FR2796193B1 - AUDIO CODING METHOD AND DEVICE - Google Patents
AUDIO CODING METHOD AND DEVICEInfo
- Publication number
- FR2796193B1 FR2796193B1 FR9908637A FR9908637A FR2796193B1 FR 2796193 B1 FR2796193 B1 FR 2796193B1 FR 9908637 A FR9908637 A FR 9908637A FR 9908637 A FR9908637 A FR 9908637A FR 2796193 B1 FR2796193 B1 FR 2796193B1
- Authority
- FR
- France
- Prior art keywords
- cepstral
- audio signal
- spectrum
- cepstral coefficients
- fundamental frequency
- 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 - Fee Related
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
-
- 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
- G10L19/02—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 spectral analysis, e.g. transform vocoders or subband vocoders
-
- 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
- G10L19/08—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters
- G10L19/10—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters the excitation function being a multipulse excitation
Abstract
The invention concerns a method wherein the encoder estimates a fundamental frequency (F0) of an audio signal, and determines a compressed higher envelope of the spectrum of the signal by interpolation of the spectral amplitudes associated with multiple frequencies of the fundamental frequency with application of a spectral compression function. It transforms the compressed higher envelope in the cepstral domain to obtain cepstral coefficients (cx_sup), and includes in a digital flow transmitted to the decoder quantization data of said cepstral coefficients. The cepstral coefficients are transformed by liftering in the cepstral domain before they are quantized. A value of the spectrum module of the audio signal is recalculated at at least multiple frequency of the fundamental frequency on the basis of the transformed cepstral coefficients (cx-sup q), and the liftering is adapted so as to minimise the module difference between the audio signal spectrum and at least a recalculated module value.
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9908637A FR2796193B1 (en) | 1999-07-05 | 1999-07-05 | AUDIO CODING METHOD AND DEVICE |
AT00949620T ATE277402T1 (en) | 1999-07-05 | 2000-07-04 | AUDIO CODING WITH ADAPTIVE LIFT |
AU62919/00A AU6291900A (en) | 1999-07-05 | 2000-07-04 | Audio coding with adaptive liftering |
DE60014084T DE60014084D1 (en) | 1999-07-05 | 2000-07-04 | AUDIO CODING WITH ADAPTIVE LIFTERING |
PCT/FR2000/001905 WO2001003117A1 (en) | 1999-07-05 | 2000-07-04 | Audio coding with adaptive liftering |
EP00949620A EP1192618B1 (en) | 1999-07-05 | 2000-07-04 | Audio coding with adaptive liftering |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9908637A FR2796193B1 (en) | 1999-07-05 | 1999-07-05 | AUDIO CODING METHOD AND DEVICE |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2796193A1 FR2796193A1 (en) | 2001-01-12 |
FR2796193B1 true FR2796193B1 (en) | 2001-10-05 |
Family
ID=9547706
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR9908637A Expired - Fee Related FR2796193B1 (en) | 1999-07-05 | 1999-07-05 | AUDIO CODING METHOD AND DEVICE |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1192618B1 (en) |
AT (1) | ATE277402T1 (en) |
AU (1) | AU6291900A (en) |
DE (1) | DE60014084D1 (en) |
FR (1) | FR2796193B1 (en) |
WO (1) | WO2001003117A1 (en) |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03136100A (en) * | 1989-10-20 | 1991-06-10 | Canon Inc | Method and device for voice processing |
-
1999
- 1999-07-05 FR FR9908637A patent/FR2796193B1/en not_active Expired - Fee Related
-
2000
- 2000-07-04 AU AU62919/00A patent/AU6291900A/en not_active Abandoned
- 2000-07-04 EP EP00949620A patent/EP1192618B1/en not_active Expired - Lifetime
- 2000-07-04 AT AT00949620T patent/ATE277402T1/en not_active IP Right Cessation
- 2000-07-04 WO PCT/FR2000/001905 patent/WO2001003117A1/en active IP Right Grant
- 2000-07-04 DE DE60014084T patent/DE60014084D1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
AU6291900A (en) | 2001-01-22 |
EP1192618A1 (en) | 2002-04-03 |
FR2796193A1 (en) | 2001-01-12 |
ATE277402T1 (en) | 2004-10-15 |
WO2001003117A1 (en) | 2001-01-11 |
EP1192618B1 (en) | 2004-09-22 |
DE60014084D1 (en) | 2004-10-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1160770B2 (en) | Perceptual coding of audio signals using separated irrelevancy reduction and redundancy reduction | |
EP1080462B1 (en) | System and method for entropy encoding quantized transform coefficients of a signal | |
US6115689A (en) | Scalable audio coder and decoder | |
KR101019678B1 (en) | Low bit-rate audio coding | |
PT1334484E (en) | IMPROVING THE PERFORMANCE OF CODING SYSTEMS USING METHODS OF RECONSTRUCTION AT HIGH FREQUENCIES | |
IL216069A0 (en) | Audio coding system using characteristics of a decoded signal to adapt synthesized spectral components | |
WO2003077425A1 (en) | Digital signal encoding method, decoding method, encoding device, decoding device, digital signal encoding program, and decoding program | |
DE69521164T2 (en) | System for coding and decoding signals | |
EP1083674A3 (en) | Digital signal encoding device, its decoding device, and its recording medium | |
CA2194419A1 (en) | Perceptual noise shaping in the time domain via lpc prediction in the frequency domain | |
EP1073038A3 (en) | Bit allocation for subband audio coding without masking analysis | |
KR20030068716A (en) | Method for compressing audio signal using wavelet packet transform and apparatus thereof | |
JP2009512895A (en) | Signal coding and decoding based on spectral dynamics | |
GB2359468A (en) | Converting an audio signal between data compression formats | |
EP1139336A3 (en) | Determination of quantizaion coefficients for a subband audio encoder | |
CA2314421A1 (en) | Subband encoding and decoding system for data compression and decompression | |
FR2796193B1 (en) | AUDIO CODING METHOD AND DEVICE | |
WO2004066501A3 (en) | Coding system for minimizing digital data bandwidth | |
US9165561B2 (en) | Apparatus and method for processing voice signal | |
ES2125739T3 (en) | PROCEDURE TO CODE A DIGITALIZED AUDIO SIGNAL WITH A LOW SCAN SPEED. | |
JPH08179794A (en) | Sub-band coding method and device | |
WO1998035447A3 (en) | Audio coding method and apparatus | |
DE60014086D1 (en) | AUDIO CODING WITH HARMONIOUS COMPONENTS | |
GR20020100423A (en) | Signal compression method using the diiscrete orthogonal gauss-hermite transform |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
CA | Change of address | ||
CD | Change of name or company name | ||
ST | Notification of lapse |
Effective date: 20060331 |