AU6291900A - Audio coding with adaptive liftering - Google Patents
Audio coding with adaptive lifteringInfo
- Publication number
- AU6291900A AU6291900A AU62919/00A AU6291900A AU6291900A AU 6291900 A AU6291900 A AU 6291900A AU 62919/00 A AU62919/00 A AU 62919/00A AU 6291900 A AU6291900 A AU 6291900A AU 6291900 A AU6291900 A AU 6291900A
- Authority
- AU
- Australia
- Prior art keywords
- liftering
- cepstral
- audio signal
- spectrum
- cepstral coefficients
- 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.)
- Abandoned
Links
- 230000003044 adaptive effect Effects 0.000 title 1
- 230000005236 sound signal Effects 0.000 abstract 3
- 238000001228 spectrum Methods 0.000 abstract 3
- 230000003595 spectral effect Effects 0.000 abstract 2
- 230000006835 compression Effects 0.000 abstract 1
- 238000007906 compression Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 238000013139 quantization 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
-
- 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
- G10L19/02—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 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
- G10L19/08—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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Computational Linguistics (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Human Computer Interaction (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
- Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
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.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9908637A FR2796193B1 (en) | 1999-07-05 | 1999-07-05 | AUDIO CODING METHOD AND DEVICE |
| FR9908637 | 1999-07-05 | ||
| PCT/FR2000/001905 WO2001003117A1 (en) | 1999-07-05 | 2000-07-04 | Audio coding with adaptive liftering |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU6291900A true AU6291900A (en) | 2001-01-22 |
Family
ID=9547706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU62919/00A Abandoned AU6291900A (en) | 1999-07-05 | 2000-07-04 | Audio coding with adaptive liftering |
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 AT AT00949620T patent/ATE277402T1/en not_active IP Right Cessation
- 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 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 |
|---|---|
| WO2001003117A1 (en) | 2001-01-11 |
| ATE277402T1 (en) | 2004-10-15 |
| FR2796193B1 (en) | 2001-10-05 |
| EP1192618B1 (en) | 2004-09-22 |
| FR2796193A1 (en) | 2001-01-12 |
| EP1192618A1 (en) | 2002-04-03 |
| DE60014084D1 (en) | 2004-10-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MK6 | Application lapsed section 142(2)(f)/reg. 8.3(3) - pct applic. not entering national phase |