE DIGITAL FILTER. |
US4573135A (en) * | 1983-04-25 | 1986-02-25 | Rca Corporation | Digital lowpass filter having controllable gain |
JPS60116000A (en) * | 1983-11-28 | 1985-06-22 | ケイディディ株式会社 | Voice encoding system |
JPS63214032A (en) * | 1987-03-02 | 1988-09-06 | Fujitsu Ltd | Coding transmitter |
JPS63249200A (en) * | 1987-04-06 | 1988-10-17 | 日本電信電話株式会社 | Vector quantization system |
JPH01177227A (en) * | 1988-01-05 | 1989-07-13 | Toshiba Corp | Sound coder and decoder |
-
1990
- 1990-06-25 SG SG1996002783A patent/SG47028A1/en unknown
- 1990-06-25 CA CA002037899A patent/CA2037899C/en not_active Expired - Lifetime
- 1990-06-25 EP EP91905041A patent/EP0450064B2/en not_active Expired - Lifetime
- 1990-06-25 AU AU59525/90A patent/AU634795B2/en not_active Expired
- 1990-06-25 JP JP50964190A patent/JP3268360B2/en not_active Expired - Lifetime
- 1990-06-25 WO PCT/US1990/003625 patent/WO1991003790A1/en active IP Right Grant
- 1990-06-25 DK DK91905041T patent/DK0450064T4/en active
- 1990-06-25 ES ES91905041T patent/ES2145737T5/en not_active Expired - Lifetime
- 1990-06-25 AT AT91905041T patent/ATE191987T1/en not_active IP Right Cessation
- 1990-06-25 DE DE69033510T patent/DE69033510T3/en not_active Expired - Lifetime
- 1990-08-15 MX MX021980A patent/MX167644B/en unknown
- 1990-08-31 CN CN90109233A patent/CN1026274C/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0450064B1 (en) | 2000-04-19 |
SG47028A1 (en) | 1998-03-20 |
MX167644B (en) | 1993-03-31 |
EP0450064B2 (en) | 2006-08-09 |
EP0450064A4 (en) | 1995-04-05 |
DK0450064T4 (en) | 2006-09-04 |
ES2145737T5 (en) | 2007-03-01 |
DK0450064T3 (en) | 2000-10-02 |
JP3268360B2 (en) | 2002-03-25 |
CN1026274C (en) | 1994-10-19 |
DE69033510D1 (en) | 2000-05-25 |
CA2037899C (en) | 1996-09-17 |
ES2145737T3 (en) | 2000-07-16 |
DE69033510T3 (en) | 2007-06-06 |
EP0450064A1 (en) | 1991-10-09 |
CN1050633A (en) | 1991-04-10 |
WO1991003790A1 (en) | 1991-03-21 |
AU634795B2 (en) | 1993-03-04 |
JPH04502675A (en) | 1992-05-14 |
AU5952590A (en) | 1991-04-08 |
DE69033510T2 (en) | 2000-11-23 |
ATE191987T1 (en) | 2000-05-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKEX | Expiry |