ATE177867T1 - DIGITAL SPEECH DECODER USING POST-FILTERING WITH REDUCED SPECTRACT DISTORTION - Google Patents

DIGITAL SPEECH DECODER USING POST-FILTERING WITH REDUCED SPECTRACT DISTORTION

Info

Publication number
ATE177867T1
ATE177867T1 AT90913916T AT90913916T ATE177867T1 AT E177867 T1 ATE177867 T1 AT E177867T1 AT 90913916 T AT90913916 T AT 90913916T AT 90913916 T AT90913916 T AT 90913916T AT E177867 T1 ATE177867 T1 AT E177867T1
Authority
AT
Austria
Prior art keywords
distortion
spectract
filtering
post
reduced
Prior art date
Application number
AT90913916T
Other languages
German (de)
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
Application granted granted Critical
Publication of ATE177867T1 publication Critical patent/ATE177867T1/en

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

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.
AT90913916T 1989-10-17 1990-09-17 DIGITAL SPEECH DECODER USING POST-FILTERING WITH REDUCED SPECTRACT DISTORTION ATE177867T1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US42292689A 1989-10-17 1989-10-17

Publications (1)

Publication Number Publication Date
ATE177867T1 true ATE177867T1 (en) 1999-04-15

Family

ID=23676980

Family Applications (1)

Application Number Title Priority Date Filing Date
AT90913916T ATE177867T1 (en) 1989-10-17 1990-09-17 DIGITAL SPEECH DECODER USING POST-FILTERING WITH REDUCED SPECTRACT 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
FR2729247A1 (en) * 1995-01-06 1996-07-12 Matra Communication SYNTHETIC ANALYSIS-SPEECH CODING METHOD
FR2729246A1 (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
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
DE69033011T2 (en) 2001-10-04
AU6411490A (en) 1991-05-16
CN1051101A (en) 1991-05-01
EP0570362B1 (en) 1999-03-17
JPH05500573A (en) 1993-02-04
DE69033011D1 (en) 1999-04-22
ES2131498T3 (en) 1999-08-01
EP0570362A1 (en) 1993-11-24
JP3158434B2 (en) 2001-04-23
WO1991006093A1 (en) 1991-05-02
CN1078371C (en) 2002-01-23
AU635342B2 (en) 1993-03-18
EP0570362A4 (en) 1993-07-01

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Legal Events

Date Code Title Description
RER Ceased as to paragraph 5 lit. 3 law introducing patent treaties
EEWE Authorization for restitution
EELA Cancelled due to lapse of time