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1. 发明公开

EP4148729A1 APPARATUS, METHOD AND PROGRAM FOR DOWNSAMPLING AN AUDIO SIGNAL 审中-实审
公开(公告)号：EP4148729A1
公开(公告)日：2023-03-15
申请号：EP22203358.1
申请日：2011-03-04
申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. , Dolby International AB
发明人： Villemoes, Lars , Ekstrand, Per , Disch, Sascha , Nagel, Frederik , Wilde, Stephan
IPC分类号： G10L19/02 , G10L21/04 , G10L21/038
摘要： An apparatus for downsampling an audio signal comprise a first filter bank (102, 601, 2302) for generating a plurality of subband signals from the audio signal, wherein a sampling rate of the subband signals is smaller than a sampling rate of the audio signal; at least one synthesis filter bank (602-2, 2304) followed by an analysis filter bank (603-2, 2307) for performing a sample rate conversion to obtain a sample rate converted signal, the synthesis filter bank (602-2) having a number of channels different from a number of channels of the analysis filter bank (603-2); a time stretch processor (604-2, 2309) for processing the sample rate converted signal to obtain a time stretched signal; and a combiner (605, 2311) for combining the time stretched signal and a low-band signal or a different time stretched signal.

2. 发明授权

EP3246919B1 IMPROVED HARMONIC TRANSPOSITION 有权转让
公开(公告)号：EP3246919B1
公开(公告)日：2020-08-26
申请号：EP17175871.7
申请日：2010-03-12
申请人： Dolby International AB
发明人： Ekstrand, Per , Villemoes, Lars Falck
IPC分类号： G10L21/04 , G10L19/022 , G10L21/038

3. 发明公开

EP2800094A1 Oversampling in a combined transposer filter bank 有权转让
标题翻译： überabtastung在einer kombinierten Umsetzer-Filterbank
公开(公告)号：EP2800094A1
公开(公告)日：2014-11-05
申请号：EP14173151.3
申请日：2010-05-25
申请人： Dolby International AB
发明人： Villemoes, Lars , Ekstrand, Per
IPC分类号： G10L21/038
CPC分类号： G10L21/038 , G10L19/0204 , G10L19/022 , G10L19/265
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 Δ f ; and an analysis window (611) having a duration of D A ; 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 Q Δ f ; and a synthesis window (612) having a duration of D s ; 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 Δ f and the duration D A of the analysis filter bank is selected based on the frequency resolution factor Q .
摘要翻译：本发明涉及音频信号的编码，特别涉及包括频域谐波变换器的高频重构方法。描述用于从信号的低频分量产生信号的高频分量的系统和方法。该系统包括分析滤波器组（501），其包括频率分辨率为“f”的分析变换单元（601）和具有持续时间D A的分析窗口（611）; 所述分析滤波器组（501）被配置为从所述信号的低频分量提供一组分析子带信号; 非线性处理单元（502,650），被配置为基于所述一组分析子带信号的一部分来确定合成子带信号的集合，其中所述一组分析子带信号的所述部分被相移移位T; 和具有频率分辨率为Q“f的合成变换单元（602）的合成滤波器组（504）和具有持续时间D s的合成窗口（612）; 所述合成滤波器组（504）被配置为从所述一组合成子带信号中产生所述信号的高频分量; 其中Q是频率分辨率因子，Q‰1，小于转置次数T; 并且其中基于频率分辨率因子Q选择频率分辨率“f”和“分析滤波器组的持续时间D A”的乘积值。

4. 发明公开

EP2720477A1 Virtual bass synthesis using harmonic transposition 有权转让
标题翻译： Virtuelle Basssynthese mit harmonischer换位
公开(公告)号：EP2720477A1
公开(公告)日：2014-04-16
申请号：EP13188415.7
申请日：2013-10-14
申请人： Dolby International AB
发明人： Ekstrand, Per
IPC分类号： H04R3/04 , G10L21/02
CPC分类号： H04R3/04 , G10L21/038 , H04R2430/03
摘要： In some embodiments, a virtual bass generation method including steps of: performing harmonic transposition on low frequency components of an input audio signal (typically, bass frequency components expected to be inaudible during playback of the input audio signal using an expected speaker or speaker set) to generate transposed data indicative of harmonics (which are expected to be audible during playback, using the expected speaker(s), of an enhanced version of the input audio which includes the harmonics); generating an enhancement signal in response to the transposed data; and generating an enhanced audio signal by combining (e.g., mixing) the enhancement signal with the input audio signal. Other aspects are systems (e.g., programmed processors) and devices (e.g., devices having physically-limited bass reproduction capabilities, such as, for example, a notebook, tablet, mobile phone, or other device with small speakers) configured to perform any embodiment of the method.
摘要翻译：在一些实施例中，虚拟低音产生方法包括以下步骤：在输入音频信号的低频分量上执行谐波转置（通常，使用期望的扬声器或扬声器组，在输入音频信号的回放期间预期听不到的低音频率分量）以产生表示谐波的转移数据（预期在播放期间使用包括谐波的输入音频的增强版本的预期扬声器可听见）; 响应于所转置的数据产生增强信号; 以及通过将增强信号与输入音频信号进行组合（例如，混合）来生成增强音频信号。其他方面是被配置为执行任何实施例的系统（例如，编程处理器）和设备（例如，具有物理限制的低音再现功能的设备，例如笔记本，平板电脑，移动电话或具有小型扬声器的其他设备）的方法。

5. 发明公开

EP3246919A1 IMPROVED HARMONIC TRANSPOSITION 有权转让
标题翻译：改进的谐波转换
公开(公告)号：EP3246919A1
公开(公告)日：2017-11-22
申请号：EP17175871.7
申请日：2010-03-12
申请人： Dolby International AB
发明人： Ekstrand, Per , Villemoes, Lars Falck
IPC分类号： G10L21/04 , G10L19/022 , G10L21/038
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 L s , generating a frame of the output signal.
摘要翻译：本发明涉及按时间和/或频率转置信号，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置器的高频重建（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，以及阶次M的分析变换单元，将样本变换成M个复系数。 M是转置因子T的函数。该系统进一步包括非线性处理单元，通过使用转置因子T改变复系数的相位，将改变的系数转换成M个改变的采样的阶M的合成转换单元，以及合成窗口的长度为Ls，生成输出信号的一帧。

6. 发明授权

EP2720477B1 Virtual bass synthesis using harmonic transposition 有权转让
标题翻译：虚拟贝司合成与谐波换位
公开(公告)号：EP2720477B1
公开(公告)日：2016-03-02
申请号：EP13188415.7
申请日：2013-10-14
申请人： Dolby International AB
发明人： Ekstrand, Per
IPC分类号： H04R3/04 , G10L21/02 , G10L21/038
CPC分类号： H04R3/04 , G10L21/038 , H04R2430/03

7. 发明公开

EP2953131A1 IMPROVED HARMONIC TRANSPOSITION 有权转让
标题翻译： VERBESSERTE HARMONISCHE TRANSPOSITION
公开(公告)号：EP2953131A1
公开(公告)日：2015-12-09
申请号：EP15176581.5
申请日：2010-03-12
申请人： Dolby International AB
发明人： Ekstrand, Per , Villemoes, Lars Falck
IPC分类号： G10L21/04 , G10L19/022 , G10L21/038
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 L s , 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L a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。系统还包括非线性处理单元，通过使用转置因子T改变复系数的相位，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，以及长度L s的合成窗口，产生输出信号的帧。

8. 发明授权

EP2674943B1 Improved harmonic transposition 有权转让
标题翻译：改进和声换位
公开(公告)号：EP2674943B1
公开(公告)日：2015-09-02
申请号：EP13182785.9
申请日：2010-03-12
申请人： Dolby International AB
发明人： Ekstrand, Per , Villemoes, Lars, Falck
IPC分类号： G10L21/04 , G10L19/022 , G10L21/038
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 L s , generating a frame of the output signal.

9. 发明公开

EP2674943A2 Improved harmonic transposition 有权转让
标题翻译： Verbesserte harmonische转置
公开(公告)号：EP2674943A2
公开(公告)日：2013-12-18
申请号：EP13182785.9
申请日：2010-03-12
申请人： Dolby International AB
发明人： Ekstrand, Per , Villemoes, Lars, Falck
IPC分类号： G10L21/04 , G10L19/022 , G10L21/038
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 L s , 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L a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。系统还包括非线性处理单元，通过使用转置因子T改变复系数的相位，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，以及长度L s的合成窗口，产生输出信号的帧。

10. 发明授权

EP2800093B1 Efficient combined harmonic transposition 有权转让
标题翻译：高效的组合谐波换位
公开(公告)号：EP2800093B1
公开(公告)日：2017-12-27
申请号：EP14173150.5
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： 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 .

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