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1. 发明授权

US11626121B2 Backward-compatible integration of high frequency reconstruction techniques for audio signals 有权
公开(公告)号：US11626121B2
公开(公告)日：2023-04-11
申请号：US17973393
申请日：2022-10-25
申请人： DOLBY INTERNATIONAL AB
发明人： Kristofer Kjoerling , Lars Villemoes , Heiko Purnhagen , Per Ekstrand
IPC分类号： G10L19/02 , G10L19/16 , G10L19/26 , H03M7/30
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.

2. 发明授权

US11568880B2 Processing of audio signals during high frequency reconstruction 有权
公开(公告)号：US11568880B2
公开(公告)日：2023-01-31
申请号：US17338667
申请日：2021-06-04
申请人： Dolby International AB
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.

3. 发明授权

US11423916B2 Method for reduction of aliasing introduced by spectral envelope adjustment in real-valued filterbanks 有权
公开(公告)号：US11423916B2
公开(公告)日：2022-08-23
申请号：US16900950
申请日：2020-06-14
申请人： DOLBY INTERNATIONAL AB
发明人： Kristofer Kjoerling , Lars Villemoes
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.

4. 发明授权

US11238876B2 Methods for improving high frequency reconstruction 有权
公开(公告)号：US11238876B2
公开(公告)日：2022-02-01
申请号：US16556016
申请日：2019-08-29
申请人： Dolby International AB
发明人： Kristofer Kjoerling , Per Ekstrand , Holger Hoerich
IPC分类号： G10L19/02 , G10L21/038 , G10L19/07 , G10L19/24 , G10L19/00 , G10L19/028 , G10L19/06 , G10L19/093 , G10L19/26 , G10L19/16
摘要： The present invention proposes a new method and a new apparatus for enhancement of audio source coding systems utilising high frequency reconstruction (HFR). It utilises a detection mechanism on the encoder side to assess what parts of the spectrum will not be correctly reproduced by the HFR method in the decoder. Information on this is efficiently coded and sent to the decoder, where it is combined with the output of the HFR input.

5. 发明申请

US20210366494A1 PROCESSING OF AUDIO SIGNALS DURING HIGH FREQUENCY RECONSTRUCTION 有权
公开(公告)号：US20210366494A1
公开(公告)日：2021-11-25
申请号：US17338667
申请日：2021-06-04
申请人： Dolby International AB
发明人： Kristofer Kjoerling
IPC分类号： G10L19/00 , G10L19/02 , 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.

6. 发明申请

US20210318848A1 DYNAMIC RANGE CONTROL FOR A WIDE VARIETY OF PLAYBACK ENVIRONMENTS 有权
公开(公告)号：US20210318848A1
公开(公告)日：2021-10-14
申请号：US17209046
申请日：2021-03-22
申请人： DOLBY LABORATORIES LICENSING CORPORATION , DOLBY INTERNATIONAL AB
发明人： Jeroen Koppens , Jeffrey Riedmiller , Kristofer Kjoerling , Alexander Stahlmann , Holger Hoerich , Alan J. Seefeldt
IPC分类号： G06F3/16 , H03G7/00 , H03G9/00 , G10L19/16 , H03G9/02 , H03G9/18 , H03G3/30 , H03G9/12 , H04S1/00 , H04S7/00 , G10L21/0324
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.

7. 发明授权

US10950252B2 System for maintaining reversible dynamic range control information associated with parametric audio coders 有权
公开(公告)号：US10950252B2
公开(公告)日：2021-03-16
申请号：US16720497
申请日：2019-12-19
申请人： DOLBY LABORATORIES LICENSING CORPORATION , DOLBY INTERNATIONAL AB
发明人： Jeffrey Riedmiller , Karl J. Roeden , Kristofer Kjoerling , Heiko Purnhagen , Vinay Melkote , Leif Sehlstrom
IPC分类号： G10L19/24 , G10L19/18 , G10L19/008 , G10L19/16
摘要： On the basis of a bitstream (P), an n-channel audio signal (X) is reconstructed by deriving an m-channel core signal (Y) and multichannel coding parameters (a) from the bitstream, where 1≤m

8. 发明授权

US10593340B2 Methods and apparatus for decoding encoded audio signal(s) 有权
公开(公告)号：US10593340B2
公开(公告)日：2020-03-17
申请号：US16408318
申请日：2019-05-09
申请人： DOLBY INTERNATIONAL AB
发明人： Heiko Purnhagen , Harald Mundt , Kristofer Kjoerling
IPC分类号： G10L19/008 , G10L19/02 , G10L19/24 , H04S5/00
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.

9. 发明申请

US20190385624A1 Methods for improving high frequency reconstruction 审中-公开
公开(公告)号：US20190385624A1
公开(公告)日：2019-12-19
申请号：US16556016
申请日：2019-08-29
申请人： Dolby International AB
发明人： Kristofer Kjoerling , Per Ekstrand , Holger Hoerich
IPC分类号： G10L19/02 , G10L19/00 , G10L19/028 , G10L19/06 , G10L21/038 , G10L19/093 , G10L19/16 , G10L19/24 , G10L19/26 , G10L19/07
摘要： The present invention proposes a new method and a new apparatus for enhancement of audio source coding systems utilising high frequency reconstruction (HFR). It utilises a detection mechanism on the encoder side to assess what parts of the spectrum will not be correctly reproduced by the HFR method in the decoder. Information on this is efficiently coded and sent to the decoder, where it is combined with the output of the HFR input.

10. 发明授权

US10510355B2 Time-alignment of QMF based processing data 有权
公开(公告)号：US10510355B2
公开(公告)日：2019-12-17
申请号：US15021820
申请日：2014-09-08
申请人： DOLBY INTERNATIONAL AB
发明人： Kristofer Kjoerling , Heiko Purnhagen , Jens Popp
IPC分类号： G10L19/16 , G10L19/02 , G10L19/032 , G10L19/018 , G10L21/0388
摘要： The present document relates to time-alignment of encoded data of an audio encoder with associated metadata, such as spectral band replication (SBR) metadata. An audio decoder (100, 300) configured to determine a reconstructed frame of an audio signal (237) from an access unit (110) of a received data stream is described. The access unit (110) comprises waveform data (111) and metadata (112), wherein the waveform data (111) and the metadata (112) are associated with the same reconstructed frame of the audio signal (127). The audio decoder (100, 300) comprises a waveform processing path (101, 102, 103, 104, 105) configured to generate a plurality of waveform subband signals (123) from the waveform data (111), and a metadata processing path (108, 109) configured to generate decoded metadata (128) from the metadata (111).

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