WO1991006093A1 - Digital speech decoder having a postfilter with reduced spectral distortion - Google Patents

Digital speech decoder having a postfilter with reduced spectral distortion Download PDF

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Publication number
WO1991006093A1
WO1991006093A1 PCT/US1990/005190 US9005190W WO9106093A1 WO 1991006093 A1 WO1991006093 A1 WO 1991006093A1 US 9005190 W US9005190 W US 9005190W WO 9106093 A1 WO9106093 A1 WO 9106093A1
Authority
WO
WIPO (PCT)
Prior art keywords
component
coefficients
postfilter
providing
parameters
Prior art date
Application number
PCT/US1990/005190
Other languages
English (en)
French (fr)
Inventor
Ira Alan Gerson
Mark Antoni Jasiuk
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.
Priority to EP90913916A priority Critical patent/EP0570362B1/en
Priority to DE69033011T priority patent/DE69033011T2/de
Publication of WO1991006093A1 publication Critical patent/WO1991006093A1/en

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
    • G10L19/26—Pre-filtering or post-filtering

Definitions

  • the numerator polynomial is only partially successful in tracking the spectral shape of the denominator (in effect, the spectral characteristic of the filter tilts with time), and that discrepancy typically manifests itself as a time varying modulation of the postfiltered speech brightness. Accordingly, a need exists for a method of postfiltering synthesized speech that will both enhance the perceptual quality of the synthetic speech, while simultaneously minimizing detrimental impact on speech brightness. Preferably, speech brightness itself will be better controlled as well.
  • the denominator and numerator are then used to characterize the adaptive spectral postfilter (108 ⁇ .

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)
  • Filters That Use Time-Delay Elements (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
PCT/US1990/005190 1989-10-17 1990-09-17 Digital speech decoder having a postfilter with reduced spectral distortion WO1991006093A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP90913916A EP0570362B1 (en) 1989-10-17 1990-09-17 Digital speech decoder having a postfilter with reduced spectral distortion
DE69033011T DE69033011T2 (de) 1989-10-17 1990-09-17 Digitaler sprachdekodierer unter verwendung einer nachfilterung mit einer reduzierten spektralverzerrung

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US42292689A 1989-10-17 1989-10-17
US422,926 1989-10-17

Publications (1)

Publication Number Publication Date
WO1991006093A1 true WO1991006093A1 (en) 1991-05-02

Family

ID=23676980

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1990/005190 WO1991006093A1 (en) 1989-10-17 1990-09-17 Digital speech decoder having a postfilter with reduced spectral distortion

Country Status (8)

Country Link
EP (1) EP0570362B1 (zh)
JP (1) JP3158434B2 (zh)
CN (1) CN1078371C (zh)
AT (1) ATE177867T1 (zh)
AU (1) AU635342B2 (zh)
DE (1) DE69033011T2 (zh)
ES (1) ES2131498T3 (zh)
WO (1) WO1991006093A1 (zh)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5899968A (en) * 1995-01-06 1999-05-04 Matra Corporation Speech coding method using synthesis analysis using iterative calculation of excitation weights
US5963898A (en) * 1995-01-06 1999-10-05 Matra Communications Analysis-by-synthesis speech coding method with truncation of the impulse response of a perceptual weighting filter
US5974377A (en) * 1995-01-06 1999-10-26 Matra Communication Analysis-by-synthesis speech coding method with open-loop and closed-loop search of a long-term prediction delay
US6058360A (en) * 1996-10-30 2000-05-02 Telefonaktiebolaget Lm Ericsson Postfiltering audio signals especially speech signals
US6137844A (en) * 1998-02-02 2000-10-24 Oki Telecom, Inc. Digital filter for noise and error removal in transmitted analog signals

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2993396B2 (ja) * 1995-05-12 1999-12-20 三菱電機株式会社 音声加工フィルタ及び音声合成装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4301329A (en) * 1978-01-09 1981-11-17 Nippon Electric Co., Ltd. Speech analysis and synthesis apparatus
US4617676A (en) * 1984-09-04 1986-10-14 At&T Bell Laboratories Predictive communication system filtering arrangement
US4817157A (en) * 1988-01-07 1989-03-28 Motorola, Inc. Digital speech coder having improved vector excitation source
US4852169A (en) * 1986-12-16 1989-07-25 GTE Laboratories, Incorporation Method for enhancing the quality of coded speech

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2535833B2 (ja) * 1986-07-03 1996-09-18 日本電気株式会社 集積回路
US4969192A (en) * 1987-04-06 1990-11-06 Voicecraft, Inc. Vector adaptive predictive coder for speech and audio

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4301329A (en) * 1978-01-09 1981-11-17 Nippon Electric Co., Ltd. Speech analysis and synthesis apparatus
US4617676A (en) * 1984-09-04 1986-10-14 At&T Bell Laboratories Predictive communication system filtering arrangement
US4852169A (en) * 1986-12-16 1989-07-25 GTE Laboratories, Incorporation Method for enhancing the quality of coded speech
US4817157A (en) * 1988-01-07 1989-03-28 Motorola, Inc. Digital speech coder having improved vector excitation source

Non-Patent Citations (6)

* Cited by examiner, † Cited by third party
Title
IEEE Journal on selected Areas in Communications, Vol. 6, No. 2, February 1988, KROON et al., "A Class of Analysis-by-Synthesis Predictive Coders for High Quality Speech Coding at Rates Between 4.8 and 16 Kbits/S", see entire document. *
IEEE Proceedings of the ICASSP, April 1986, JAYANT et al., "Adaptive Post filtering of 16 kb/s-ADPCM Speech", see entire document. *
IEEE Proceedings of the ICASSP, April 1988, KLEIJN et al., "Improved Speech Quality and Efficient Vector Quantization in SELP", see Abstract. *
IEEE Transactions on ASSP, Vol. ASSP-26, No. 6, December 1978, "Spectral Smoothing Technique in PARCOR Speech Analysis-Synthesis", see Abstract. *
IEEE, April 1987, CHEN et al., "Real-Time Vector APC Speech Coding at 4800bps with Adaptive Post filtering", see page 2185, right column; page 2186, right column and page 2188, figures 1,2 and 3. *
IEEE, April 1987, KROON et al., "Quantization Procedures for the Excitation in CELP Coders", see pages 1649, 1650 and 1652. *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5899968A (en) * 1995-01-06 1999-05-04 Matra Corporation Speech coding method using synthesis analysis using iterative calculation of excitation weights
US5963898A (en) * 1995-01-06 1999-10-05 Matra Communications Analysis-by-synthesis speech coding method with truncation of the impulse response of a perceptual weighting filter
US5974377A (en) * 1995-01-06 1999-10-26 Matra Communication Analysis-by-synthesis speech coding method with open-loop and closed-loop search of a long-term prediction delay
US6058360A (en) * 1996-10-30 2000-05-02 Telefonaktiebolaget Lm Ericsson Postfiltering audio signals especially speech signals
US6137844A (en) * 1998-02-02 2000-10-24 Oki Telecom, Inc. Digital filter for noise and error removal in transmitted analog signals

Also Published As

Publication number Publication date
EP0570362A4 (en) 1993-07-01
DE69033011D1 (de) 1999-04-22
AU635342B2 (en) 1993-03-18
EP0570362A1 (en) 1993-11-24
JPH05500573A (ja) 1993-02-04
DE69033011T2 (de) 2001-10-04
ES2131498T3 (es) 1999-08-01
AU6411490A (en) 1991-05-16
ATE177867T1 (de) 1999-04-15
EP0570362B1 (en) 1999-03-17
CN1051101A (zh) 1991-05-01
CN1078371C (zh) 2002-01-23
JP3158434B2 (ja) 2001-04-23

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