ATE177867T1 - DIGITAL SPEECH DECODER USING POST-FILTERING WITH REDUCED SPECTRACT DISTORTION - Google Patents
DIGITAL SPEECH DECODER USING POST-FILTERING WITH REDUCED SPECTRACT DISTORTIONInfo
- 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
Links
- 238000001914 filtration Methods 0.000 title 1
- 230000003595 spectral effect Effects 0.000 abstract 3
- 230000003044 adaptive effect Effects 0.000 abstract 1
- 230000002411 adverse Effects 0.000 abstract 1
- 238000009499 grossing Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
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.
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
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)
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 |
-
1990
- 1990-09-17 AT AT90913916T patent/ATE177867T1/en not_active IP Right Cessation
- 1990-09-17 WO PCT/US1990/005190 patent/WO1991006093A1/en active IP Right Grant
- 1990-09-17 EP EP90913916A patent/EP0570362B1/en not_active Expired - Lifetime
- 1990-09-17 JP JP51307390A patent/JP3158434B2/en not_active Expired - Lifetime
- 1990-09-17 DE DE69033011T patent/DE69033011T2/en not_active Expired - Lifetime
- 1990-09-17 ES ES90913916T patent/ES2131498T3/en not_active Expired - Lifetime
- 1990-09-17 AU AU64114/90A patent/AU635342B2/en not_active Expired
- 1990-10-15 CN CN90108435.2A patent/CN1078371C/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH05500573A (en) | 1993-02-04 |
EP0570362B1 (en) | 1999-03-17 |
AU635342B2 (en) | 1993-03-18 |
ES2131498T3 (en) | 1999-08-01 |
AU6411490A (en) | 1991-05-16 |
DE69033011D1 (en) | 1999-04-22 |
CN1078371C (en) | 2002-01-23 |
EP0570362A1 (en) | 1993-11-24 |
EP0570362A4 (en) | 1993-07-01 |
WO1991006093A1 (en) | 1991-05-02 |
JP3158434B2 (en) | 2001-04-23 |
DE69033011T2 (en) | 2001-10-04 |
CN1051101A (en) | 1991-05-01 |
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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 |