DK2981963T3 - Kompressionsapparat og fremsgangsmåde til at reducere kvantiseringsstøj ved brug af avanceret spektraludvidelse - Google Patents
Kompressionsapparat og fremsgangsmåde til at reducere kvantiseringsstøj ved brug af avanceret spektraludvidelse Download PDFInfo
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- DK2981963T3 DK2981963T3 DK14720877.1T DK14720877T DK2981963T3 DK 2981963 T3 DK2981963 T3 DK 2981963T3 DK 14720877 T DK14720877 T DK 14720877T DK 2981963 T3 DK2981963 T3 DK 2981963T3
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- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
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Claims (15)
1. Fremgangsmåde til at ekspandere et audiosignal, der omfatter: at modtage et audiosignal; og at ekspandere audiosignalet til et ekspanderet dynamisk område gennem en ekspansionsfremgangsmåde, der omfatter: at opdele den modtagne audiosignal i et antal tidssegmenter ved at benytte en defineret form af vinduet, at beregne en bredbåndsforstærkning for hvert tidssegment i frekvensdomænet ved at benytte et ikke-energibaseret gennemsnit af en frekvensdomænerepræsentation af audiosignalet, og at anvende individuelle forstærkningsværdier til hvert tidssegment for at opnå audiosignalet i det ekspanderede dynamisk område, hvor anvendelsen af de individuelle forstærkningsværdier forstærker segmenter af relativt høj intensitet og dæmper segmenter af relativt lav intensitet.
2. Fremgangsmåden ifølge krav 1, hvor segmenterne lapper over.
3. Fremgangsmåden ifølge krav 2, hvor en første filterbank benyttes til at analysere audiosignalet for at opnå frekvensdomænerepræsentationen, og den definerede form af vinduet svarer til et prototypefilter for den første filterbank.
4. Fremgangsmåden ifølge krav 3, hvor den første filterbank er en af en kvadraturmoduleret filter(QMF)bank eller en korttids-Fourier-transformation.
5. Fremgangsmåden ifølge krav 3, hvor bredbåndsforstærkningen for hvert tidssegment er beregnet ved at benytte prøver fra underbånd i en undergruppe af underbånd i det respektive tidssegment.
6. Fremgangsmåden ifølge krav 5, hvor undergruppen af underbånd svarer til hele frekvensområdet, der er udspændt af den første filterbank.
7. Fremgangsmåde til at komprimere et audiosignal, der omfatter: at modtage af et indledende audiosignal; og at komprimere det indledende audiosignal for væsentligt at reducere et originalt dynamisk område af det indledende audiosignal ved en komprimeringsfremgangsmåde, der omfatter at opdele det indledende audiosignal i et antal segmenter ved at benytte en defineret form af vinduet, at beregne en bredbåndsforstærkning i frekvensdomænet ved at benytte et ikke-energibaseret gennemsnit af frekvensdomæneprøver af det indledende audiosignal, og at anvende individuelle forstærkningsværdier til hvert segment af antallet af segmenter for at forstærke segmenterne af relativt lav intensitet og at dæmpe segmenter af relativt høj intensitet.
8. Fremgangsmåden ifølge krav 7, hvor segmenterne lapper over og hvor en første filterbank benyttes til at analysere audiosignalet for at opnå frekvensdomænerepræsentationen og den definerede form af vinduet, der svarer til et prototypefilter for den første filterbank.
9. Fremgangsmåden ifølge krav 8, hvor den første filterbank er en af en kvadraturmoduleret filter(QMF)bank eller en korttids-Fourier-transformation.
10. Fremgangsmåden ifølge krav 8, hvor hver enkelt forstærkning beregnes ved at benytte prøver af underbånd i en undergruppe af underbånd i et respektivt tidssegment.
11. Fremgangsmåden ifølge krav 10, hvor undergruppen af underbånd svarer til hele frekvensområdet, der er udspændt af den første filterbank, og hvor forstærkningen anvendes i domænet for den første filterbank.
12. Fremgangsmåden ifølge krav 10, hvor forstærkningen af hvert tidssegment er afledt af p-normen af prøver af underbånd i hvert tidssegment, hvor p er et positivt reelt tal ikke er lig med to.
13. Apparat til komprimering af et audiosignal, der omfatter: en første grænseflade til at modtagelse et indledende audiosignal; og en kompressor til at komprimere det indledende audiosignal for væsentligt at reducere et originalt dynamisk område af det indledende audiosignal ved at opdele det indledende audiosignal i et antal segmenter ved at benytte en defineret form af vinduet, at beregne en bredbåndsforstærkning i frekvensdomænet ved at benytte et ikke-energibaseret gennemsnit af frekvensdomæneprøver af det indledende audiosignal, og at anvende individuelle forstærkningsværdier til hvert segment af antallet af segmenter til at forstærke segmenter af relativ lav intensitet og dæmpe segmenter af relativ høj intensitet.
14. Apparat til at ekspandere et audiosignal, der omfatter: en første grænseflade til at modtage et komprimeret audiosignal; og en ekspander til at ekspandere det komprimerede audiosignal for væsentligt at genoprette det oprindelige ikke-komprimerede dynamiske område ved at opdele det komprimerede audiosignal i et antal segmenter ved at benytte en defineret form af vinduet, at beregne en bredbåndsforstærkning i frekvensdomænet ved at benytte et ikke-energibaseret gennemsnit af frekvensdomæneprøver af det komprimerede audiosignal, og at benytte individuelle forstærkningsværdier til hvert segment af antallet af segmenter til at forstærke segmenter med relativt høj intensitet og dæmpe segmenter af relativt lav intensitet.
15. Computer-læsbart, ikke-transitorisk, ikke-flygtigt lagringsmedium, der indeholder et computerprogram med instruktioner, som er indrettet til at udføre fremgangsmåden ifølge ethvert af kravene 1-6 eller 7-12.
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US201361809028P | 2013-04-05 | 2013-04-05 | |
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PCT/US2014/032578 WO2014165543A1 (en) | 2013-04-05 | 2014-04-01 | Companding apparatus and method to reduce quantization noise using advanced spectral extension |
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US (6) | US9947335B2 (da) |
EP (3) | EP2981963B1 (da) |
JP (7) | JP6026678B2 (da) |
KR (7) | KR102509345B1 (da) |
CN (8) | CN114566183A (da) |
AP (1) | AP2015008800A0 (da) |
AU (1) | AU2014248232B2 (da) |
BR (2) | BR112015019176B1 (da) |
CA (1) | CA2900724C (da) |
CL (1) | CL2015002278A1 (da) |
DK (1) | DK2981963T3 (da) |
EA (1) | EA028755B9 (da) |
ES (1) | ES2617314T3 (da) |
HK (4) | HK1254790A1 (da) |
HU (1) | HUE031966T2 (da) |
IL (8) | IL300496A (da) |
ME (1) | ME02623B (da) |
MX (1) | MX342965B (da) |
MY (2) | MY197063A (da) |
PL (1) | PL2981963T3 (da) |
RU (2) | RU2712814C2 (da) |
SG (1) | SG11201506134XA (da) |
WO (1) | WO2014165543A1 (da) |
ZA (1) | ZA201600393B (da) |
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WO2017080835A1 (en) | 2015-11-10 | 2017-05-18 | Dolby International Ab | Signal-dependent companding system and method to reduce quantization noise |
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MY191093A (en) * | 2016-02-17 | 2022-05-30 | Fraunhofer Ges Forschung | Post-processor, pre-processor, audio encoder, audio decoder and related methods for enhancing transient processing |
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RU2691122C1 (ru) * | 2018-06-13 | 2019-06-11 | Ордена трудового Красного Знамени федеральное государственное бюджетное образовательное учреждение высшего образования "Московский технический университет связи и информатики" (МТУСИ) | Способ и устройство компандирования звуковых вещательных сигналов |
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RU2731602C1 (ru) * | 2019-09-30 | 2020-09-04 | Ордена трудового Красного Знамени федеральное государственное бюджетное образовательное учреждение высшего образования "Московский технический университет связи и информатики" (МТУСИ) | Способ и устройство компандирования с предыскажением звуковых вещательных сигналов |
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