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1. 发明申请

WO2010120394A2 METHOD FOR DETERMINING INVERSE FILTER FROM CRITICALLY BANDED IMPULSE RESPONSE DATA 审中-公开
标题翻译：用于从重要条带式冲突响应数据中确定反向滤波器的方法
公开(公告)号：WO2010120394A2
公开(公告)日：2010-10-21
申请号：PCT/US2010/020846
申请日：2010-01-13
申请人： DOLBY LABORATORIES LICENSING CORPORATION , BROWN, C. Phillip , EKSTRAND, Per , SEEFELDT, Alan J.
发明人： BROWN, C. Phillip , EKSTRAND, Per , SEEFELDT, Alan J.
IPC分类号： H04R3/04
CPC分类号： H04R29/001 , H04R3/04 , H04R2430/03
摘要： A method for determining an inverse filter for altering the frequency response of a loudspeaker so that with the inverse filter applied in the loudspeaker's signal path the inverse-filtered loudspeaker output has a target frequency response, and optionally also applying the inverse filter in the signal path, and a system configured (e.g., a general or special purpose processor programmed and configured) to determine an inverse filter. In some embodiments, the inverse filter corrects the magnitude of the loudspeaker's output. In other embodiments, the inverse filter corrects both the magnitude and phase of the loudspeaker's output. In some embodiments, the inverse filter is determined in the frequency domain by applying eigenfilter theory or minimizing a mean square error expression by solving a linear equation system.
摘要翻译：一种用于确定用于改变扬声器的频率响应的逆滤波器的方法，使得利用在扬声器信号路径中应用的反相滤波器，经滤波的扬声器输出具有目标频率响应，并且还可选地还在信号路径中应用逆滤波器以及配置（例如，编程和配置的通用或专用处理器）以确定逆滤波器的系统。在一些实施例中，逆滤波器校正扬声器输出的幅度。在其他实施例中，逆滤波器校正扬声器的输出的幅度和相位。在一些实施例中，通过应用特征滤波器理论或通过求解线性方程系统来最小化均方误差表达式，在频域中确定逆滤波器。

2. 发明申请

WO2021188953A1 BASS ENHANCEMENT FOR LOUDSPEAKERS 审中-公开
公开(公告)号：WO2021188953A1
公开(公告)日：2021-09-23
申请号：PCT/US2021/023239
申请日：2021-03-19
申请人： DOLBY INTERNATIONAL AB , DOLBY LABORATORIES LICENSING CORPORATION
发明人： EKSTRAND, Per , HAO, Yuxing , YU, Xuemei
IPC分类号： H04R3/04
摘要： A method of audio processing includes generating harmonics in a hybrid complex quadrature mirror filter domain. Generating the harmonics may include multiplication, using a feedback delay loop, and dynamic compression. The harmonics may be generated based on one or more hybrid sub-bands of the complex transform domain signal.

3. 发明申请

WO2019210068A1 INTEGRATION OF HIGH FREQUENCY RECONSTRUCTION TECHNIQUES WITH REDUCED POST-PROCESSING DELAY 审中-公开
公开(公告)号：WO2019210068A1
公开(公告)日：2019-10-31
申请号：PCT/US2019/029144
申请日：2019-04-25
申请人： DOLBY LABORATORIES LICENSING CORPORATION
发明人： KJOERLING, Kristofer , VILLEMOES, Lars , PURNHAGEN, Heiko , EKSTRAND, Per
IPC分类号： G10L21/038 , G10L21/02 , 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. The high frequency regeneration is performed as a post-processing operation with a delay of 3010 samples per audio channel.

4. 发明申请

WO2016149015A1 DECODING AUDIO BITSTREAMS WITH ENHANCED SPECTRAL BAND REPLICATION METADATA IN AT LEAST ONE FILL ELEMENT 审中-公开
标题翻译：用最小的一个填充元素解码具有增强的光谱带复制音频元素
公开(公告)号：WO2016149015A1
公开(公告)日：2016-09-22
申请号：PCT/US2016/021666
申请日：2016-03-10
申请人： DOLBY LABORATORIES LICENSING CORPORATION , 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.
摘要翻译：实施例涉及一种包括缓冲器，比特流有效载荷去格局化器和解码子系统的音频处理单元。缓冲器存储编码音频比特流的至少一个块。该块包括一个填充元素，以填充数据的标识符开始。填充数据包括至少一个标志，标识是否对块的音频内容执行增强的频谱带复制（eSBR）处理。还提供了用于解码编码音频比特流的相应方法。

5. 发明申请

WO2018175347A1 BACKWARD-COMPATIBLE INTEGRATION OF HARMONIC TRANSPOSER FOR HIGH FREQUENCY RECONSTRUCTION OF AUDIO SIGNALS 审中-公开
公开(公告)号：WO2018175347A1
公开(公告)日：2018-09-27
申请号：PCT/US2018/023183
申请日：2018-03-19
申请人： DOLBY INTERNATIONAL AB , DOLBY LABORATORIES LICENSING CORPORATION
发明人： VILLEMOES, Lars , PURNHAGEN, Heiko , EKSTRAND, Per
IPC分类号： G06F17/10 , G10L19/02 , G10L19/22 , G10L19/24 , G10L19/26
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.

6. 发明申请

WO2010086461A1 IMPROVED HARMONIC TRANSPOSITION 审中-公开
标题翻译：改进的谐波传输
公开(公告)号：WO2010086461A1
公开(公告)日：2010-08-05
申请号：PCT/EP2010/053222
申请日：2010-03-12
申请人： DOLBY INTERNATIONAL AB , EKSTRAND, Per , VILLEMOES, Lars, Falck
发明人： EKSTRAND, Per , VILLEMOES, Lars, Falck
IPC分类号： G10L19/02 , G10L21/02 , G10L21/04
CPC分类号： G10L19/022 , G10L19/0212 , G10L19/24 , G10L21/038 , G10L21/04
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 L a , 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.
摘要翻译：本发明涉及在时间和/或频率上转置信号，特别涉及音频信号的编码。更具体地，本发明涉及包括频域谐波转移器的高频重构（HFR）方法。描述了使用转置因子T从输入信号生成转置输出信号的方法和系统。该系统包括长度为La的分析窗口，提取输入信号的帧，以及将样本变换为M个复系数的阶数M的分析变换单元。 M是转置因子T的函数。该系统还包括通过使用转置因子T来改变复系数的相位的非线性处理单元，将改变的系数转换为M个改变的样本的阶数M的合成变换单元，以及合成窗口长度Ls，产生输出信号的帧。

7. 发明申请

WO2002080362A1 ALIASING REDUCTION USING COMPLEX-EXPONENTIAL MODULATED FILTERBANKS 审中-公开
标题翻译：使用复杂调制滤波器减少浪费
公开(公告)号：WO2002080362A1
公开(公告)日：2002-10-10
申请号：PCT/SE2002/000626
申请日：2002-03-28
申请人： CODING TECHNOLOGIES SWEDEN AB , EKSTRAND, Per
发明人： EKSTRAND, Per
IPC分类号： H03H17/00
CPC分类号： H03H17/0266
摘要： The present invention proposes a new method and apparatus for the improvement of digital filterbanks, by a complex extension of cosine modulated digital filterbanks. The invention employs complex-exponential modulation of a low-pass prototype filter and a new method for optimizing the characteristics of this filter. The invention substantially reduces artifacts due to aliasing emerging from independent modifications of subband signals, for example when using a filterbank as an spectral equalizer. The invention 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 invention offers essential improvements for various types of digital equalizers, adaptive filters, multiband companders and spectral envelope adjusting filterbanks used in high frequency reconstruction (HFR) systems.
摘要翻译：本发明提出了一种通过余弦调制数字滤波器组的复数扩展来改进数字滤波器组的新方法和装置。本发明采用低通原型滤波器的复指数调制和用于优化该滤波器的特性的新方法。本发明基本上减少了由于子带信号的独立修改引起的混叠所产生的伪像，例如当使用滤波器组作为频谱均衡器时。本发明优选地以在标准PC或数字信号处理器（DSP）上运行的软件实现，但也可以在定制芯片上被硬编码。本发明为用于高频重建（HFR）系统的各种类型的数字均衡器，自适应滤波器，多频带压缩器和频谱包络调整滤波器组提供了重要的改进。

8. 发明申请

WO2010094710A2 LOW DELAY MODULATED FILTER BANK 审中-公开
标题翻译：低延迟调制滤波器
公开(公告)号：WO2010094710A2
公开(公告)日：2010-08-26
申请号：PCT/EP2010/051993
申请日：2010-02-17
申请人： DOLBY INTERNATIONAL AB , EKSTRAND, Per
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 and a new method for optimizing the coefficients of this 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 filterbanks used in high frequency reconstruction (HFR) or parametric stereo systems.
摘要翻译：该文件涉及调制的次采样数字滤波器组，以及用于设计这种滤波器组的方法和系统。特别地，本文件提出了一种用于改进低延迟调制数字滤波器组的方法和装置。该方法采用非对称低通原型滤波器的调制和用于优化滤波器系数的新方法。此外，给出了使用（640）系数的原型滤波器长度和（319）个样本的系统延迟的（64）信道滤波器组的具体设计。该方法基本上减少了由于子带信号的独立修改引起的混叠所产生的伪像，例如当使用滤波器组作为频谱均衡器时。该方法优选地以在标准PC或数字信号处理器（DSP）上运行的软件实现，但也可以在定制芯片上被硬编码。该方法为各种类型的数字均衡器，自适应滤波器，多频带压缩器以及用于高频重构（HFR）或参数立体声系统的频谱包络调整滤波器组提供了改进。

9. 发明申请

WO2007031171A1 PARTIALLY COMPLEX MODULATED FILTER BANK 审中-公开
标题翻译：部分复杂调制滤波器
公开(公告)号：WO2007031171A1
公开(公告)日：2007-03-22
申请号：PCT/EP2006/008174
申请日：2006-08-18
申请人： CODING TECHNOLOGIES AB , EKSTRAND, Per , VILLEMOES, Lars , PURNHAGEN, Heiko
发明人： EKSTRAND, Per , VILLEMOES, Lars , PURNHAGEN, Heiko
IPC分类号： G10L19/02
CPC分类号： G10L19/0208
摘要： The present invention relates to an apparatus for processing a plurality of real-valued subband signals comprising a first real-valued subband signal and a second real-valued subband signal to provide at least a complex-valued subband signal with a multiband filter for providing an intermediate real-valued subband signal and a calculator for providing the complex-valued subband signal by combining a real-valued subband signal from the plurality of real-valued subband signals and the intermediate subband signal.
摘要翻译：本发明涉及一种用于处理多个实数子带信号的装置，包括第一实数子带信号和第二实数子带信号，以至少提供复数子带信号与多频带滤波器，以提供中间实数子带信号和用于通过组合来自多个实值子带信号和中间子带信号的实值子带信号来提供复值子带信号的计算器。

10. 发明申请

WO2003046891A1 METHODS FOR IMPROVING HIGH FREQUENCY RECONSTRUCTION 审中-公开
标题翻译：改进高频重构的方法
公开(公告)号：WO2003046891A1
公开(公告)日：2003-06-05
申请号：PCT/EP2002/013462
申请日：2002-11-28
申请人： CODING TECHNOLOGIES SWEDEN AB , KJÖRLING, Kristofer , EKSTRAND, Per , HÖRICH, Holger
发明人： KJÖRLING, Kristofer , EKSTRAND, Per , HÖRICH, Holger
IPC分类号： G10L21/02
CPC分类号： G10L19/0208 , G10L19/0017 , G10L19/0204 , G10L19/028 , G10L19/06 , G10L19/07 , G10L19/093 , G10L19/167 , G10L19/24 , G10L19/26 , G10L19/265 , G10L21/038
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 (703a) 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 (703b) and sent to the decoder, where it is combined with the output of the HFR unit.
摘要翻译：本发明提出了一种利用高频重构（HFR）来增强音频源编码系统的新方法和新装置。它利用编码器侧的检测机构（703a）来评估解码器中HFR方法将不能正确地再现频谱的哪些部分。关于此的信息被有效地编码（703b）并被发送到解码器，其中它与HFR单元的输出组合。

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