DE69033011D1 - DIGITAL VOICE DECODER USING A RE-FILTERING WITH A REDUCED SPECTRAL DISTORTION - Google Patents

DIGITAL VOICE DECODER USING A RE-FILTERING WITH A REDUCED SPECTRAL DISTORTION

Info

Publication number
DE69033011D1
DE69033011D1 DE69033011T DE69033011T DE69033011D1 DE 69033011 D1 DE69033011 D1 DE 69033011D1 DE 69033011 T DE69033011 T DE 69033011T DE 69033011 T DE69033011 T DE 69033011T DE 69033011 D1 DE69033011 D1 DE 69033011D1
Authority
DE
Germany
Prior art keywords
filtering
digital voice
spectral distortion
voice decoder
denominator
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.)
Expired - Lifetime
Application number
DE69033011T
Other languages
German (de)
Other versions
DE69033011T2 (en
Inventor
Ira Gerson
Mark 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
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
Application granted granted Critical
Publication of DE69033011D1 publication Critical patent/DE69033011D1/en
Publication of DE69033011T2 publication Critical patent/DE69033011T2/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
    • G10L19/26—Pre-filtering or post-filtering

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)

Abstract

An adaptive spectral postfilter (108) in a synthesized speech platform has a denominator characteristic that corresponds to a preceding LPC filter stage (106) and a numerator characteristic that is developed as a function of the denominator characteristic through application of spectral smoothing techniques. This allows the numerator to track the denominator without the introduction of spectral distortion that would otherwise affect the processing in an adverse way.
DE69033011T 1989-10-17 1990-09-17 DIGITAL VOICE DECODER USING A RE-FILTERING WITH A REDUCED SPECTRAL DISTORTION Expired - Lifetime DE69033011T2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US42292689A 1989-10-17 1989-10-17
PCT/US1990/005190 WO1991006093A1 (en) 1989-10-17 1990-09-17 Digital speech decoder having a postfilter with reduced spectral distortion

Publications (2)

Publication Number Publication Date
DE69033011D1 true DE69033011D1 (en) 1999-04-22
DE69033011T2 DE69033011T2 (en) 2001-10-04

Family

ID=23676980

Family Applications (1)

Application Number Title Priority Date Filing Date
DE69033011T Expired - Lifetime DE69033011T2 (en) 1989-10-17 1990-09-17 DIGITAL VOICE DECODER USING A RE-FILTERING WITH A REDUCED SPECTRAL DISTORTION

Country Status (8)

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

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
JP2993396B2 (en) * 1995-05-12 1999-12-20 三菱電機株式会社 Voice processing filter and voice synthesizer
DE19643900C1 (en) * 1996-10-30 1998-02-12 Ericsson Telefon Ab L M Audio signal post filter, especially for speech signals
US6137844A (en) * 1998-02-02 2000-10-24 Oki Telecom, Inc. Digital filter for noise and error removal in transmitted analog signals

Family Cites Families (6)

* 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
JP2535833B2 (en) * 1986-07-03 1996-09-18 日本電気株式会社 Integrated circuit
US4852169A (en) * 1986-12-16 1989-07-25 GTE Laboratories, Incorporation Method for enhancing the quality of coded speech
US4969192A (en) * 1987-04-06 1990-11-06 Voicecraft, Inc. Vector adaptive predictive coder for speech and audio
US4817157A (en) * 1988-01-07 1989-03-28 Motorola, Inc. Digital speech coder having improved vector excitation source

Also Published As

Publication number Publication date
JPH05500573A (en) 1993-02-04
AU6411490A (en) 1991-05-16
CN1078371C (en) 2002-01-23
CN1051101A (en) 1991-05-01
AU635342B2 (en) 1993-03-18
EP0570362A1 (en) 1993-11-24
JP3158434B2 (en) 2001-04-23
WO1991006093A1 (en) 1991-05-02
DE69033011T2 (en) 2001-10-04
ES2131498T3 (en) 1999-08-01
ATE177867T1 (en) 1999-04-15
EP0570362B1 (en) 1999-03-17
EP0570362A4 (en) 1993-07-01

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Legal Events

Date Code Title Description
8332 No legal effect for de
8328 Change in the person/name/address of the agent

Free format text: MARKUS A. RICHARDT, DR. LOTHAR PFEIFER, 65203 WIESBADEN

8370 Indication related to discontinuation of the patent is to be deleted
8328 Change in the person/name/address of the agent

Free format text: SCHUMACHER & WILLSAU, PATENTANWALTSSOZIETAET, 80335 MUENCHEN