CA2037899A1 - Digital speech coder having improved long-term predictor - Google Patents

Digital speech coder having improved long-term predictor

Info

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
Application number
CA2037899A
Other languages
French (fr)
Other versions
CA2037899C (en
Inventor
Ira A. Gerson
Mark A. Jasiuk
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
Individual
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=23590969&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=CA2037899(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Individual filed Critical Individual
Publication of CA2037899A1 publication Critical patent/CA2037899A1/en
Application granted granted Critical
Publication of CA2037899C publication Critical patent/CA2037899C/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G10L19/04—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 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
    • G10L2019/0001—Codebooks
    • G10L2019/0011—Long term prediction filters, i.e. pitch estimation
    • 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
    • G10L2019/0001—Codebooks
    • G10L2019/0012—Smoothing of parameters of the decoder interpolation

Landscapes

  • Engineering & Computer Science (AREA)
  • Computational Linguistics (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Complex Calculations (AREA)
  • Analogue/Digital Conversion (AREA)
  • Near-Field Transmission Systems (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)

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).
CA002037899A 1989-09-01 1990-06-25 Digital speech coder having improved long-term predictor Expired - Lifetime CA2037899C (en)

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)

* Cited by examiner, † Cited by third party
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
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
FR2729244B1 (en) * 1995-01-06 1997-03-28 Matra Communication SYNTHESIS 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
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
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
GB2466674B (en) 2009-01-06 2013-11-13 Skype Speech coding
GB2466673B (en) 2009-01-06 2012-11-07 Skype Quantization
GB2466671B (en) 2009-01-06 2013-03-27 Skype Speech encoding
GB2466675B (en) 2009-01-06 2013-03-06 Skype Speech coding
GB2466672B (en) * 2009-01-06 2013-03-13 Skype Speech coding
CN104025191A (en) * 2011-10-18 2014-09-03 爱立信(中国)通信有限公司 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)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
JP3268360B2 (en) 2002-03-25
ES2145737T5 (en) 2007-03-01
DE69033510D1 (en) 2000-05-25
DK0450064T3 (en) 2000-10-02
CN1050633A (en) 1991-04-10
AU634795B2 (en) 1993-03-04
CN1026274C (en) 1994-10-19
EP0450064B1 (en) 2000-04-19
DK0450064T4 (en) 2006-09-04
JPH04502675A (en) 1992-05-14
CA2037899C (en) 1996-09-17
ATE191987T1 (en) 2000-05-15
AU5952590A (en) 1991-04-08
DE69033510T3 (en) 2007-06-06
EP0450064A4 (en) 1995-04-05
EP0450064B2 (en) 2006-08-09
MX167644B (en) 1993-03-31
DE69033510T2 (en) 2000-11-23
SG47028A1 (en) 1998-03-20
EP0450064A1 (en) 1991-10-09
ES2145737T3 (en) 2000-07-16
WO1991003790A1 (en) 1991-03-21

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