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1. 发明公开

US20240271217A1 OVERSAMPLING IN A COMBINED TRANSPOSER FILTERBANK 审中-公开
公开(公告)号：US20240271217A1
公开(公告)日：2024-08-15
申请号：US18637814
申请日：2024-04-17
申请人： Dolby International AB
发明人： Lars VILLEMOES , Per EKSTRAND
IPC分类号： C12Q1/6883 , G10L19/02 , G10L19/022 , G10L19/26 , G10L21/038
CPC分类号： C12Q1/6883 , G10L19/0204 , G10L19/022 , G10L19/265 , G10L21/038 , C12Q2600/118 , C12Q2600/156
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.

2. 发明公开

US20240087590A1 INTEGRATION OF HIGH FREQUENCY AUDIO RECONSTRUCTION TECHNIQUES 审中-公开
公开(公告)号：US20240087590A1
公开(公告)日：2024-03-14
申请号：US18508415
申请日：2023-11-14
申请人： DOLBY INTERNATIONAL AB
发明人： Kristofer KJOERLING , Lars VILLEMOES , Heiko PURNHAGEN , Per EKSTRAND
IPC分类号： G10L21/0388 , G10L19/008 , G10L19/02 , H04S3/00
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.

3. 发明申请

US20230049695A1 BACKWARD-COMPATIBLE INTEGRATION OF HIGH FREQUENCY RECONSTRUCTION TECHNIQUES FOR AUDIO SIGNALS 有权
公开(公告)号：US20230049695A1
公开(公告)日：2023-02-16
申请号：US17973406
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.

4. 发明申请

US20210383817A1 Harmonic Transposition in an Audio Coding Method and System 有权
公开(公告)号：US20210383817A1
公开(公告)日：2021-12-09
申请号：US17409592
申请日：2021-08-23
申请人： Dolby International AB
发明人： Per EKSTRAND , Lars VILLEMOES
IPC分类号： G10L19/022 , G10L19/24 , G10L21/038 , G10L21/04 , G10L19/02
摘要： The present invention relates to transposing signals in time and/or frequency and in particular to coding of audio signals. More particular, the present invention relates to high frequency reconstruction (HFR) methods including a frequency domain harmonic transposer. A method and system for generating a transposed output signal from an input signal using a transposition factor T is described. The system comprises an analysis window of length La, extracting a frame of the input signal, and an analysis transformation unit of order M transforming the samples into M complex coefficients. M is a function of the transposition factor T. The system further comprises a nonlinear processing unit altering the phase of the complex coefficients by using the transposition factor T, a synthesis transformation unit of order M transforming the altered coefficients into M altered samples, and a synthesis window of length Ls, generating a frame of the output signal.

5. 发明申请

US20210269880A1 Oversampling in a Combined Transposer Filter Bank 有权
公开(公告)号：US20210269880A1
公开(公告)日：2021-09-02
申请号：US17201107
申请日：2021-03-15
申请人： Dolby International AB
发明人： Lars VILLEMOES , Per EKSTRAND
IPC分类号： C12Q1/6883 , 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.

6. 发明申请

US20160267917A1 DEVICE AND METHOD FOR IMPROVED MAGNITUDE RESPONSE AND TEMPORAL ALIGNMENT IN A PHASE VOCODER BASED BANDWIDTH EXTENSION METHOD FOR AUDIO SIGNALS 有权
公开(公告)号：US20160267917A1
公开(公告)日：2016-09-15
申请号：US15071569
申请日：2016-03-16
申请人： Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V. , Dolby International AB
发明人： Sascha DISCH , Frederik NAGEL , Stephan WILDE , Lars VILLEMOES , Per EKSTRAND
IPC分类号： G10L19/02 , G10L19/26 , G10L19/16 , G10L19/022
CPC分类号： G10L19/0208 , G10L19/022 , G10L19/16 , G10L19/26 , G10L21/038
摘要： An apparatus for generating a bandwidth extended audio signal from an input signal, includes a patch generator for generating one or more patch signals from the input signal, wherein the patch generator is configured for performing a time stretching of subband signals from an analysis filterbank, and wherein the patch generator further includes a phase adjuster for adjusting phases of the subband signals using a filterbank-channel dependent phase correction.

7. 发明申请

US20160210970A1 Frequency Band Table Design for High Frequency Reconstruction Algorithms 有权
标题翻译：高频重构算法的频带表设计
公开(公告)号：US20160210970A1
公开(公告)日：2016-07-21
申请号：US14914524
申请日：2014-08-11
申请人： DOLBY INTERNATIONAL AB
发明人： Per EKSTRAND , Kristofer KJOERLING
IPC分类号： G10L19/002 , G10L19/02
CPC分类号： G10L19/002 , G10L19/0204 , G10L19/0208 , G10L21/0388 , G10L2019/0001
摘要： The present document relates to audio encoding and decoding. In particular, the present document relates to audio coding schemes which make use of high frequency reconstruction (HFR) methods. A system configured to determine a master scale factor band table of a highband signal (105) of an audio signal is described. The highband signal (105) is to be generated from a lowband signal (101) of the audio signal using a high frequency reconstruction (HFR) scheme. The master scale factor band table is indicative of a frequency resolution of a spectral envelope of the highband signal (105).
摘要翻译：本文件涉及音频编码和解码。特别地，本文件涉及利用高频重构（HFR）方法的音频编码方案。描述了被配置为确定音频信号的高频带信号（105）的主比例因子带表的系统。高频信号（105）将使用高频重构（HFR）方案从音频信号的低频带信号（101）生成。主比例因子带表表示高频信号（105）的频谱包络的频率分辨率。

8. 发明公开

US20230395089A1 GENERATIVE NEURAL NETWORK MODEL FOR PROCESSING AUDIO SAMPLES IN A FILTER-BANK DOMAIN 审中-公开
公开(公告)号：US20230395089A1
公开(公告)日：2023-12-07
申请号：US18248808
申请日：2021-10-15
申请人： DOLBY INTERNATIONAL AB
发明人： Per EKSTRAND , Janusz KLESJA , Pedro Jafeth VILLASANA TINAJERO , Lars VILLEMOES
IPC分类号： G10L21/0208 , G10L25/30
CPC分类号： G10L21/0208 , G10L25/30
摘要： A neural network system is provided, implementing a generative model for autoregressively generating a distribution for a plurality of current filter-bank samples of an audio signal, wherein the current samples correspond to a current time slot, and each current sample corresponds to a channel of the filter-bank. The system includes a hierarchy of a plurality of neural network processing tiers ordered from a top to a bottom tier, each tier trained to generate conditioning information based on previous filter-bank samples and, for at least each tier but the top tier, also on the conditioning information from a tier higher up in the hierarchy, and an output stage trained to generate the probability distribution based on previous samples for one or more previous time slots and the conditioning information from the lowest processing tier.

9. 发明公开

US20230197102A1 INTEGRATION OF HIGH FREQUENCY AUDIO RECONSTRUCTION TECHNIQUES 审中-公开
公开(公告)号：US20230197102A1
公开(公告)日：2023-06-22
申请号：US18113397
申请日：2023-02-23
申请人： Dolby International AB
发明人： Kristofer KJOERLING , Lars VILLEMOES , Heiko PURNHAGEN , Per EKSTRAND
IPC分类号： G10L21/0388 , G10L19/008 , G10L19/02 , H04S3/00
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.

10. 发明公开

US20230197101A1 INTEGRATION OF HIGH FREQUENCY AUDIO RECONSTRUCTION TECHNIQUES 审中-公开
公开(公告)号：US20230197101A1
公开(公告)日：2023-06-22
申请号：US18113391
申请日：2023-02-23
申请人： Dolby International AB
发明人： Kristofer KJOERLING , Lars VILLEMOES , Heiko PURNHAGEN , Per EKSTRAND
IPC分类号： G10L21/0388 , G10L19/008 , G10L19/02 , H04S3/00
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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