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1. 发明申请

US20230059049A1 BACKWARD-COMPATIBLE INTEGRATION OF HIGH FREQUENCY RECONSTRUCTION TECHNIQUES FOR AUDIO SIGNALS 有权
公开(公告)号：US20230059049A1
公开(公告)日：2023-02-23
申请号：US17973397
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. 发明申请

US20230050996A1 BACKWARD-COMPATIBLE INTEGRATION OF HIGH FREQUENCY RECONSTRUCTION TECHNIQUES FOR AUDIO SIGNALS 有权
公开(公告)号：US20230050996A1
公开(公告)日：2023-02-16
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.

3. 发明申请

US20210366500A1 Cross Product Enhanced Harmonic Transposition 有权
公开(公告)号：US20210366500A1
公开(公告)日：2021-11-25
申请号：US17338431
申请日：2021-06-03
申请人： Dolby International AB
发明人： Lars VILLEMOES , Per HEDELIN
IPC分类号： G10L19/26 , G10L19/02 , G10L21/0388
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.

4. 发明申请

US20210195357A1 BINAURAL MULTI-CHANNEL DECODER IN THE CONTEXT OF NON-ENERGY-CONSERVING UPMIX RULES 有权
公开(公告)号：US20210195357A1
公开(公告)日：2021-06-24
申请号：US17110903
申请日：2020-12-03
申请人： DOLBY INTERNATIONAL AB
发明人： Lars VILLEMOES
IPC分类号： H04S7/00 , G10L19/008
摘要： A multi-channel decoder for generating a binaural signal from a downmix signal using upmix rule information on an energy-error introducing upmix rule for calculating a gain factor based on the upmix rule information and characteristics of head related transfer function based filters corresponding to upmix channels. The one or more gain factors are used by a filter processor for filtering the downmix signal so that an energy corrected binaural signal having a left binaural channel and a right binaural channel is obtained.

5. 发明申请

US20200349911A1 Efficient Combined Harmonic Transposition 审中-公开
公开(公告)号：US20200349911A1
公开(公告)日：2020-11-05
申请号：US16876793
申请日：2020-05-18
申请人： Dolby International AB
发明人： Per EKSTRAND , Lars VILLEMOES , Per HEDELIN
IPC分类号： G10H1/00 , G10L21/038 , G10L19/26 , G10H1/12
摘要： The present document relates to audio coding systems which make use of a harmonic transposition method for high frequency reconstruction (HFR), and to digital effect processors, e.g. so-called exciters, where generation of harmonic distortion adds brightness to the processed signal. In particular, a system configured to generate a high frequency component of a signal from a low frequency component of the signal is described. The system may comprise an analysis filter bank (501) configured to provide a set of analysis subband signals from the low frequency component of the signal; wherein the set of analysis subband signals comprises at least two analysis subband signals; wherein the analysis filter bank (501) has a frequency resolution of Δf. The system further comprises a nonlinear processing unit (502) configured to determine a set of synthesis subband signals from the set of analysis subband signals using a transposition order P; wherein the set of synthesis subband signals comprises a portion of the set of analysis subband signals phase shifted by an amount derived from the transposition order P; and a synthesis filter bank (504) configured to generate the high frequency component of the signal from the set of synthesis subband signals; wherein the synthesis filter bank (504) has a frequency resolution of FΔf; with F being a resolution factor, with F≥1; wherein the transposition order P is different from the resolution factor F.

6. 发明申请

US20200273476A1 Cross Product Enhanced Harmonic Transposition 审中-公开
公开(公告)号：US20200273476A1
公开(公告)日：2020-08-27
申请号：US16810756
申请日：2020-03-05
申请人： Dolby International AB
发明人： Lars VILLEMOES , Per HEDELIN
IPC分类号： G10L19/26 , G10L19/02 , G10L21/0388
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.

7. 发明申请

US20190295557A1 DECODING OF AUDIO SCENES 审中-公开
公开(公告)号：US20190295557A1
公开(公告)日：2019-09-26
申请号：US16439661
申请日：2019-06-12
申请人： DOLBY INTERNATIONAL AB
发明人： Heiko PURNHAGEN , Lars VILLEMOES , Leif Jonas SAMUELSSON , Toni HIRVONEN
IPC分类号： G10L19/008 , G10L19/20 , H04S5/00 , H04S3/02
摘要： Exemplary embodiments provide encoding and decoding methods, and associated encoders and decoders, for encoding and decoding of an audio scene which is represented by one or more audio signals. The encoder generates a bit stream which comprises downmix signals and side information which includes individual matrix elements of a reconstruction matrix which enables reconstruction of the one or more audio signals in the decoder.

8. 发明申请

US20190259401A1 Model Based Prediction in a Critically Sampled Filterbank 审中-公开
公开(公告)号：US20190259401A1
公开(公告)日：2019-08-22
申请号：US16403028
申请日：2019-05-03
申请人： DOLBY INTERNATIONAL AB
发明人： Lars VILLEMOES
IPC分类号： G10L19/02 , G10L19/032 , G10L19/06 , G10L19/26 , G10L19/093 , G06F17/50 , G10L19/005
摘要： The present document relates to audio source coding systems. In particular, the present document relates to audio source coding systems which make use of linear prediction in combination with a filterbank. A method for estimating a first sample (615) of a first subband signal in a first subband of an audio signal is described. The first subband signal of the audio signal is determined using an analysis filterbank (612) comprising a plurality of analysis filters which provide a plurality of subband signals in a plurality of subbands from the audio signal, respectively. The method comprises determining a model parameter (613) of a signal model; determining a prediction coefficient to be applied to a previous sample (614) of a first decoded subband signals derived from the first subband signal, based on the signal model, based on the model parameter (613) and based on the analysis filterbank (612); wherein a time slot of the previous sample (614) is prior to a time slot of the first sample (615); and determining an estimate of the first sample (615) by applying the prediction coefficient to the previous sample (614).

9. 发明申请

US20190251976A1 DECODING OF AUDIO SCENES 审中-公开
公开(公告)号：US20190251976A1
公开(公告)日：2019-08-15
申请号：US16367570
申请日：2019-03-28
申请人： DOLBY INTERNATIONAL AB
发明人： Heiko PURNHAGEN , Lars VILLEMOES , Leif Jonas SAMUELSSON , Toni HIRVONEN
IPC分类号： G10L19/008 , H04S3/02 , G10L19/20 , H04S5/00
摘要： Exemplary embodiments provide encoding and decoding methods, and associated encoders and decoders, for encoding and decoding of an audio scene which is represented by one or more audio signals. The encoder generates a bit stream which comprises downmix signals and side information which includes individual matrix elements of a reconstruction matrix which enables reconstruction of the one or more audio signals in the decoder.

10. 发明申请

US20190081719A1 Packet Loss Concealment for Critically-Sampled Filter Bank-Based Codecs Using Multi-Sinusoidal Detection 审中-公开
公开(公告)号：US20190081719A1
公开(公告)日：2019-03-14
申请号：US16126940
申请日：2018-09-10
申请人： Dolby Laboratories Licensing Corporation , Dolby International AB
发明人： Shen HUANG , Lars VILLEMOES
IPC分类号： H04J3/06 , G10L19/005 , H04L29/06 , H04L12/835 , G10L19/04
摘要： Systems and methods are described for concealing packet loss in a received audio stream. Candidate frequency lines may be identified within one or two previous frames of the audio stream. For two-frame concealment, gains may be calculated for each candidate frequency line between a first frame and a second frame, and candidate frequency lines may be selected based on the calculated gains. Different techniques may be used to select the candidate frequency lines, including a full-search method and a hybrid method based on selecting peaks from a pseudospectrum. Sub-band predictors may be selected from a database of predictor candidates based on the selected candidate frequency lines. Each predictor may be a function of frequency, and the selected predictors may be arranged as a matrix. The sub-band predictors may then be applied to corresponding blocks of the second frame to obtain sub-band coefficients used to reconstruct the lost frame.

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