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公开(公告)号：US20240249739A1
公开(公告)日：2024-07-25
申请号：US18439616
申请日：2024-02-12
发明人： Lars VILLEMOES , Per HEDELIN
IPC分类号： G10L19/26 , G10L19/02 , G10L21/0388 , G10L25/90
CPC分类号： G10L19/265 , G10L19/02 , G10L21/0388 , G10L25/90
摘要： The present invention relates to audio coding systems which make use of a harmonic transposition method for high frequency reconstruction (HFR). A system and a method for generating a high frequency component of a signal from a low frequency component of the signal is described. The system comprises an analysis filter bank providing a plurality of analysis subband signals of the low frequency component of the signal. It also comprises a non-linear processing unit to generate a synthesis subband signal with a synthesis frequency by modifying the phase of a first and a second of the plurality of analysis subband signals and by combining the phase-modified analysis subband signals. Finally, it comprises a synthesis filter bank for generating the high frequency component of the signal from the synthesis subband signal.
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公开(公告)号：US11810592B2
公开(公告)日：2023-11-07
申请号：US18113406
申请日：2023-02-23
IPC分类号： G10L21/0388 , G10L19/008 , H04S3/00 , G10L19/02 , G10L19/24
CPC分类号： G10L21/0388 , G10L19/008 , G10L19/02 , H04S3/008
摘要： A method for decoding an encoded audio bitstream is disclosed. The method includes receiving the encoded audio bitstream and decoding the audio data to generate a decoded lowband audio signal. The method further includes extracting high frequency reconstruction metadata and filtering the decoded lowband audio signal with an analysis filterbank to generate a filtered lowband audio signal. The method also includes extracting a flag indicating whether either spectral translation or harmonic transposition is to be performed on the audio data and regenerating a highband portion of the audio signal using the filtered lowband audio signal and the high frequency reconstruction metadata in accordance with the flag. The high frequency regeneration is performed as a post-processing operation with a delay of 3010 samples per audio channel.
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63.发明公开公开(公告)号：US20230352032A1
公开(公告)日：2023-11-02
申请号：US18220677
申请日：2023-07-11
发明人： Sascha DISCH , Frederik NAGEL , Ralf GEIGER , Balaji Nagendran THOSHKAHNA , Konstantin SCHMIDT , Stefan BAYER , Christian NEUKAM , Bernd EDLER , Christian HELMRICH
IPC分类号： G10L19/008 , G10L25/18 , G10L25/21 , G10L21/0388 , G10L19/025 , G10L19/03 , G10L19/02 , G10L19/022 , G10L19/032 , G10L19/06 , G10L25/06 , H04S1/00
CPC分类号： G10L19/008 , G10L25/18 , G10L25/21 , G10L21/0388 , G10L19/025 , G10L19/03 , G10L19/0204 , G10L19/0212 , G10L19/022 , G10L19/032 , G10L19/06 , G10L19/0208 , G10L25/06 , H04S1/007 , G10L19/02
摘要： An apparatus for generating a decoded two-channel signal, comprising: a parametric decoder for providing parametric data for a second set of second spectral portions and a two-channel identification identifying for a second spectral portion of the second set of second spectral portions either a first two-channel representation for the second spectral portion of the second set of second spectral portions or a second two-channel representation for the second spectral portion of the second set of second spectral portions, the second two-channel representation being different from the first two-channel representation; and a frequency regenerator for regenerating the second spectral portion of the second set of second spectral portions depending on a first spectral portion of a first set of first spectral portions, the parametric data for the second spectral portion of the second set of second spectral portions and the two-channel identification for the second spectral portion of the second set of second spectral portions to acquire a regenerated second spectral portion of the second set of second spectral portions.
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公开(公告)号：US20230343359A1
公开(公告)日：2023-10-26
申请号：US17729238
申请日：2022-04-26
IPC分类号： G10L21/0388 , G10L15/20 , G10L21/0364
CPC分类号： G10L21/0388 , G10L15/20 , G10L21/0364
摘要： A method of detecting a suitability of a signal for live speech detection, the method comprising: receiving the signal containing speech from a transducer; measuring a signal characteristic of an audible component of the received signal; estimating an expected signal characteristic of an ultrasonic component of the received signal based on the measured signal characteristic of the audible component; determining, based on the estimated expected signal characteristic, whether the ultrasonic component is suitable for detecting whether the speech is live speech.
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公开(公告)号：US20230298606A1
公开(公告)日：2023-09-21
申请号：US18311542
申请日：2023-05-03
发明人： Lars VILLEMOES , Per HEDELIN
IPC分类号： G10L19/26 , G10L19/02 , G10L21/0388
CPC分类号： G10L19/265 , G10L19/02 , G10L21/0388 , G10L25/90
摘要： The present invention relates to audio coding systems which make use of a harmonic transposition method for high frequency reconstruction (HFR). A system and a method for generating a high frequency component of a signal from a low frequency component of the signal is described. The system comprises an analysis filter bank providing a plurality of analysis subband signals of the low frequency component of the signal. It also comprises a non-linear processing unit to generate a synthesis subband signal with a synthesis frequency by modifying the phase of a first and a second of the plurality of analysis subband signals and by combining the phase-modified analysis subband signals. Finally, it comprises a synthesis filter bank for generating the high frequency component of the signal from the synthesis subband signal.
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公开(公告)号：US11721355B2
公开(公告)日：2023-08-08
申请号：US17677850
申请日：2022-02-22
申请人： Apple Inc.
发明人： Christopher T. Eubank , Lance Jabr , Matthew S. Connolly , Robert D. Silfvast , Sean A. Ramprashad , Carlos Avendano , Miquel Espi Marques
IPC分类号： G10L21/0388 , G10L21/0208 , G10L19/008 , G10L21/0272
CPC分类号： G10L21/0388 , G10L19/008 , G10L21/0208 , G10L21/0272
摘要： A first device obtains, from the array, several audio signals and processes the audio signals to produce a speech signal and one or more ambient signals. The first device processes the ambient signals to produce a sound-object sonic descriptor that has metadata describing a sound object within an acoustic environment. The first device transmits, over a communication data link, the speech signal and the descriptor to a second electronic device that is configured to spatially reproduce the sound object using the descriptor mixed with the speech signal, to produce several mixed signals to drive several speakers.
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公开(公告)号：US11715484B2
公开(公告)日：2023-08-01
申请号：US17856221
申请日：2022-07-01
IPC分类号： G10L21/038 , G10L21/0388 , G10L19/032
CPC分类号： G10L21/0388 , G10L19/032
摘要： A decoding apparatus includes: a bandwidth extending part 25 obtaining a decoded extended frequency spectrum sequence by arranging samples based on K samples included in a frequency-domain sample sequence obtained by decoding, on a higher side than the frequency-domain sample sequence; and a fricative sound adjustment releasing part 23 obtaining, if inputted information indicating whether a hissing sound or not indicates being a hissing sound, what is obtained by exchanging all or a part of a low-side frequency sample sequence existing on a lower side than a predetermined frequency in the decoded extended frequency spectrum sequence for all or a part of a high-side frequency sample sequence existing on a higher side than the predetermined frequency in the decoded extended frequency spectrum sequence as an adjusted frequency spectrum sequence, the number of all or the part of the high-side frequency spectrum sequence being the same as the number of all or the part of the low-side frequency spectrum sequence.
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公开(公告)号：US20230197102A1
公开(公告)日：2023-06-22
申请号：US18113397
申请日：2023-02-23
IPC分类号： G10L21/0388 , G10L19/008 , G10L19/02 , H04S3/00
CPC分类号： G10L21/0388 , G10L19/008 , G10L19/02 , H04S3/008
摘要： A method for decoding an encoded audio bitstream is disclosed. The method includes receiving the encoded audio bitstream and decoding the audio data to generate a decoded lowband audio signal. The method further includes extracting high frequency reconstruction metadata and filtering the decoded lowband audio signal with an analysis filterbank to generate a filtered lowband audio signal. The method also includes extracting a flag indicating whether either spectral translation or harmonic transposition is to be performed on the audio data and regenerating a highband portion of the audio signal using the filtered lowband audio signal and the high frequency reconstruction metadata in accordance with the flag. The high frequency regeneration is performed as a post-processing operation with a delay of 3010 samples per audio channel.
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公开(公告)号：US20230197101A1
公开(公告)日：2023-06-22
申请号：US18113391
申请日：2023-02-23
IPC分类号： G10L21/0388 , G10L19/008 , G10L19/02 , H04S3/00
CPC分类号： G10L21/0388 , G10L19/008 , G10L19/02 , H04S3/008
摘要： A method for decoding an encoded audio bitstream is disclosed. The method includes receiving the encoded audio bitstream and decoding the audio data to generate a decoded lowband audio signal. The method further includes extracting high frequency reconstruction metadata and filtering the decoded lowband audio signal with an analysis filterbank to generate a filtered lowband audio signal. The method also includes extracting a flag indicating whether either spectral translation or harmonic transposition is to be performed on the audio data and regenerating a highband portion of the audio signal using the filtered lowband audio signal and the high frequency reconstruction metadata in accordance with the flag. The high frequency regeneration is performed as a post-processing operation with a delay of 3010 samples per audio channel.
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公开(公告)号：US11682410B2
公开(公告)日：2023-06-20
申请号：US17338431
申请日：2021-06-03
发明人： Lars Villemoes , Per Hedelin
IPC分类号： G10L19/26 , G10L19/02 , G10L21/0388 , G10L25/90
CPC分类号： G10L19/265 , G10L19/02 , G10L21/0388 , G10L25/90
摘要： The present invention relates to audio coding systems which make use of a harmonic transposition method for high frequency reconstruction (HFR). A system and a method for generating a high frequency component of a signal from a low frequency component of the signal is described. The system comprises an analysis filter bank providing a plurality of analysis subband signals of the low frequency component of the signal. It also comprises a non-linear processing unit to generate a synthesis subband signal with a synthesis frequency by modifying the phase of a first and a second of the plurality of analysis subband signals and by combining the phase-modified analysis subband signals. Finally, it comprises a synthesis filter bank for generating the high frequency component of the signal from the synthesis subband signal.
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