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公开(公告)号：US20240282315A1
公开(公告)日：2024-08-22
申请号：US18653833
申请日：2024-05-02
发明人： Kristofer Kjoerling
IPC分类号： G10L19/00 , G10L19/02 , G10L21/038
CPC分类号： G10L19/0017 , G10L19/0204 , G10L21/038
摘要： The application relates to HFR (High Frequency Reconstruction/Regeneration) of audio signals. In particular, the application relates to a method and system for performing HFR of audio signals having large variations in energy level across the low frequency range which is used to reconstruct the high frequencies of the audio signal. A system configured to generate a plurality of high frequency subband signals covering a high frequency interval from a plurality of low frequency subband signals is described. The system comprises means for receiving the plurality of low frequency subband signals; means for receiving a set of target energies, each target energy covering a different target interval within the high frequency interval and being indicative of the desired energy of one or more high frequency subband signals lying within the target interval; means for generating the plurality of high frequency subband signals from the plurality of low frequency subband signals and from a plurality of spectral gain coefficients associated with the plurality of low frequency subband signals, respectively; and means for adjusting the energy of the plurality of high frequency subband signals using the set of target energies.
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公开(公告)号：US12002476B2
公开(公告)日：2024-06-04
申请号：US18145797
申请日：2022-12-22
发明人： Kristofer Kjoerling
IPC分类号： G10L21/038 , G10L19/00 , G10L19/02
CPC分类号： G10L19/0017 , G10L19/0204 , G10L21/038
摘要： The application relates to HFR (High Frequency Reconstruction/Regeneration) of audio signals. In particular, the application relates to a method and system for performing HFR of audio signals having large variations in energy level across the low frequency range which is used to reconstruct the high frequencies of the audio signal. A system configured to generate a plurality of high frequency subband signals covering a high frequency interval from a plurality of low frequency subband signals is described. The system comprises means for receiving the plurality of low frequency subband signals; means for receiving a set of target energies, each target energy covering a different target interval within the high frequency interval and being indicative of the desired energy of one or more high frequency subband signals lying within the target interval; means for generating the plurality of high frequency subband signals from the plurality of low frequency subband signals and from a plurality of spectral gain coefficients associated with the plurality of low frequency subband signals, respectively; and means for adjusting the energy of the plurality of high frequency subband signals using the set of target energies.
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3.发明授权公开(公告)号：US11961528B2
公开(公告)日：2024-04-16
申请号：US18357679
申请日：2023-07-24
CPC分类号： G10L19/02 , G10L19/167 , G10L19/26 , H03M7/6005 , H03M7/6011
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.
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4.发明授权公开(公告)号：US11908486B2
公开(公告)日：2024-02-20
申请号：US18157644
申请日：2023-01-20
IPC分类号： G10L19/18 , G10L21/038
CPC分类号： G10L19/18 , G10L21/038
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：US11862185B2
公开(公告)日：2024-01-02
申请号：US18113418
申请日：2023-02-23
IPC分类号： G10L21/0388 , G10L19/008 , H04S3/00 , G10L19/02
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：US11842122B2
公开(公告)日：2023-12-12
申请号：US17898358
申请日：2022-08-29
发明人： Jeroen Koppens , Jeffrey Riedmiller , Kristofer Kjoerling , Alexander Stahlmann , Holger Hoerich , Alan J. Seefeldt
IPC分类号： G06F3/16 , G10L19/16 , H03G7/00 , H03G9/00 , H03G9/02 , H04S7/00 , H03G9/18 , H03G3/30 , H03G9/12 , H04S1/00 , G10L21/0324
CPC分类号： G06F3/165 , G10L19/167 , G10L21/0324 , H03G3/3005 , H03G3/3089 , H03G7/002 , H03G7/007 , H03G9/005 , H03G9/025 , H03G9/12 , H03G9/18 , H04S1/00 , H04S7/30 , H04S2400/13
摘要： In an audio encoder, for audio content received in a source audio format, default gains are generated based on a default dynamic range compression (DRC) curve, and non-default gains are generated for a non-default gain profile. Based on the default gains and non-default gains, differential gains are generated. An audio signal comprising the audio content, the default DRC curve, and differential gains is generated. In an audio decoder, the default DRC curve and the differential gains are identified from the audio signal. Default gains are re-generated based on the default DRC curve. Based on the combination of the re-generated default gains and the differential gains, operations are performed on the audio content extracted from the audio signal.
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公开(公告)号：US11776552B2
公开(公告)日：2023-10-03
申请号：US17817399
申请日：2022-08-04
IPC分类号： G10L19/008 , G10L19/02 , G10L19/24 , H04S5/00
CPC分类号： G10L19/008 , G10L19/02 , G10L19/24 , H04S5/00 , H04S2400/03 , H04S2420/03
摘要： There are provided decoding and encoding methods for encoding and decoding of multichannel audio content for playback on a speaker configuration with N channels. The decoding method comprises decoding, in a first decoding module, M input audio signals into M mid signals which are suitable for playback on a speaker configuration with M channels; and for each of the N channels in excess of M channels, receiving an additional input audio signal corresponding to one of the M mid signals and decoding the input audio signal and its corresponding mid signal so as to generate a stereo signal including a first and a second audio signal which are suitable for playback on two of the N channels of the speaker configuration.
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8.发明授权公开(公告)号：US11626121B2
公开(公告)日：2023-04-11
申请号：US17973393
申请日：2022-10-25
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.
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公开(公告)号：US11568880B2
公开(公告)日：2023-01-31
申请号：US17338667
申请日：2021-06-04
发明人： Kristofer Kjoerling
IPC分类号： G10L21/038 , G10L19/00 , G10L19/02
摘要： The application relates to HFR (High Frequency Reconstruction/Regeneration) of audio signals. In particular, the application relates to a method and system for performing HFR of audio signals having large variations in energy level across the low frequency range which is used to reconstruct the high frequencies of the audio signal. A system configured to generate a plurality of high frequency subband signals covering a high frequency interval from a plurality of low frequency subband signals is described. The system comprises means for receiving the plurality of low frequency subband signals; means for receiving a set of target energies, each target energy covering a different target interval within the high frequency interval and being indicative of the desired energy of one or more high frequency subband signals lying within the target interval; means for generating the plurality of high frequency subband signals from the plurality of low frequency subband signals and from a plurality of spectral gain coefficients associated with the plurality of low frequency subband signals, respectively; and means for adjusting the energy of the plurality of high frequency subband signals using the set of target energies.
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10.发明授权公开(公告)号：US11423916B2
公开(公告)日：2022-08-23
申请号：US16900950
申请日：2020-06-14
IPC分类号： G10L19/02 , G10L25/18 , G10L25/48 , H03H17/02 , G10L19/00 , G10L19/12 , G10L19/26 , G10L25/21 , G10L19/025 , G10L19/083 , G10L25/12
摘要： The present invention proposes a new method for improving the performance of a real-valued filterbank based spectral envelope adjuster. By adaptively locking the gain values for adjacent channels dependent on the sign of the channels, as defined in the application, reduced aliasing is achieved. Furthermore, the grouping of the channels during gain-calculation, gives an improved energy estimate of the real valued subband signals in the filterbank.
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