专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

81. 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。

82. 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。

83. 发明申请

US20060053018A1 Advanced processing based on a complex-exponential-modulated filterbank and adaptive time signalling methods 有权
公开(公告)号：US20060053018A1
公开(公告)日：2006-03-09
申请号：US11260659
申请日：2005-10-26
申请人： Jonas Engdegard , Lars Villemoes
发明人： Jonas Engdegard , Lars Villemoes
IPC分类号： G10L19/00
CPC分类号： G10L19/008 , G10L19/0204 , H03H17/0266 , H04S5/00 , H04S2420/03
摘要： A synthesizer for generating a decorrelation signal using an input signal is operative on a plurality of subband signals, wherein a subband signal includes a sequence of at least two subband samples, the sequence of the subband samples representing a bandwidth of the subband signal, which is smaller than a bandwidth of the input signal. The synthesizer includes a filter stage for filtering each subband signal using a reverberation filter to obtain a plurality of reverberated subband signals, wherein a plurality of reverberated subband signals together represent the decorrelation signal. This decorrelation signal is used for reconstructing a signal based on a parametrically encoded stereo signal consisting of a mono signal and a coherence measure.

84. 发明授权

US09224403B2 Selective bass post filter 有权
标题翻译：选择性低音后置滤镜
公开(公告)号：US09224403B2
公开(公告)日：2015-12-29
申请号：US13703875
申请日：2011-06-23
申请人： Barbara Resch , Kristofer Kjörling , Lars Villemoes
发明人： Barbara Resch , Kristofer Kjörling , Lars Villemoes
IPC分类号： G10L19/00 , G10L19/26 , G10L19/12 , G10L19/125 , G10L19/02 , G10L19/107 , G10L19/20
CPC分类号： G10L19/26 , G10L19/02 , G10L19/0212 , G10L19/032 , G10L19/09 , G10L19/107 , G10L19/12 , G10L19/125 , G10L19/20 , G10L19/22 , G10L19/265 , G10L21/003 , G10L21/007 , G10L21/013
摘要： In one aspect, the invention provides an audio encoding method characterized by a decision being made as to whether the device which will decode the resulting bit stream should apply post filtering including attenuation of interharmonic noise. Hence, the decision whether to use the post filter, which is encoded in the bit stream, is taken separately from the decision as to the most suitable coding mode. In another aspect, there is provided an audio decoding method with a decoding step followed by a post-filtering step, including interharmonic noise attenuation, and being characterized in a step of disabling the post filter in accordance with post filtering information encoded in the bit stream signal. Such a method is well suited for mixed-origin audio signals by virtue of its capability to deactivate the post filter in dependence of the post filtering information only, hence independently of factors such as the current coding mode.
摘要翻译：在一个方面，本发明提供了一种音频编码方法，其特征在于作出关于将对所得比特流进行解码的装置是否应该应用包括衰减间谐波噪声的后置滤波的决定。因此，决定是否使用在比特流中编码的后置滤波器，与最适合的编码模式的决定分开。在另一方面，提供了一种具有解码步骤之后是后置滤波步骤的音频解码方法，包括间谐波噪声衰减，并且其特征在于根据在比特流中编码的后置滤波信息来禁用后置滤波器信号。这种方法凭借其根据后置滤波信息去激活后置滤波器的能力，因此独立于诸如当前编码模式的因素，非常适用于混合源音频信号。

85. 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。

86. 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。

87. 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。

88. 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。

89. 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。

90. 发明申请

US20110054914A1 Method for Reduction of Aliasing Introduced by Spectral Envelope Adjustment in Real-Valued Filterbanks 有权
标题翻译：减少实数滤波器中频谱信号调整引入的混叠的方法
公开(公告)号：US20110054914A1
公开(公告)日：2011-03-03
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.
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。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式