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51. 发明公开

EP3321932A1 NON-UNIFORM PARAMETER QUANTIZATION FOR ADVANCED COUPLING 有权转让
公开(公告)号：EP3321932A1
公开(公告)日：2018-05-16
申请号：EP17185212.2
申请日：2014-09-08
申请人： Dolby International AB
发明人： PURNHAGEN, Heiko , EKSTRAND, Per
IPC分类号： G10L19/035 , G10L19/008
摘要： The present disclosure provides methods, devices and computer program products for non-uniform quantization of parameters relating to parametric spatial coding of audio signals. The disclosure further relates to a method and apparatus for reconstructing an audio object in an audio decoding system taking the non-uniformly quantized parameters into account. According to the disclosure, such an approach renders it possible to reduce bit consumption without substantially reducing the quality of the reconstructed audio object.

52. 发明公开

EP3268961A1 DECODING AUDIO BITSTREAMS WITH ENHANCED SPECTRAL BAND REPLICATION METADATA IN AT LEAST ONE FILL ELEMENT 有权转让
标题翻译：在至少一个填充元素中使用增强的谱带复制元数据解码音频比特流
公开(公告)号：EP3268961A1
公开(公告)日：2018-01-17
申请号：EP16709426.7
申请日：2016-03-10
申请人： Dolby International AB
发明人： VILLEMOES, Lars , PURNHAGEN, Heiko , EKSTRAND, Per
IPC分类号： G10L19/16 , G10L19/24 , G10L21/038 , G10L19/035
摘要： Embodiments relate to an audio processing unit that includes a buffer, bitstream payload deformatter, and a decoding subsystem. The buffer stores at least one block of an encoded audio bitstream. The block includes a fill element that begins with an identifier followed by fill data. The fill data includes at least one flag identifying whether enhanced spectral band replication (eSBR) processing is to be performed on audio content of the block. A corresponding method for decoding an encoded audio bitstream is also provided.

53. 发明公开

EP3268956A1 DECODING AUDIO BITSTREAMS WITH ENHANCED SPECTRAL BAND REPLICATION METADATA IN AT LEAST ONE FILL ELEMENT 有权转让
公开(公告)号：EP3268956A1
公开(公告)日：2018-01-17
申请号：EP16765449.0
申请日：2016-03-10
申请人： Dolby International AB
发明人： VILLEMOES, Lars , PURNHAGEN, Heiko , EKSTRAND, Per
IPC分类号： G10L19/00
CPC分类号： G10L19/167 , G10L19/035 , G10L19/24 , G10L21/038
摘要： Embodiments relate to an audio processing unit that includes a buffer, bitstream payload deformatter, and a decoding subsystem. The buffer stores at least one block of an encoded audio bitstream. The block includes a fill element that begins with an identifier followed by fill data. The fill data includes at least one flag identifying whether enhanced spectral band replication (eSBR) processing is to be performed on audio content of the block. A corresponding method for decoding an encoded audio bitstream is also provided.

54. 发明授权

EP2907324B1 SYSTEM AND METHOD FOR REDUCING LATENCY IN TRANSPOSER-BASED VIRTUAL BASS SYSTEMS 有权转让
标题翻译：系统和方法以减少延迟时间差转台型虚拟BASS系统
公开(公告)号：EP2907324B1
公开(公告)日：2016-11-09
申请号：EP13771123.0
申请日：2013-09-27
申请人： Dolby International AB
发明人： EKSTRAND, Per
IPC分类号： H04R3/04 , G10L21/038
CPC分类号： H04R3/04 , G10L21/038 , H04R2430/03

55. 发明公开

EP2975766A3 LOW DELAY MODULATED FILTER BANK 有权转让
公开(公告)号：EP2975766A3
公开(公告)日：2016-05-11
申请号：EP15179546.5
申请日：2010-02-17
申请人： Dolby International AB
发明人： EKSTRAND, Per
IPC分类号： H03H17/02
CPC分类号： H04R3/04 , G06F17/10 , G06F17/11 , G10L19/008 , G10L19/0204 , G10L19/0208 , G10L19/26 , G10L19/265 , G10L21/00 , H03H17/0201 , H03H17/0248 , H03H17/0266 , H03H17/0275 , H03H17/0294 , H03H2017/0297 , H04S7/307
摘要： The document relates to modulated sub-sampled digital filter banks, as well as to methods and systems for the design of such filter banks. In particular, the present document proposes a method and apparatus for the improvement of low delay modulated digital filter banks. The method employs modulation of an asymmetric low-pass prototype filter. Further, a specific design for a 64 channel filter bank using a prototype filter length of 640 coefficients and a system delay of 319 samples is given. The method substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filter bank as a spectral equalizer. The method is preferably implemented in software, running on a standard PC or a digital signal processor (DSP), but can also be hardcoded on a custom chip. The method offers improvements for various types of digital equalizers, adaptive filters, multiband companders and spectral envelope adjusting filter banks used in high frequency reconstruction (HFR) or parametric stereo systems.

56. 发明授权

EP2545553B1 APPARATUS AND METHOD FOR PROCESSING AN AUDIO SIGNAL USING PATCH BORDER ALIGNMENT 有权转让
标题翻译：设备和方法处理的音频信号片边界取向
公开(公告)号：EP2545553B1
公开(公告)日：2014-07-30
申请号：EP11715452.6
申请日：2011-03-04
申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. , Dolby International AB , Disch, Sascha
发明人： VILLEMOES, Lars , EKSTRAND, Per , DISCH, Sascha , NAGEL, Frederik , WILDE, Stephan
IPC分类号： G10L21/038 , G10L21/04 , G10L19/02
CPC分类号： G10L19/008 , G10L19/0204 , G10L21/038 , G10L21/04
摘要： An apparatus for processing an input audio signal relies on a cascade of filterbanks, the cascade having a synthesis filterbank for synthesizing an audio intermediate signal from the input audio signal, the input audio signal being represented by a plurality of first subband signals generated by an analysis filterbank, wherein a number of filterbank channels of the synthesis filterbank is smaller than a number of channels of the analysis filterbank. The apparatus furthermore has a further analysis filterbank for generating a plurality of second subband signals from the audio intermediate signal, wherein the further analysis filterbank has a number of channels being different from the number of channels of the synthesis filterbank, so that a sampling rate of a subband signal of the plurality of second subband signals is different from a sampling rate of a first subband signal of the plurality of first subband signals.

57. 发明公开

EP2545553A1 APPARATUS AND METHOD FOR PROCESSING AN AUDIO SIGNAL USING PATCH BORDER ALIGNMENT 有权转让
标题翻译：设备和方法处理的音频信号片边界取向
公开(公告)号：EP2545553A1
公开(公告)日：2013-01-16
申请号：EP11715452.6
申请日：2011-03-04
申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. , Dolby International AB , Disch, Sascha
发明人： VILLEMOES, Lars , EKSTRAND, Per , DISCH, Sascha , NAGEL, Frederik , WILDE, Stephan
IPC分类号： G10L21/02 , G10L21/04 , G10L19/02
CPC分类号： G10L19/008 , G10L19/0204 , G10L21/038 , G10L21/04
摘要： An apparatus for processing an input audio signal relies on a cascade of filterbanks, the cascade having a synthesis filterbank for synthesizing an audio intermediate signal from the input audio signal, the input audio signal being represented by a plurality of first subband signals generated by an analysis filterbank, wherein a number of filterbank channels of the synthesis filterbank is smaller than a number of channels of the analysis filterbank. The apparatus furthermore has a further analysis filterbank for generating a plurality of second subband signals from the audio intermediate signal, wherein the further analysis filterbank has a number of channels being different from the number of channels of the synthesis filterbank, so that a sampling rate of a subband signal of the plurality of second subband signals is different from a sampling rate of a first subband signal of the plurality of first subband signals.

58. 发明公开

EP2436005A1 EFFICIENT COMBINED HARMONIC TRANSPOSITION 有权转让
标题翻译：高效复合谐波变换
公开(公告)号：EP2436005A1
公开(公告)日：2012-04-04
申请号：EP10721796.0
申请日：2010-05-25
申请人： Dolby International AB
发明人： EKSTRAND, Per , VILLEMOES, Lars , HEDELIN, Per
IPC分类号： G10L21/02 , G10L21/04
CPC分类号： G10H1/0091 , G10H1/125 , G10H2210/311 , G10L19/265 , G10L21/038 , G10L21/0388
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 ” f . 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 F ” f ; with F being a resolution factor, with F ‰¥ 1; wherein the transposition order P is different from the resolution factor F .

59. 发明公开

EP4404195A3 EFFICIENT COMBINED HARMONIC TRANSPOSITION 审中-公开
公开(公告)号：EP4404195A3
公开(公告)日：2024-08-14
申请号：EP24180306.3
申请日：2010-05-25
申请人： Dolby International AB
发明人： EKSTRAND, Per , VILLEMOES, Lars , HEDELIN, Per
IPC分类号： G10L21/038 , G10L21/0388
CPC分类号： G10L21/038 , G10L21/0388
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 Pis different from the resolution factorF.

60. 发明公开

EP4303871A3 BACKWARD-COMPATIBLE INTEGRATION OF HIGH FREQUENCY RECONSTRUCTION TECHNIQUES FOR AUDIO SIGNALS 审中-实审
公开(公告)号：EP4303871A3
公开(公告)日：2024-03-20
申请号：EP23210525.4
申请日：2019-01-28
申请人： Dolby International AB
发明人： KJOERLING, Kristofer , VILLEMOES, Lars , PURNHAGEN, Heiko , EKSTRAND, Per
IPC分类号： G10L21/038 , G10L19/00 , G10L19/18
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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