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71. 发明申请

US20070100607A1 TIME WARPED MODIFIED TRANSFORM CODING OF AUDIO SIGNALS 有权
标题翻译：时间修改音频信号的变换编码
公开(公告)号：US20070100607A1
公开(公告)日：2007-05-03
申请号：US11464176
申请日：2006-08-11
申请人： Lars Villemoes
发明人： Lars Villemoes
IPC分类号： G10L11/04
CPC分类号： G10L19/002 , G10L19/0212 , G10L19/022
摘要： A spectral representation of an audio signal having consecutive audio frames can be derived more efficiently, when a common time warp is estimated for any two neighbouring frames, such that a following block transform can additionally use the warp information. Thus, window functions required for successful application of an overlap and add procedure during reconstruction can be derived and applied, the window functions already anticipating the re-sampling of the signal due to the time warping. Therefore, the increased efficiency of block-based transform coding of time-warped signals can be used without introducing audible discontinuities.
摘要翻译：当为任何两个相邻帧估计公共时间扭曲时，可以更有效地导出具有连续音频帧的音频信号的频谱表示，使得随后的块变换可以另外使用经线信息。因此，可以导出并应用在重建期间成功应用重叠和添加过程所需的窗口功能，窗函数已经预期由于时间扭曲而对信号的重新采样。因此，可以使用时间扭曲信号的基于块的变换编码的增加的效率而不引入可听不连续性。

72. 发明申请

US20060239473A1 Envelope shaping of decorrelated signals 有权
标题翻译：去相关信号的信封整形
公开(公告)号：US20060239473A1
公开(公告)日：2006-10-26
申请号：US11402519
申请日：2006-04-12
申请人： Kristofer Kjorling , Jurgen Herre , Sascha Disch , Lars Villemoes
发明人： Kristofer Kjorling , Jurgen Herre , Sascha Disch , Lars Villemoes
IPC分类号： H03G5/00
CPC分类号： H04S7/307 , G10L19/008 , G10L19/02 , G10L19/26 , H04S3/00 , H04S5/005 , H04S2420/03
摘要： The envelope of a decorrelated signal derived from an original signal can be shaped without introducing additional distortion, when a spectral flattener is used to spectrally flatten the spectrum of the decorrelated signal and the original signal prior to using the flattened spectra for deriving a gain factor describing the energy distribution between the flattened spectra, and when the so derived gain factor is used by an envelope shaper to timely shape the envelope of the decorrelated signal.
摘要翻译：当原始信号得到的去相关信号的包络线可以被成形，而不引入额外的失真，当使用光谱平滑器在光谱平坦化去相关信号的频谱和原始信号之前，在使用平坦的光谱以得出描述的增益因子之前平坦化光谱之间的能量分布，以及当衍生的增益因子被信封整形器用于及时地形成去相关信号的包络时。

73. 发明授权

US09524726B2 Audio signal decoder, audio signal encoder, method for decoding an audio signal, method for encoding an audio signal and computer program using a pitch-dependent adaptation of a coding context 有权
标题翻译：音频信号解码器，音频信号编码器，用于解码音频信号的方法，用于对音频信号进行编码的方法和使用编码上下文的音调依赖性调整的计算机程序
公开(公告)号：US09524726B2
公开(公告)日：2016-12-20
申请号：US13608980
申请日：2012-09-10
申请人： Stefan Bayer , Tom Baeckstroem , Ralf Geiger , Bernd Edler , Sascha Disch , Lars Villemoes
发明人： Stefan Bayer , Tom Baeckstroem , Ralf Geiger , Bernd Edler , Sascha Disch , Lars Villemoes
IPC分类号： G10L19/14 , G10L19/022 , G10L19/02 , G10L25/90
CPC分类号： G10L19/022 , G10L19/0212 , G10L25/90
摘要： An audio signal decoder includes a context-based spectral value decoder configured to decode a codeword describing one or more spectral values or at least a portion of a number representation thereof in dependence on a context state. The audio signal decoder also includes a context state determinator configured to determine a current context state in dependence on one or more previously decoded spectral values and a time warping frequency-domain-to-time-domain converter configured to provide a time-warped time-domain representation of a given audio frame on the basis of a set of decoded spectral values provided by the context-based spectral value decoder and in dependence on the time warp information. The context-state determinator is configured to adapt the determination of the context state to a change of a fundamental frequency between subsequent audio frames. An audio signal encoder applies a comparable concept.
摘要翻译：音频信号解码器包括基于上下文的频谱值解码器，其被配置为根据上下文状态来解码描述一个或多个频谱值的码字或其数字表示的至少一部分。音频信号解码器还包括上下文状态确定器，其被配置为根据一个或多个先前解码的频谱值确定当前上下文状态，以及时间扭曲频域 - 时域转换器，被配置为提供时间扭曲的时域 - 基于由基于上下文的频谱值解码器提供的解码频谱值的集合并且依赖于时间扭曲信息，给定音频帧的域表示。上下文状态确定器被配置为使上下文状态的确定适应随后的音频帧之间的基频的改变。音频信号编码器应用可比较的概念。

74. 发明授权

US08818541B2 Cross product enhanced harmonic transposition 有权
标题翻译：交叉乘积增强谐波转置
公开(公告)号：US08818541B2
公开(公告)日：2014-08-26
申请号：US13144346
申请日：2010-01-15
申请人： Lars Villemoes , Per Hedelin
发明人： Lars Villemoes , Per Hedelin
IPC分类号： G10L19/02 , G10L21/0388
CPC分类号： G10L19/265 , G10L19/02 , G10L21/0388
摘要： The present invention relates to audio coding systems which make use of a harmonic transposition method for high frequency reconstruction (HFR). A system and a 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 providing a plurality of analysis subband signals of the low frequency component of the signal. It also comprises a non-linear processing unit to generate a synthesis subband signal with a synthesis frequency by modifying the phase of a first and a second of the plurality of analysis subband signals and by combining the phase-modified analysis subband signals. Finally, it comprises a synthesis filter bank for generating the high frequency component of the signal from the synthesis subband signal.
摘要翻译：本发明涉及利用高频重构（HFR）的谐波转置方法的音频编码系统。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。该系统包括提供信号的低频分量的多个分析子带信号的分析滤波器组。它还包括非线性处理单元，用于通过修改多个分析子带信号中的第一和第二分析子相位的相位并通过组合相位修正的分析子带信号来产生具有合成频率的合成子带信号。最后，它包括一个合成滤波器组，用于从合成子带信号产生信号的高频分量。

75. 发明授权

US08498876B2 Method for reduction of aliasing introduced by spectral envelope adjustment in real-valued filterbanks 有权
公开(公告)号：US08498876B2
公开(公告)日：2013-07-30
申请号：US13552598
申请日：2012-07-18
申请人： Kristofer Kjorling , Lars Villemoes
发明人： Kristofer Kjorling , Lars Villemoes
IPC分类号： G10L19/00
CPC分类号： G10L19/0204 , G10L19/00 , G10L19/025 , G10L19/083 , G10L19/12 , G10L19/26 , G10L25/12 , G10L25/18 , G10L25/21 , G10L25/48 , H03H17/0266
摘要： The present invention proposes a new method for improving the performance of a real-valued filterbank based spectral envelope adjuster. By adaptively locking the gain values for adjacent channels dependent on the sign of the channels, as defined in the application, reduced aliasing is achieved. Furthermore, the grouping of the channels during gain-calculation, gives an improved energy estimate of the real valued subband signals in the filterbank.

76. 发明申请

US20130073296A1 AUDIO SIGNAL DECODER, AUDIO SIGNAL ENCODER, METHODS AND COMPUTER PROGRAM USING A SAMPLING RATE DEPENDENT TIME-WARP CONTOUR ENCODING 有权
标题翻译：音频信号解码器，音频信号编码器，使用采样速率的方法和计算机程序依赖于时间波形编码
公开(公告)号：US20130073296A1
公开(公告)日：2013-03-21
申请号：US13604869
申请日：2012-09-06
申请人： Stefan Bayer , Tom Baeckstroem , Ralf Reiger , Bernd Edler , Sascha Disch , Lars Villemoes
发明人： Stefan Bayer , Tom Baeckstroem , Ralf Reiger , Bernd Edler , Sascha Disch , Lars Villemoes
IPC分类号： G10L19/00
CPC分类号： G10L19/022 , G10L19/0212 , G10L25/90
摘要： An audio signal decoder configured to provide a decoded audio signal representation on the basis of an encoded audio signal representation including a sampling frequency information, an encoded time warp information and an encoded spectrum representation includes a time warp calculator and a warp decoder. The time warp calculator is configured to adapt a mapping rule for mapping codewords of the encoded time warp information onto decoded time warp values describing the decoded time warp information in dependence on the sampling frequency information. The warp decoder is configured to provide the decoded audio signal representation on the basis of the encoded spectrum representation and in dependence on the decoded time warp information.
摘要翻译：音频信号解码器被配置为基于包括采样频率信息，编码时间扭曲信息和编码频谱表示的编码音频信号表示来提供解码音频信号表示，包括时间扭曲计算器和扭曲解码器。时间扭曲计算器被配置成适应用于将编码的时间扭曲信息的码字映射到根据采样频率信息描述解码的时间扭曲信息的解码的时间扭曲值的映射规则。翘曲解码器被配置为基于编码的频谱表示并且依赖于解码的时间扭曲信息来提供解码的音频信号表示。

77. 发明授权

US08346566B2 Method for reduction of aliasing introduced by spectral envelope adjustment in real-valued filterbanks 有权
公开(公告)号：US08346566B2
公开(公告)日：2013-01-01
申请号：US12872482
申请日：2010-08-31
申请人： Kristofer Kjoerling , Lars Villemoes
发明人： Kristofer Kjoerling , Lars Villemoes
IPC分类号： G10L19/00
CPC分类号： G10L19/0204 , G10L19/00 , G10L19/025 , G10L19/083 , G10L19/12 , G10L19/26 , G10L25/12 , G10L25/18 , G10L25/21 , G10L25/48 , H03H17/0266
摘要： The present invention proposes a new method for improving the performance of a real-valued filterbank based spectral envelope adjuster. By adaptively locking the gain values for adjacent channels dependent on the sign of the channels, as defined in the application, reduced aliasing is achieved. Furthermore, the grouping of the channels during gain-calculation, gives an improved energy estimate of the real valued subband signals in the filterbank.

78. 发明授权

US08145475B2 Method for reduction of aliasing introduced by spectral envelope adjustment in real-valued filterbanks 有权
公开(公告)号：US08145475B2
公开(公告)日：2012-03-27
申请号：US12473075
申请日：2009-05-27
申请人： Kristofer Kjoerling , Lars Villemoes
发明人： Kristofer Kjoerling , Lars Villemoes
IPC分类号： G10L19/00
CPC分类号： G10L19/0204 , G10L19/00 , G10L19/025 , G10L19/083 , G10L19/12 , G10L19/26 , G10L25/12 , G10L25/18 , G10L25/21 , G10L25/48 , H03H17/0266
摘要： The present invention proposes a new method for improving the performance of a real-valued filterbank based spectral envelope adjuster. By adaptively locking the gain values for adjacent channels dependent on the sign of the channels, as defined in the application, reduced aliasing is achieved. Furthermore, the grouping of the channels during gain-calculation, gives an improved energy estimate of the real valued subband signals in the filterbank.

79. 发明授权

US08108209B2 Method for reduction of aliasing introduced by spectral envelope adjustment in real-valued filterbanks 有权
标题翻译：减少由实数滤波器组中的频谱包络调整引入的混叠的方法
公开(公告)号：US08108209B2
公开(公告)日：2012-01-31
申请号：US12472147
申请日：2009-05-26
申请人： Kristofer Kjoerling , Lars Villemoes
发明人： Kristofer Kjoerling , Lars Villemoes
IPC分类号： G10L19/00
CPC分类号： G10L19/0204 , G10L19/00 , G10L19/025 , G10L19/083 , G10L19/12 , G10L19/26 , G10L25/12 , G10L25/18 , G10L25/21 , G10L25/48 , H03H17/0266
摘要： The present invention proposes a new method for improving the performance of a real-valued filterbank based spectral envelope adjuster. By adaptively locking the gain values for adjacent channels dependent on the sign of the channels, as defined in the application, reduced aliasing is achieved. Furthermore, the grouping of the channels during gain-calculation, gives an improved energy estimate of the real valued subband signals in the filterbank.
摘要翻译：本发明提出了一种用于提高基于实数滤波器组的频谱包络调节器的性能的新方法。通过自适应地锁定取决于通道的符号的相邻通道的增益值，如应用中定义的那样，实现了减少的混叠。此外，增益计算期间信道的分组给出了滤波器组中实值子带信号的改进的能量估计。

80. 发明授权

US07711552B2 Efficient filtering with a complex modulated filterbank 有权
标题翻译：用复调制滤波器组进行有效滤波
公开(公告)号：US07711552B2
公开(公告)日：2010-05-04
申请号：US11469790
申请日：2006-09-01
申请人： Lars Villemoes
发明人： Lars Villemoes
IPC分类号： G10L21/00
CPC分类号： G10L19/02 , G10L19/0204 , H03H17/0266 , H03H17/0294 , H03H2218/04
摘要： A filter apparatus for filtering a time domain input signal to obtain a time domain output signal, which is a representation of the time domain input signal filtered using a filter characteristic having an non-uniform amplitude/frequency characteristic, comprises a complex analysis filter bank for generating a plurality of complex subband signals from the time domain input signals, a plurality of intermediate filters, wherein at least one of the intermediate filters of the plurality of the intermediate filters has a non-uniform amplitude/frequency characteristic, wherein the plurality of intermediate filters have a shorter impulse response compared to an impulse response of a filter having the filter characteristic, and wherein the non-uniform amplitude/frequency characteristics of the plurality of intermediate filters together represent the non-uniform filter characteristic, and a complex synthesis filter bank for synthesizing the output of the intermediate filters to obtain the time domain output signal.
摘要翻译：一种用于对时域输入信号进行滤波以获得时域输出信号的滤波器装置，其是使用具有不均匀幅度/频率特性的滤波器特性滤波的时域输入信号的表示，包括复分析滤波器组，用于从所述时域输入信号产生多个复数子带信号，多个中间滤波器，其中所述多个中间滤波器中的至少一个中间滤波器具有不均匀的幅度/频率特性，其中所述多个中间滤波器与具有滤波器特性的滤波器的脉冲响应相比，滤波器具有更短的脉冲响应，并且其中多个中间滤波器的非均匀幅度/频率特性一起表示非均匀滤波器特性，并且复合成滤波器组用于合成中间滤波器的输出以获得时间域输出信号。

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