公开(公告)号：US09159326B2

公开(公告)日：2015-10-13

申请号：US13638900

申请日：2011-04-06

申请人： Heiko Purnhagen ,  Pontus Carlsson ,  Lars Villemoes

发明人： Heiko Purnhagen ,  Pontus Carlsson ,  Lars Villemoes

IPC分类号： H04R5/00 ,  G10L19/008

CPC分类号： G10L19/008 ,  G10L19/0212 ,  G10L19/06 ,  G10L19/167 ,  G10L25/12 ,  H04S3/008 ,  H04S2400/01

摘要： The invention provides methods and devices for stereo encoding and decoding using complex prediction in the frequency domain. In one embodiment, a decoding method, for obtaining an output stereo signal from an input stereo signal encoded by complex prediction coding and comprising first frequency-domain representations of two input channels, comprises the upmixing steps of: (i) computing a second frequency-domain representation of a first input channel; and (ii) computing an output channel on the basis of the first and second frequency-domain representations of the first input channel, the first frequency domain representation of the second input channel and a complex prediction coefficient. The method comprises performing frequency-domain modifications selectively before or after upmixing.

摘要翻译： 本发明提供使用频域中的复数预测的立体声编码和解码的方法和装置。 在一个实施例中，一种用于从由复数预测编码编码的输入立体声信号中获得输出立体声信号并包括两个输入声道的第一频域表示的解码方法包括上混合步骤：（i）计算第二频率 - 第一输入通道的域表示; 以及（ii）基于第一输入通道的第一和第二频域表示，第二输入通道的第一频域表示和复数预测系数来计算输出通道。 该方法包括在混合之前或之后选择性地执行频域修改。

公开(公告)号：US09129597B2

公开(公告)日：2015-09-08

申请号：US13604869

申请日：2012-09-06

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： G10L19/00 ,  G10L19/022 ,  G10L19/02 ,  G10L25/90

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。

公开(公告)号：US08886346B2

公开(公告)日：2014-11-11

申请号：US13499893

申请日：2010-05-25

申请人： Lars Villemoes ,  Per Ekstrand

发明人： Lars Villemoes ,  Per Ekstrand

IPC分类号： G06F17/00 ,  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 Δf; and an analysis window (611) having a duration of DA; 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 QΔf; and a synthesis window (612) having a duration of Ds; 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 Δf and the duration DA 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转移器的高频重构方法。 描述了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＆Dgr; f的分析变换单元（601） 和具有DA持续时间的分析窗口（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来确定一组合成子带信号，其中所述一组分析子带信号的所述部分被相移一个换位阶数T; f）具有频率分辨率为Q＆Dgr; f的合成变换单元（602）的合成滤波器组（504） 和具有持续时间Ds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是具有Q≥1且小于置换次数T的频率分辨率因子; 并且其中基于频率分辨率因子Q选择频率分辨率＆Dgr; f的乘积值和分析滤波器组的持续时间DA。

公开(公告)号：US08515083B2

公开(公告)日：2013-08-20

申请号：US11290370

申请日：2005-11-29

申请人： Lars Villemoes ,  Kristofer Kjoerling ,  Heiko Purnhagen ,  Jonas Roeden ,  Jeroen Breebaart ,  Gerard Hotho

发明人： Lars Villemoes ,  Kristofer Kjoerling ,  Heiko Purnhagen ,  Jonas Roeden ,  Jeroen Breebaart ,  Gerard Hotho

IPC分类号： H04R5/00 ,  G06F17/00 ,  G10L19/00

CPC分类号： G10L19/008 ,  G10L19/04 ,  H04S2420/03

摘要： For a multi-channel reconstruction of audio signals based on at least one base channel, an energy measure is used for compensating energy losses due to an predictive upmix. The energy measure can be applied in the encoder or the decoder. Furthermore, a decorrelated signal is added to output channels generated by an energy-loss introducing upmix procedure. The energy of the decorrelated signal is smaller than or equal to an energy error introduced by the predictive upmix. Thus, problems occurring for prediction based up-mix methods such as up-mixing signals that are coded with High Frequency Reconstruction techniques are solved, so that the correct correlation between the up-mixed channels is obtained or the up-mix is adapted to arbitrary down-mixes.

摘要翻译： 对于基于至少一个基本信道的音频信号的多声道重建，能量测量被用于由于预测上混补偿能量损失。 能量测量可以应用于编码器或解码器。 此外，将去相关信号添加到通过能量损失引入上混程序产生的输出通道。 解相关信号的能量小于或等于由预测上混引入的能量误差。 因此，解决了用于基于预测的上混合方法（例如用高频重建技术编码的上混合信号）所出现的问题，从而获得上混合信道之间的正确相关性，或者将混合信号适配为任意的 下混

公开(公告)号：US08443026B2

公开(公告)日：2013-05-14

申请号：US12687801

申请日：2010-01-14

申请人： Per Ekstrand ,  Lars Villemoes ,  Heiko Purnhagen

发明人： Per Ekstrand ,  Lars Villemoes ,  Heiko Purnhagen

IPC分类号： G06F17/10

CPC分类号： G10L19/008 ,  G10L19/0208

摘要： An apparatus for processing a plurality of real-valued subband signals using a first real-valued subband signal and a second real-valued subband signal to provide at least a complex-valued subband signal comprises 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： 一种用于使用第一实值子带信号和第二实值子带信号来处理多个实值子带信号以提供至少复值子带信号的装置包括多频带滤波器，用于提供中间实值子带 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。

公开(公告)号：US08433583B2

公开(公告)日：2013-04-30

申请号：US12294255

申请日：2007-03-23

申请人： Lars Villemoes ,  Erik Schuijers

发明人： Lars Villemoes ,  Erik Schuijers

IPC分类号： G10L19/00

CPC分类号： H04S3/008 ,  G10L19/008 ,  G10L19/0208 ,  G10L25/18

摘要： An audio decoder comprises a receiver (801) for receiving input data comprising an N-channel signal corresponding to a down-mixed signal of an M-channel audio signal, M>N, having complex valued subband encoding matrices applied in frequency subbands and parametric multi-channel data. A subband filter bank (805) generates real-valued frequency subbands for the N-channel signal. A matrix processor (809) determines real-valued subband decoding matrices for compensating the application of the encoding matrices in response to the parametric multi-channel data. A compensation processor (807) generates down-mix data corresponding to the down-mixed signal by a matrix multiplication of the real-valued subband decoding matrices and data of the N-channel signal in the at least some real-valued frequency subbands. The down-mix data can be used to regenerate the down-mixed signal and the M-channel audio signal. The decoder may compensate for MPEG Matrix Surround Compatibility operations performed at the encoder using real-valued frequency subbands.

摘要翻译： 音频解码器包括接收器（801），用于接收输入数据，该输入数据包括对应于M频道音频信号M> N的下混合信号的N信道信号，M信道具有在频率子带中应用的复值子带编码矩阵，并且参数 多通道数据。 子带滤波器组（805）产生用于N沟道信号的实数频率子带。 矩阵处理器（809）响应于参数多通道数据确定用于补偿编码矩阵的应用的实值子带解码矩阵。 补偿处理器（807）通过实数子带解码矩阵的矩阵乘法和至少一些实数频率子带中的N信道信号的数据来生成与下混合信号相对应的下混数据。 下混合数据可用于再生下混合信号和M声道音频信号。 解码器可以补偿在编码器处使用实数频率子带执行的MPEG矩阵环绕兼容性操作。

公开(公告)号：US20130090933A1

公开(公告)日：2013-04-11

申请号：US13604364

申请日：2012-09-05

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： G10L19/008

CPC分类号： G10L19/008 ,  G10L19/0204 ,  G10L21/038 ,  G10L21/04

摘要： An apparatus for processing an input audio signal relies on a cascade of filterbanks, the cascade having a synthesis filterbank for synthesizing an audio intermediate signal from the input audio signal, the input audio signal being represented by a plurality of first subband signals generated by an analysis filterbank, wherein a number of filterbank channels of the synthesis filterbank is smaller than a number of channels of the analysis filterbank. The apparatus furthermore has a further analysis filterbank for generating a plurality of second subband signals from the audio intermediate signal, wherein the further analysis filterbank has a number of channels being different from the number of channels of the synthesis filterbank, so that a sampling rate of a subband signal of the plurality of second subband signals is different from a sampling rate of a first subband signal of the plurality of first subband signals.

摘要翻译： 用于处理输入音频信号的装置依赖于级联的滤波器组，该级联具有用于从输入音频信号合成音频中间信号的合成滤波器组，输入音频信号由分析产生的多个第一子带信号表示 滤波器组，其中合成滤波器组的多个滤波器组信道小于分析滤波器组的信道数。 该装置还具有用于从音频中间信号产生多个第二子带信号的进一步的分析滤波器组，其中进一步的分析滤波器组具有与合成滤波器组的信道数不同的信道数，使得采样率 多个第二子带信号的子带信号与多个第一子带信号的第一子带信号的采样率不同。

公开(公告)号：US20130028426A1

公开(公告)日：2013-01-31

申请号：US13638898

申请日：2011-04-06

申请人： Heiko Purnhagen ,  Pontus Carlsson ,  Lars Villemoes

发明人： Heiko Purnhagen ,  Pontus Carlsson ,  Lars Villemoes

IPC分类号： H04R5/00

CPC分类号： G10L19/008 ,  G10L19/0212 ,  G10L19/06 ,  G10L19/167 ,  G10L25/12 ,  H04S3/008 ,  H04S2400/01

摘要： The invention provides methods and devices for stereo encoding and decoding using complex prediction in the frequency domain. In one embodiment, a decoding method, for obtaining an output stereo signal from an input stereo signal encoded by complex prediction coding and comprising first frequency-domain representations of two input channels, comprises the upmixing steps of: (i) computing a second frequency-domain representation of a first input channel; and (ii) computing an output channel on the basis of the first and second frequency-domain representations of the first input channel, the first frequency-domain representation of the second input channel and a complex prediction coefficient. The upmixing can be suspended responsive to control data.

摘要翻译： 本发明提供使用频域中的复数预测的立体声编码和解码的方法和装置。 在一个实施例中，一种用于从由复数预测编码编码的输入立体声信号中获得输出立体声信号并包括两个输入声道的第一频域表示的解码方法包括上混合步骤：（i）计算第二频率 - 第一输入通道的域表示; 以及（ii）基于第一输入通道的第一和第二频域表示，第二输入通道的第一频域表示和复数预测系数来计算输出通道。 响应于控制数据可以暂停上混。

公开(公告)号：US08285771B2

公开(公告)日：2012-10-09

申请号：US12716777

申请日：2010-03-03

申请人： Per Ekstrand ,  Lars Villemoes ,  Heiko Purnhagen

发明人： Per Ekstrand ,  Lars Villemoes ,  Heiko Purnhagen

IPC分类号： G06F17/10

CPC分类号： G10L19/008 ,  G10L19/0208

摘要： An apparatus for processing a plurality of real-valued subband signals using a first real-valued subband signal and a second real-valued subband signal to provide at least a complex-valued subband signal comprises 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.

公开(公告)号：US08180818B2

公开(公告)日：2012-05-15

申请号：US12716739

申请日：2010-03-03

申请人： Per Ekstrand ,  Lars Villemoes ,  Heiko Purnhagen

发明人： Per Ekstrand ,  Lars Villemoes ,  Heiko Purnhagen

IPC分类号： G06F17/10

CPC分类号： G10L19/0208

摘要： An apparatus for processing a plurality of real-valued subband signals using a first real-valued subband signal and a second real-valued subband signal to provide at least a complex-valued subband signal comprises 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： 一种用于使用第一实值子带信号和第二实值子带信号来处理多个实值子带信号以提供至少复值子带信号的装置包括多频带滤波器，用于提供中间实值子带 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。