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1. 发明授权

US11562759B2 Integration of high frequency reconstruction techniques with reduced post-processing delay 有权
公开(公告)号：US11562759B2
公开(公告)日：2023-01-24
申请号：US17050664
申请日：2019-04-25
申请人： Dolby International AB
发明人： Kristofer Kjoerling , Lars Villemoes , Heiko Purnhagen , Per Ekstrand
IPC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.

2. 发明申请

US20220293116A1 DECODING AUDIO BITSTREAMS WITH ENHANCED SPECTRAL BAND REPLICATION METADATA IN AT LEAST ONE FILL ELEMENT 有权
公开(公告)号：US20220293116A1
公开(公告)日：2022-09-15
申请号：US17831234
申请日：2022-06-02
申请人： DOLBY INTERNATIONAL AB
发明人： Lars Villemoes , Heiko Purnhagen , Per Ekstrand
IPC分类号： G10L19/16 , G10L19/035 , G10L19/24 , G10L21/038
摘要： Embodiments relate to an audio processing unit that includes a bitstream payload deformatter and a decoding subsystem. The decoding subsystem is coupled to the bitstream payload deformatter and configured to decode at least a portion of a block of an encoded audio bitstream. The block includes a fill element with an identifier indicating a start of the fill element and fill data after the identifier. The fill data includes at least one flag identifying whether a base form of spectral band replication or an enhanced form of spectral band replication is to be performed on audio content of the block. The identifier is a three bit unsigned integer transmitted most significant bit first and having a value of 0x6.

3. 发明授权

US10694424B2 Non-uniform parameter quantization for advanced coupling 有权
公开(公告)号：US10694424B2
公开(公告)日：2020-06-23
申请号：US16454649
申请日：2019-06-27
申请人： DOLBY INTERNATIONAL AB
发明人： Heiko Purnhagen , Per Ekstrand
IPC分类号： H04W28/06 , H04W28/02 , H04S1/00 , G10L19/008 , G10L19/035 , G10L19/038
摘要： The present disclosure provides methods, devices and computer program products for non-uniform quantization of parameters. 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.

4. 发明授权

US10553232B2 Decoding audio bitstreams with enhanced spectral band replication metadata in at least one fill element 有权
公开(公告)号：US10553232B2
公开(公告)日：2020-02-04
申请号：US16040243
申请日：2018-07-19
申请人： DOLBY INTERNATIONAL AB
发明人： Lars Villemoes , Heiko Purnhagen , Per Ekstrand
IPC分类号： G10L19/16 , G10L19/035 , G10L19/24 , G10L21/038
摘要： Embodiments relate to an audio processing unit that includes a bitstream payload deformatter and a decoding subsystem. The decoding subsystem is coupled to the bitstream payload deformatter and configured to decode at least a portion of a block of an encoded audio bitstream. The block includes a fill element with an identifier indicating a start of the fill element and fill data after the identifier. The fill data includes at least one flag identifying whether a base form of spectral band replication or an enhanced form of spectral band replication is to be performed on audio content of the block. The identifier is a three bit unsigned integer transmitted most significant bit first and having a value of 0x6.

5. 发明授权

US10453468B2 Decoding audio bitstreams with enhanced spectral band replication metadata in at least one fill element 有权
公开(公告)号：US10453468B2
公开(公告)日：2019-10-22
申请号：US16269161
申请日：2019-02-06
申请人： DOLBY INTERNATIONAL AB
发明人： Lars Villemoes , Heiko Purnhagen , Per Ekstrand
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.

6. 发明申请

US20190189140A1 Spectral Translation/Folding in the Subband Domain 审中-公开
公开(公告)号：US20190189140A1
公开(公告)日：2019-06-20
申请号：US16274044
申请日：2019-02-12
申请人： Dolby International AB
发明人： Lars G. Liljeryd , Per Ekstrand , Fredrik Henn , Kristofer Kjoerling
IPC分类号： G10L19/02 , G10L21/038 , G10L19/26 , G10L19/00
CPC分类号： G10L19/0208 , G10L19/0017 , G10L19/0204 , G10L19/26 , G10L19/265 , G10L21/038
摘要： The present invention relates to a new method and apparatus for improvement of High Frequency Reconstruction (HFR) techniques using frequency translation or folding or a combination thereof. The proposed invention is applicable to audio source coding systems, and offers significantly reduced computational complexity. This is accomplished by means of frequency translation or folding in the subband domain, preferably integrated with spectral envelope adjustment in the same domain. The concept of dissonance guard-band filtering is further presented. The proposed invention offers a low-complexity, intermediate quality HFR method useful in speech and natural audio coding applications.

7. 发明申请

US20190119753A1 Oversampling in a Combined Transposer Filterbank 审中-公开
公开(公告)号：US20190119753A1
公开(公告)日：2019-04-25
申请号：US16223112
申请日：2018-12-18
申请人： Dolby International AB
发明人： Lars Villemoes , Per Ekstrand
IPC分类号： C12Q1/6883
CPC分类号： C12Q1/6883 , C12Q2600/118 , C12Q2600/156 , G10L19/0204 , G10L19/022 , G10L19/265 , G10L21/038
摘要： The present invention relates to coding of audio signals, and in particular to high frequency reconstruction methods including a frequency domain harmonic transposer. A system and 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 (501) comprising an analysis transformation unit (601) having a frequency resolution of Δf; and an analysis window (611) having a duration of DA; the analysis filter bank (501) being configured to provide a set of analysis subband signals from the low frequency component of the signal; a nonlinear processing unit (502, 650) configured to determine a set of synthesis subband signals based on a portion of the set of analysis subband signals, wherein the portion of the set of analysis subband signals is phase shifted by a transposition order T; and a synthesis filter bank (504) comprising a synthesis transformation unit (602) having a frequency resolution of QΔf; and a synthesis window (612) having a duration of DS; the synthesis filter bank (504) being configured to generate the high frequency component of the signal from the set of synthesis subband signals; wherein Q is a frequency resolution factor with Q1 and smaller than the transposition order T; and wherein the value of the product of the frequency resolution Δf and the duration DA of the analysis filter bank is selected based on the frequency resolution factor Q.

8. 发明授权

US10262669B1 Decoding audio bitstreams with enhanced spectral band replication metadata in at least one fill element 有权
公开(公告)号：US10262669B1
公开(公告)日：2019-04-16
申请号：US16208325
申请日：2018-12-03
申请人： DOLBY INTERNATIONAL AB
发明人： Lars Villemoes , Heiko Purnhagen , Per Ekstrand
IPC分类号： G10L19/16 , G10L21/038 , G10L19/24 , 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.

9. 发明授权

US10186280B2 Oversampling in a combined transposer filterbank 有权
公开(公告)号：US10186280B2
公开(公告)日：2019-01-22
申请号：US15792956
申请日：2017-10-25
申请人： Dolby International AB
发明人： Lars Villemoes , Per Ekstrand
IPC分类号： G10L21/038 , G10L19/26 , G10L19/02 , G10L19/022
摘要： The present invention relates to coding of audio signals, and in particular to high frequency reconstruction methods including a frequency domain harmonic transposer. A system and 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 (501) comprising an analysis transformation unit (601) having a frequency resolution of Δf; and an analysis window (611) having a duration of DA; the analysis filter bank (501) being configured to provide a set of analysis subband signals from the low frequency component of the signal; a nonlinear processing unit (502, 650) configured to determine a set of synthesis subband signals based on a portion of the set of analysis subband signals, wherein the portion of the set of analysis subband signals is phase shifted by a transposition order T; and a synthesis filter bank (504) comprising a synthesis transformation unit (602) having a frequency resolution of QΔf; and a synthesis window (612) having a duration of DS; the synthesis filter bank (504) being configured to generate the high frequency component of the signal from the set of synthesis subband signals; wherein Q is a frequency resolution factor with Q≥1 and smaller than the transposition order T; and wherein the value of the product of the frequency resolution Δf and the duration DA of the analysis filter bank is selected based on the frequency resolution factor Q.

10. 发明申请

US20180322889A1 DECODING AUDIO BITSTREAMS WITH ENHANCED SPECTRAL BAND REPLICATION METADATA IN AT LEAST ONE FILL ELEMENT 审中-公开
公开(公告)号：US20180322889A1
公开(公告)日：2018-11-08
申请号：US16040243
申请日：2018-07-19
申请人： DOLBY INTERNATIONAL AB
发明人： Lars Villemoes , Heiko Purnhagen , Per Ekstrand
IPC分类号： G10L19/16 , G10L21/038 , G10L19/035 , G10L19/24
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.

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