DK2265041T3 - Avanceret behandling baseret på en kompleks-eksponentiel-moduleret filterbank og adaptive tidssignaleringsfremgangsmåder - Google Patents
Avanceret behandling baseret på en kompleks-eksponentiel-moduleret filterbank og adaptive tidssignaleringsfremgangsmåder Download PDFInfo
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- G—PHYSICS
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- 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
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- G—PHYSICS
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- 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
- G10L19/008—Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing
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- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H17/00—Networks using digital techniques
- H03H17/02—Frequency selective networks
- H03H17/0248—Filters characterised by a particular frequency response or filtering method
- H03H17/0264—Filter sets with mutual related characteristics
- H03H17/0266—Filter banks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S5/00—Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation
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- 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
- G10L19/0204—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 using subband decomposition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04S—STEREOPHONIC SYSTEMS
- H04S2420/00—Techniques used stereophonic systems covered by H04S but not provided for in its groups
- H04S2420/03—Application of parametric coding in stereophonic audio systems
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Claims (15)
- PAT E NT K RAV1. Apparat (102) til generering af et dekorrelationssignal ved anvendelse af et indgangssignal, omfattende: midler (101) til tilvejebringelse af en flerhed af underbåndsignaler, hvor et underbåndsignal indbefatter en rækkefølge af mindst to underbåndsampler, hvor rækkefølgen af underbåndsamplerne udgør en båndbredde af under-båndsignalet, der er mindre end en båndbredde af indgangssignalet; midler (201) til filtrering af hvert underbåndsignal ved anvendelse af et efterklangfilter for at opnå en flerhed af underbåndsignaler med efterklang; kendetegnet ved for hvert underbåndsignal af flerheden af underbåndsignaler midler (205) til estimering af en signalkarakteristik af et underbåndsignal; og for hvert underbåndsignal af flerheden af underbåndsignaler midler (204) til justering af et niveau af underbåndsignalet, hvor midlerne (204) til justering af et niveau af underbåndsignalet styres af midlerne (205) til estimering af en signalkarakteristik, hvor flerheden af underbåndsignaler med efterklang udgør dekorrelationssignalet.
- 2. Apparat ifølge krav 1, hvori midlerne (205) til estimering af en signalkarakteristik af et underbåndsignal er indrettet til at estimere en transient opførsel af underbåndsignalet, og hvori midlerne (204) til justering af et niveau af underbåndsignalet er indrettet til at reducere niveauet af underbåndsignalet under en transient gennemgang, der signaleres af midlerne (205) til estimering af en signalkarakteristik af et underbåndsignal.
- 3. Apparat ifølge krav 1 eller 2, hvori midlerne (201) til filtrering benyttes til at anvende en fraktioneret forsinkelse på et underbåndsignal, hvor den fraktionerede forsinkelse er større end ”0” og mindre end en samplingsperiode af underbåndsignalet.
- 4. Apparat ifølge et af de foregående krav, hvori midlerne (101) til tilvejebringelse af en flerhed af underbåndsignaler omfatter en QMF filterbank (QMF = Quadrature Mirror Filter) med en flerhed af QMF-kanaler, og hvori efterklangfilteret (201) benyttes til at anvende en faseforsinkelse med en faktor for hver QMF-kanal, der svarer til en konstant tidsforsinkelse.
- 5. Apparat ifølge et af de foregående krav, hvori efterklangfilteret (201) er tilpasset til at have forskellige sæt filterkoefficienter for hvert underbåndsignal.
- 6. Apparat ifølge et af de foregående krav, hvori midlerne (101) til tilvejebringelse af en flerhed af underbåndsignaler er indrettet til at tilvejebringe kritisk sam-plede underbåndsignaler.
- 7. Apparat ifølge et af de foregående krav, hvori midlerne (201) til filtrering af hvert underbåndsignal er indrettet til at anvende filtrene Η(ω) - exp(--«(>(·)[Vs(oj)(jMo) + ¥τ{ω + ")Gr (>a + π}\, hvor νΤ(ω) = Σπ£>(ω-7τ(2η+1 /2)), hvor b(oj) = βχρ(/Γω)|ν(ω)|2, V,(k) = /' ^pU)pU -T- Lk), hvor Vt(oj) er den diskrete tids-Fourier-transformation af ' hvor midlerne (101) til tilvejebringelse af en flerhed af underbåndsignaler omfatter en analysedel af en kompleks filterbank, hvor den komplekse filterbank omfatter en syntesedel af den komplekse filterbank, hvor L er et antal underbånd af syntesedelen af den komplekse filterbank, hvorn r=T/L, hvor T er en ønsket forsinkelse i sampleenheder af et udgangssignal, idet udgangssignalet omfatter en sum af signaler opnået fra en syntesefiltrering ved anvendelse af syntesedelen af den komplekse filterbank, hvor filteret Θτ{ω) er således, at lige indekserede impulssvarværdier er reelle værdier, og ulige indekserede impulssvarværdier er rent imaginære værdier, og hvor p(1) er et prototypefilter af den komplekse filterbank, og hvor 1 og k er indekser.
- 8. Multikanalafkoder til afkodning af et monosignal og et tilknyttet interkanalko-hærensmål, hvor interkanalkohærensmålet udgør en kohærens mellem en flerhed af originale kanaler, hvor monosignalet afledes af flerheden af originale kanaler, omfattende: en generator (102) til generering af et dekorrelationssignal fra monosignalet ifølge et af kravene 1 til 7; en blander (103, 104, 105, 106, 107, 108) til blanding af monosignalet og dekorrelationssignalet ifølge en første blandingsmodus for at opnå et første afkodet udgangssignal og ifølge en anden blandingsmodus for at opnå et andet afkodet udgangssignal, hvor blanderen benyttes til at bestemme den første blandingsmodus og den anden blandingsmodus baseret på interkanalkohærensmålet.
- 9. Multikanalafkoder ifølge krav 8, hvori blanderen benyttes til at iblande et un-derbånddomæne baseret på separate interkanalkohærensmål for forskellige underbånd, og som endvidere omfatter midler (109, 110) til konvertering det første og det andet afkodede udgangssignal fra underbånddomænet i tidsdomænet for at opnå et første og et andet afkodet tidsdomæneudgangssignal.
- 10. Multikanalafkoder ifølge krav 8 eller 9, hvori flerheden af originale kanaler indbefatter en venstre stereokanal og en højre stereokanal, og hvori det første afkodede udgangssignal er en afkodet venstre stereokanal, og hvori det andet afkodede udgangssignal er en afkodet højre stereokanal.
- 11. Multikanalafkoder ifølge et af kravene 7 til 9, hvori blanderen indbefatter midler (103, 106) til modifikation af et signalniveau af et underbånd af monosignalet eller midler (104) og (105) til modifikation af et signalniveau af underbåndet af dekorrelationssignalet.
- 12. Multikanalafkoder ifølge krav 10 eller 11, hvori blanderen indbefatter en tilføjelsesenhed (107) til tilføjelse af et modificeret underbånd af monosignalet og et modificeret underbånd af dekorrelationssignalet for at opnå et underbånd af en første afkodet udgangskanal eller den anden afkodede udgangskanal.
- 13. Fremgangsmåde til generering af et dekorrelationssignal ved anvendelse af et indgangssignal, omfattende: at tilvejebringe (101) en flerhed af underbåndsignaler, hvor et underbåndsig-nal indbefatter en rækkefølge af mindst to underbåndsampler, hvor rækkefølgen af underbåndsamplerne udgør en båndbredde af underbåndsignalet, der er mindre end en båndbredde af indgangssignalet; at filtrere (201) hvert underbåndsignal ved anvendelse af et efterklangfilter for at opnå en flerhed af underbåndsignaler med efterklang, hvor en flerhed underbåndsignaler med efterklang sammen udgør dekorrelationssignalet; kendetegnet ved for hvert underbåndsignal af flerheden af underbåndsignaler at estimere (205) en signalkarakteristik af et underbåndsignal; og for hvert underbåndsignal af flerheden af underbåndsignaler at justere (204) et niveau af underbåndsignalet, hvor trinet (204) med justering af et niveau af underbåndsignalet styres af trinet (205) med estimering af en signalkarakteristik, hvor flerheden af underbåndsignaler med efterklang udgør dekorrelationssignalet.
- 14. Fremgangsmåde til multikanalafkodning til afkodning af et monosignal og et tilknyttet interkanalkohærensmål, hvor interkanalkohærensmålet udgør en kohærens mellem en flerhed af originale kanaler, hvor monosignalet afledes af flerheden af originale kanaler, omfattende: at generere (102) et dekorrelationssignal fra monosignalet ifølge fremgangsmåden ifølge krav 13; at blande (103,104,105,106,107,108) monosignalet og dekorrelationssignalet ifølge en første blandingsmodus for at opnå jet første afkodet udgangssignal og ifølge en anden blandingsmodus for at opnå et andet afkodet udgangssignal, hvor blanderen benyttes til at bestemme den første blandingsmodus og den anden blandingsmodus baseret på interkanalkohærensmålet.
- 15. Computerprogam med en computerlæsbar kode til udøvelse af fremgangsmåden ifølge krav 13 eller fremgangsmåden ifølge krav 14, når det afvikles på en computer.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE0301273A SE0301273D0 (sv) | 2003-04-30 | 2003-04-30 | Advanced processing based on a complex-exponential-modulated filterbank and adaptive time signalling methods |
| EP06026639.2A EP1768454B1 (en) | 2003-04-30 | 2004-04-30 | Parametric coding of the stereo image of an audio signal |
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| Publication Number | Publication Date |
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| DK2265041T3 true DK2265041T3 (da) | 2018-03-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| DK17173334.8T DK3244638T3 (da) | 2003-04-30 | 2004-04-30 | Advanceret behandling baseret på en moduleret filterbank med kompleks eksponentialfunktion |
| DK17173333.0T DK3244637T3 (da) | 2003-04-30 | 2004-04-30 | Advanceret behandling baseret på en kompleks-eksponential-moduleret filterbank |
| DK17173337.1T DK3247135T3 (da) | 2003-04-30 | 2004-04-30 | Advanceret behandling baseret på en kompleks-eksponentiel-moduleret filterbank |
| DK10180688.3T DK2265041T3 (da) | 2003-04-30 | 2004-04-30 | Avanceret behandling baseret på en kompleks-eksponentiel-moduleret filterbank og adaptive tidssignaleringsfremgangsmåder |
| DK17173338.9T DK3244640T3 (da) | 2003-04-30 | 2004-04-30 | Advanceret behandling baseret på en kompleks-eksponential-moduleret filterbank |
| DK06026639.2T DK1768454T3 (da) | 2003-04-30 | 2004-04-30 | Parametrisk kodning af et audiosignals stereobillede |
| DK09009940.9T DK2124485T3 (da) | 2003-04-30 | 2004-04-30 | Avanceret behandling baseret på en kompleks-eksponentiel-moduleret filterbank og adaptive tidssignaleringsfremgangsmåder |
| DK10180679.2T DK2265040T3 (da) | 2003-04-30 | 2004-04-30 | Avanceret behandling baseret på en kompleks-eksponentiel-moduleret filterbank og adaptive tidssignaleringsfremgangsmåder |
| DK17173336.3T DK3244639T3 (da) | 2003-04-30 | 2004-04-30 | Advanceret behandling baseret på en kompleks-eksponential-moduleret filterbank og adaptive tidssignaleringsfremgangsmåder |
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| DK17173334.8T DK3244638T3 (da) | 2003-04-30 | 2004-04-30 | Advanceret behandling baseret på en moduleret filterbank med kompleks eksponentialfunktion |
| DK17173333.0T DK3244637T3 (da) | 2003-04-30 | 2004-04-30 | Advanceret behandling baseret på en kompleks-eksponential-moduleret filterbank |
| DK17173337.1T DK3247135T3 (da) | 2003-04-30 | 2004-04-30 | Advanceret behandling baseret på en kompleks-eksponentiel-moduleret filterbank |
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| Application Number | Title | Priority Date | Filing Date |
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| DK17173338.9T DK3244640T3 (da) | 2003-04-30 | 2004-04-30 | Advanceret behandling baseret på en kompleks-eksponential-moduleret filterbank |
| DK06026639.2T DK1768454T3 (da) | 2003-04-30 | 2004-04-30 | Parametrisk kodning af et audiosignals stereobillede |
| DK09009940.9T DK2124485T3 (da) | 2003-04-30 | 2004-04-30 | Avanceret behandling baseret på en kompleks-eksponentiel-moduleret filterbank og adaptive tidssignaleringsfremgangsmåder |
| DK10180679.2T DK2265040T3 (da) | 2003-04-30 | 2004-04-30 | Avanceret behandling baseret på en kompleks-eksponentiel-moduleret filterbank og adaptive tidssignaleringsfremgangsmåder |
| DK17173336.3T DK3244639T3 (da) | 2003-04-30 | 2004-04-30 | Advanceret behandling baseret på en kompleks-eksponential-moduleret filterbank og adaptive tidssignaleringsfremgangsmåder |
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| US (2) | US7487097B2 (da) |
| EP (12) | EP3244640B1 (da) |
| JP (2) | JP4527716B2 (da) |
| KR (1) | KR100717604B1 (da) |
| CN (3) | CN101071569B (da) |
| AT (1) | ATE444655T1 (da) |
| DE (1) | DE602004023381D1 (da) |
| DK (9) | DK3244638T3 (da) |
| ES (9) | ES2790886T3 (da) |
| PL (9) | PL2265040T3 (da) |
| SE (1) | SE0301273D0 (da) |
| WO (1) | WO2004097794A2 (da) |
Families Citing this family (62)
| Publication number | Priority date | Publication date | Assignee | Title |
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| SE0301273D0 (sv) * | 2003-04-30 | 2003-04-30 | Coding Technologies Sweden Ab | Advanced processing based on a complex-exponential-modulated filterbank and adaptive time signalling methods |
| EP1672618B1 (en) * | 2003-10-07 | 2010-12-15 | Panasonic Corporation | Method for deciding time boundary for encoding spectrum envelope and frequency resolution |
| KR20070065401A (ko) * | 2004-09-23 | 2007-06-22 | 코닌클리케 필립스 일렉트로닉스 엔.브이. | 오디오 데이터를 처리하는 시스템 및 방법, 프로그램구성요소, 및 컴퓨터-판독가능 매체 |
| KR100880646B1 (ko) * | 2005-08-30 | 2009-01-30 | 엘지전자 주식회사 | 오디오 신호의 인코딩 및 디코딩 장치, 및 방법 |
| CA2620627C (en) | 2005-08-30 | 2011-03-15 | Lg Electronics Inc. | Apparatus for encoding and decoding audio signal and method thereof |
| CN101253555B (zh) | 2005-09-01 | 2011-08-24 | 松下电器产业株式会社 | 多声道音频信号处理装置及多声道音频信号处理方法 |
| EP1927265A2 (en) | 2005-09-13 | 2008-06-04 | Koninklijke Philips Electronics N.V. | A method of and a device for generating 3d sound |
| WO2007080211A1 (en) * | 2006-01-09 | 2007-07-19 | Nokia Corporation | Decoding of binaural audio signals |
| KR100803212B1 (ko) | 2006-01-11 | 2008-02-14 | 삼성전자주식회사 | 스케일러블 채널 복호화 방법 및 장치 |
| US7711552B2 (en) * | 2006-01-27 | 2010-05-04 | Dolby International Ab | Efficient filtering with a complex modulated filterbank |
| KR100773560B1 (ko) | 2006-03-06 | 2007-11-05 | 삼성전자주식회사 | 스테레오 신호 생성 방법 및 장치 |
| EP1994796A1 (en) * | 2006-03-15 | 2008-11-26 | Dolby Laboratories Licensing Corporation | Binaural rendering using subband filters |
| EP1999997B1 (en) * | 2006-03-28 | 2011-04-13 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Enhanced method for signal shaping in multi-channel audio reconstruction |
| ATE527833T1 (de) | 2006-05-04 | 2011-10-15 | Lg Electronics Inc | Verbesserung von stereo-audiosignalen mittels neuabmischung |
| KR100763920B1 (ko) | 2006-08-09 | 2007-10-05 | 삼성전자주식회사 | 멀티채널 신호를 모노 또는 스테레오 신호로 압축한 입력신호를 2채널의 바이노럴 신호로 복호화하는 방법 및 장치 |
| JP5232791B2 (ja) | 2006-10-12 | 2013-07-10 | エルジー エレクトロニクス インコーポレイティド | ミックス信号処理装置及びその方法 |
| USRE50158E1 (en) | 2006-10-25 | 2024-10-01 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. | Apparatus and method for generating audio subband values and apparatus and method for generating time-domain audio samples |
| PL3848928T3 (pl) | 2006-10-25 | 2023-07-17 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Urządzenie i sposób do generowania wartości podpasm audio o wartościach zespolonych |
| JP5103880B2 (ja) * | 2006-11-24 | 2012-12-19 | 富士通株式会社 | 復号化装置および復号化方法 |
| DE102007018032B4 (de) * | 2007-04-17 | 2010-11-11 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Erzeugung dekorrelierter Signale |
| WO2008132850A1 (ja) * | 2007-04-25 | 2008-11-06 | Panasonic Corporation | ステレオ音声符号化装置、ステレオ音声復号装置、およびこれらの方法 |
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