EP2380169A1 - Verfahren und mittel zur skalierbaren verbesserung der qualität eines signalcodierverfahrens - Google Patents
Verfahren und mittel zur skalierbaren verbesserung der qualität eines signalcodierverfahrensInfo
- Publication number
- EP2380169A1 EP2380169A1 EP09807441A EP09807441A EP2380169A1 EP 2380169 A1 EP2380169 A1 EP 2380169A1 EP 09807441 A EP09807441 A EP 09807441A EP 09807441 A EP09807441 A EP 09807441A EP 2380169 A1 EP2380169 A1 EP 2380169A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- signal
- reference signals
- error signal
- pulses
- quality
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000012804 iterative process Methods 0.000 claims abstract description 3
- 238000004393 prognosis Methods 0.000 claims abstract description 3
- 230000003044 adaptive effect Effects 0.000 claims description 5
- 230000001419 dependent effect Effects 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 description 6
- 238000005070 sampling Methods 0.000 description 5
- 230000005236 sound signal Effects 0.000 description 5
- VKZRWSNIWNFCIQ-WDSKDSINSA-N (2s)-2-[2-[[(1s)-1,2-dicarboxyethyl]amino]ethylamino]butanedioic acid Chemical compound OC(=O)C[C@@H](C(O)=O)NCCN[C@H](C(O)=O)CC(O)=O VKZRWSNIWNFCIQ-WDSKDSINSA-N 0.000 description 1
- 101150072497 EDS1 gene Proteins 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
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
- G10L19/16—Vocoder architecture
- G10L19/18—Vocoders using multiple modes
- G10L19/24—Variable rate codecs, e.g. for generating different qualities using a scalable representation such as hierarchical encoding or layered encoding
Definitions
- the invention relates to a method for the scalable improvement of the quality of a signal coding method
- the audio signals to be transmitted are compressed by means of coding methods and decompressed after the transmission.
- Such a coding method which is intended for transmission of a speech signal in a frequency range of 300 to 3400 Hz with a data rate of 8 kbit / s, is known, for example, from ITU-T Recommendation G.729.
- the transmission of an extended frequency range from 50 Hz to
- a so-called broadband voice codec provided for this purpose is, for example, in ITU-T Recommendation G.722. EV described.
- the method uses subband adaptive differential pulse code modulation (SB-ADPCM) to encode audio signals.
- SB-ADPCM subband adaptive differential pulse code modulation
- the invention has for its object to provide a method for scalable improvement of the quality of a coding method according to the Subband Adaptive Differential Pulse Code principle.
- the information about the reference signal with the minimum error signal is transmitted.
- FIG. 2 shows the structure of a codec according to the invention
- FIG. 3 shows the structure of a decoder according to the invention.
- the reference signal according to FIG. 1 comprises a number of N discrete pulses ⁇ ⁇ n).
- the Dirac pulses may have a predetermined number of amplitude values L.
- FIG. 2 shows the structural design of an encoder according to the invention which, in addition to a conventional coder ADPCM according to the Subband Adaptive Differential Pulse Code principle according to IT-U Recommendation G.722, comprises means for generating reference signals which each have one for each stage of the extension Signal generator EHDSl, ... EHDSS for generating the reference signals c (n) and a control unit CB 1, ... CB S has.
- the reference signals c (n) are compared with a digital error signal e H over a predetermined time interval, a so-called frame, which in a conventional coding method corresponds to IT-U recommen- tion G.722 was determined from an input signal to be coded and a prognosis signal.
- the reference signal c (n) with the lowest error amount E n is now determined and the information about this signal is transmitted as additional information I ⁇ imin f • ⁇ iHSmin and used in the receiver for decoding the useful signal ,
- the starting point is a sampling rate of 8 KHz and thus a duration of a sampling interval of 125 ⁇ sec.
- the duration of a comparison section is 5 msec, the number of possible amplitude values L for the Dirac pulses is 2.
- Fig. 3 shows the structure of a decoder according to the invention in the received signal from the I H, Im, IH 2 - the audio signal is obtained I HS - -.
- the received signal includes the recovered with the invention, additional information Inimm / • • • I HS ⁇ H ⁇ depending on the number of selected channels in the expansion stages.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ATA1982/2008A AT509439B1 (de) | 2008-12-19 | 2008-12-19 | Verfahren und mittel zur skalierbaren verbesserung der qualität eines signalcodierverfahrens |
PCT/EP2009/008853 WO2010069513A1 (de) | 2008-12-19 | 2009-12-10 | Verfahren und mittel zur skalierbaren verbesserung der qualität eines signalcodierverfahrens |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2380169A1 true EP2380169A1 (de) | 2011-10-26 |
EP2380169B1 EP2380169B1 (de) | 2015-12-09 |
Family
ID=41812891
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09807441.2A Active EP2380169B1 (de) | 2008-12-19 | 2009-12-10 | Verfahren und mittel zur skalierbaren verbesserung der qualität eines signalcodierverfahrens |
Country Status (6)
Country | Link |
---|---|
US (1) | US8774312B2 (de) |
EP (1) | EP2380169B1 (de) |
CN (1) | CN102257565B (de) |
AT (1) | AT509439B1 (de) |
BR (1) | BRPI0922993A2 (de) |
WO (1) | WO2010069513A1 (de) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2481026B1 (de) * | 1980-04-21 | 1984-06-15 | France Etat | |
JP2598159B2 (ja) * | 1990-08-28 | 1997-04-09 | 三菱電機株式会社 | 音声信号処理装置 |
US5956674A (en) * | 1995-12-01 | 1999-09-21 | Digital Theater Systems, Inc. | Multi-channel predictive subband audio coder using psychoacoustic adaptive bit allocation in frequency, time and over the multiple channels |
KR100711989B1 (ko) * | 2002-03-12 | 2007-05-02 | 노키아 코포레이션 | 효율적으로 개선된 스케일러블 오디오 부호화 |
KR100467326B1 (ko) * | 2002-12-09 | 2005-01-24 | 학교법인연세대학교 | 추가 비트 할당 기법을 이용한 음성 부호화 및 복호화를위한 송수신기 |
-
2008
- 2008-12-19 AT ATA1982/2008A patent/AT509439B1/de not_active IP Right Cessation
-
2009
- 2009-12-10 US US13/133,978 patent/US8774312B2/en active Active
- 2009-12-10 BR BRPI0922993A patent/BRPI0922993A2/pt not_active Application Discontinuation
- 2009-12-10 EP EP09807441.2A patent/EP2380169B1/de active Active
- 2009-12-10 CN CN2009801510367A patent/CN102257565B/zh not_active Expired - Fee Related
- 2009-12-10 WO PCT/EP2009/008853 patent/WO2010069513A1/de active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2010069513A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN102257565B (zh) | 2013-05-29 |
EP2380169B1 (de) | 2015-12-09 |
AT509439A1 (de) | 2011-08-15 |
CN102257565A (zh) | 2011-11-23 |
US20120014474A1 (en) | 2012-01-19 |
WO2010069513A1 (de) | 2010-06-24 |
AT509439B1 (de) | 2013-05-15 |
BRPI0922993A2 (pt) | 2016-01-26 |
US8774312B2 (en) | 2014-07-08 |
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