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71. 发明申请

US20090259479A1 METHOD FOR REDUCTION OF ALIASING INTRODUCED BY SPECTRAL ENVELOPE ADJUSTMENT IN REAL-VALUED FILTERBANKS 有权
标题翻译：用于减少真实值滤波器中光谱环境调整引起的干扰的方法
公开(公告)号：US20090259479A1
公开(公告)日：2009-10-15
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 , H04B15/00
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。

72. 发明申请

US20060233379A1 Adaptive residual audio coding 有权
标题翻译：自适应残差音频编码
公开(公告)号：US20060233379A1
公开(公告)日：2006-10-19
申请号：US11247555
申请日：2005-10-11
申请人： Lars Villemoes , Francois Myburg
发明人： Lars Villemoes , Francois Myburg
IPC分类号： H04R5/00
CPC分类号： G10L19/008
摘要： An audio signal having at least two channels can be efficiently down-mixed into a downmix signal and a residual signal, when the down-mixing rule used depends on a spatial parameter that is derived from the audio signal and that is post-processed by a limiter to apply a certain limit to the derived spatial parameter with the aim of avoiding instabilities during the up-mixing or down-mixing process. By having a down-mixing rule that dynamically depends on parameters describing an interrelation between the audio channels, one can assure that the energy within the down-mixed residual signal is as minimal as possible, which is advantageous in the view of coding efficiency. By post processing the spatial parameter with a limiter prior to using it in the down-mixing, one can avoid instabilities in the down- or up-mixing, which otherwise could result in a disturbance of the spatial perception of the encoded or decoded audio signal.
摘要翻译：具有至少两个通道的音频信号可以被有效地下混合成降混信号和残留信号，当所使用的下混合规则取决于从音频信号导出的空间参数，并且被后处理时限制器对推导的空间参数应用一定的限制，目的是避免在上混合或下混合过程中的不稳定性。通过具有动态地取决于描述音频通道之间的相互关系的参数的下混合规则，可以确保下混合残差信号内的能量尽可能地最小，这在编码效率方面是有利的。通过在下混合中使用限幅器之前对空间参数进行后处理，可以避免下混合或上混合中的不稳定性，否则可能导致编码或解码的音频信号的空间感知的干扰。

73. 发明授权

US08983852B2 Efficient combined harmonic transposition 有权
标题翻译：有效的组合谐波转置
公开(公告)号：US08983852B2
公开(公告)日：2015-03-17
申请号：US13321910
申请日：2010-05-25
申请人： Per Ekstrand , Lars Villemoes , Per Hedelin
发明人： Per Ekstrand , Lars Villemoes , Per Hedelin
IPC分类号： G10L19/00
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 Δf, 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 FΔf; with F being a resolution factor, with F≧1; wherein the transposition order P is different from the resolution factor F.
摘要翻译：本文件涉及利用用于高频重构（HFR）的谐波转置方法的音频编码系统以及数字效果处理器，例如，所谓的兴奋剂，其中谐波失真的产生增加处理信号的亮度。尤其是; 描述了一种被配置为从信号的低频分量产生信号的高频分量的系统。该系统可以包括分析滤波器组（501），其被配置为提供来自所述信号的低频分量的一组分析子带信号信号; 其中所述一组分析子带信号包括至少两个分析子带信号; 其中所述分析滤波器组具有频率分辨率＆Dgr; f，所述系统还包括非线性处理单元（502），其被配置为使用转置顺序P从所述一组分析子带信号中确定一组合成子带信号; 其中所述合成子带信号集合包括所述一组分析子带信号的一部分，所述分析子带信号的相位偏移量是从所述置换顺序P导出的量; 以及合成滤波器组（504），被配置为从所述合成子带信号的集合生成所述信号的高频分量; 其中所述合成滤波器组（504）具有F＆Dgr; f的频率分辨率; F为分辨率因子，F≥1; 其中转置次数P与分辨率因子F不同

74. 发明授权

US08315859B2 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：US08315859B2
公开(公告)日：2012-11-20
申请号：US12726307
申请日：2010-03-17
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。

75. 发明申请

US20120284033A1 METHOD FOR REDUCTION OF ALIASING INTRODUCED BY SPECTRAL ENVELOPE ADJUSTMENT IN REAL-VALUED FILTERBANKS 有权
标题翻译：用于减少真实值滤波器中光谱环境调整引起的干扰的方法
公开(公告)号：US20120284033A1
公开(公告)日：2012-11-08
申请号：US13552590
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.
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。

76. 发明申请

US20120281859A1 APPARATUS AND METHOD FOR GENERATING A HIGH FREQUENCY AUDIO SIGNAL USING ADAPTIVE OVERSAMPLING 有权
标题翻译：使用自适应超声波产生高频音频信号的装置和方法
公开(公告)号：US20120281859A1
公开(公告)日：2012-11-08
申请号：US13503248
申请日：2010-05-25
申请人： Lars Villemoes , Per Ekstrand , Sascha Disch , Frederik Nagel , Stephan Wilde
发明人： Lars Villemoes , Per Ekstrand , Sascha Disch , Frederik Nagel , Stephan Wilde
IPC分类号： H03G5/00
CPC分类号： G10L21/038 , G10L19/025
摘要： An apparatus for generating a high frequency audio signal that includes an analyzer for analyzing an input signal to determine a transient information adaptively. Additionally a spectral converter is provided for converting the input signal into an input spectral representation. A spectral processor processes the input spectral representation to generate a processed spectral representation including values for higher frequencies than the input spectral representation. A time converter is configured for converting the processed spectral representation to a time representation, wherein the spectral converter or the time converter are controllable to perform a frequency domain oversampling for the first portion of the input signal having the transient information associated and to not perform the frequency domain oversampling for the second portion of the input signal not having the associated transient information.
摘要翻译：一种用于产生高频音频信号的装置，包括用于分析输入信号的分析器，以自适应地确定瞬时信息。另外，提供了用于将输入信号转换为输入频谱表示的频谱转换器。频谱处理器处理输入频谱表示以产生包括比输入频谱表示更高频率的值的经处理的频谱表示。时间转换器被配置为将经处理的频谱表示转换为时间表示，其中频谱转换器或时间转换器是可控制的，以对具有相关联的瞬态信息的输入信号的第一部分执行频域过采样，并且不执行输入信号的第二部分不具有相关联的瞬态信息的频域过采样。

77. 发明申请

US20120271644A1 AUDIO SIGNAL ENCODER, AUDIO SIGNAL DECODER, METHOD FOR ENCODING OR DECODING AN AUDIO SIGNAL USING AN ALIASING-CANCELLATION 有权
标题翻译：音频信号编码器，音频信号解码器，使用消息取消来编码或解码音频信号的方法
公开(公告)号：US20120271644A1
公开(公告)日：2012-10-25
申请号：US13449949
申请日：2012-04-18
申请人： Bruno Bessette , Max Neuendorf , Ralf Geiger , Philippe Gournay , Roch Lefebvre , Bernhard Grill , Jeremie Lecomte , Stefan Bayer , Nikolaus Rettelbach , Lars Villemoes , Redwan Salami , Albertus C. Den Brinker
发明人： Bruno Bessette , Max Neuendorf , Ralf Geiger , Philippe Gournay , Roch Lefebvre , Bernhard Grill , Jeremie Lecomte , Stefan Bayer , Nikolaus Rettelbach , Lars Villemoes , Redwan Salami , Albertus C. Den Brinker
IPC分类号： G10L19/12
CPC分类号： G10L19/03 , G10L19/0212 , G10L19/20 , G10L2019/0008
摘要： An audio signal decoder includes a transform domain path configured to obtain a time-domain representation of a portion of an audio content on the basis of a first set of spectral coefficients, a representation of an aliasing-cancellation stimulus signal and a plurality of linear-prediction-domain parameters. The transform domain path applies a spectrum shaping to the first set of spectral coefficients to obtain a spectrally-shaped version thereof. The transform domain path obtains a time-domain representation of the audio content on the basis of the spectrally-shaped version of the first set of spectral coefficients. The transform domain path includes an aliasing-cancellation stimulus filter to filter the aliasing-cancellation stimulus signal in dependence on at least a subset of the linear-prediction-domain parameters. The transform domain path also includes a combiner configured to combine the time-domain representation of the audio content with an aliasing-cancellation synthesis signal to obtain an aliasing reduced time-domain signal.
摘要翻译：音频信号解码器包括变换域路径，被配置为基于第一组频谱系数获得音频内容的一部分的时域表示，混叠取消激励信号的表示和多个线性 - 预测域参数。变换域路径将频谱整形应用于第一组频谱系数，以获得其频谱形状的版本。变换域路径基于第一组频谱系数的频谱形式获得音频内容的时域表示。变换域路径包括混叠消除刺激滤波器，以根据线性预测域参数的至少一个子集来滤除混叠消除激励信号。变换域路径还包括组合器，其被配置为将音频内容的时域表示与混叠消除合成信号组合以获得混叠减小的时域信号。

78. 发明授权

US08175280B2 Generation of spatial downmixes from parametric representations of multi channel signals 有权
标题翻译：从多通道信号的参数化表示生成空间缩混
公开(公告)号：US08175280B2
公开(公告)日：2012-05-08
申请号：US11469799
申请日：2006-09-01
申请人： Lars Villemoes , Kristofer Kjoerling , Jeroen Breebaart
发明人： Lars Villemoes , Kristofer Kjoerling , Jeroen Breebaart
IPC分类号： H04R5/00
CPC分类号： H04S3/004 , H04S3/002 , H04S3/008 , H04S2400/01 , H04S2420/01
摘要： A headphone down mix signal can be efficiently derived from a parametric down mix of a multi-channel signal, when modified HRTFs (head related transfer functions) are derived from HRTFs of a multi-channel signal using a level parameter having information on a level relation between two channels of the multi-channel signals such that a modified HRTF is stronger influenced by the HRTF of a channel having a higher level than by the HRTF of a channel having a lower level. Modified HRTFs are derived within the decoding process taking into account the relative strength of the channels associated to the HRTFs. The HRTFs are thus modified such that a down mix signal of a parametric representation of a multi-channel signal can directly be used to synthesize the headphone down mix signal without the need of an intermediate full parametric multi-channel reconstruction of the parametric down mix.
摘要翻译：当使用具有关于电平关系的信息的电平参数从多信道信号的HRTF导出修改的HRTF（头部相关传输函数）时，可以从多信道信号的参数下调混合中有效地导出耳机下混合信号。在多信道信号的两个信道之间，使得修改的HRTF受到具有比具有较低电平的信道的HRTF高的信道的信道的HRTF更强的影响。考虑到与HRTF相关联的信道的相对强度，在解码过程中导出修改的HRTF。因此，HRTF被修改为使得多信道信号的参数表示的下混合信号可以直接用于合成耳机下混合信号，而不需要参数下调混合的中间全参数多通道重建。

79. 发明申请

US20120065983A1 Efficient Combined Harmonic Transposition 有权
标题翻译：有效的组合谐波转置
公开(公告)号：US20120065983A1
公开(公告)日：2012-03-15
申请号：US13321910
申请日：2010-05-25
申请人： Per Ekstrand , Lars Villemoes , Per Hedelin
发明人： Per Ekstrand , Lars Villemoes , Per Hedelin
IPC分类号： G10L19/00
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 Δf, 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 FΔf; with F being a resolution factor, with F≧1; wherein the transposition order P is different from the resolution factor F.
摘要翻译：本文件涉及利用用于高频重构（HFR）的谐波转置方法的音频编码系统以及数字效果处理器，例如，所谓的兴奋剂，其中谐波失真的产生增加处理信号的亮度。尤其是; 描述了一种被配置为从信号的低频分量产生信号的高频分量的系统。该系统可以包括分析滤波器组（501），其被配置为提供来自所述信号的低频分量的一组分析子带信号信号; 其中所述一组分析子带信号包括至少两个分析子带信号; 其中所述分析滤波器组具有频率分辨率＆Dgr; f，所述系统还包括非线性处理单元（502），其被配置为使用转置顺序P从所述一组分析子带信号中确定一组合成子带信号; 其中所述合成子带信号集合包括所述一组分析子带信号的一部分，所述分析子带信号的相位偏移量是从所述置换顺序P导出的量; 以及合成滤波器组（504），被配置为从所述合成子带信号的集合生成所述信号的高频分量; 其中所述合成滤波器组（504）具有F＆Dgr; f的频率分辨率; F为分辨率因子，F≥1; 其中转置次数P与分辨率因子F不同

80. 发明授权

US07983424B2 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：US07983424B2
公开(公告)日：2011-07-19
申请号：US11402519
申请日：2006-04-12
申请人： Kristofer Kjörling , Jürgen Herre , Sascha Disch , Lars Villemoes
发明人： Kristofer Kjörling , Jürgen Herre , Sascha Disch , Lars Villemoes
IPC分类号： H04R5/00 , G10L19/00
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。

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