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51.发明授权
公开(公告)号：EP2124485B1
公开(公告)日：2018-06-27
申请号：EP09009940.9
申请日：2004-04-30
发明人： Engdegard, Jonas , Villemoes, Lars
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 (201) 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.
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52.发明授权Binaural multi-channel decoder in the context of non-energy-conserving upmix rules 有权在的上混规则，而不节能上下文双耳多声道解码器
公开(公告)号：EP2216776B1
公开(公告)日：2014-11-12
申请号：EP10155535.7
申请日：2006-09-04
发明人： Villemoes, Lars
CPC分类号： H04S7/30 , G10L19/008 , H04S7/307 , H04S2400/01 , H04S2400/03 , H04S2420/01 , H04S2420/03
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53.发明公开Oversampling in a combined transposer filter bank 有权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
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。
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54.发明授权Enhanced coding and parameter representation of multichannel downmixed object coding 有权改进的编码和在多个对象编码下混合信道的参数表示
公开(公告)号：EP2372701B1
公开(公告)日：2013-12-11
申请号：EP11153938.3
申请日：2007-10-05
IPC分类号： H04S7/00 , G10L19/008
CPC分类号： G10L19/20 , G10L19/008 , H04S3/008 , H04S3/02 , H04S5/00 , H04S7/30 , H04S2400/03 , H04S2400/11 , H04S2420/03
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55.发明授权Method for reduction of aliasing introduced by spectral envelope adjustment in real-valued filterbanks 有权一种用于减小混叠干扰的方法，所造成的频谱包络的以实数值的滤波器组的调整
公开(公告)号：EP2239847B1
公开(公告)日：2013-10-09
申请号：EP10172087.8
申请日：2003-08-27
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改善实值滤波器组的基于频谱包络调整器的性能的新方法。 通过自适应地锁定为在应用程序定义的依赖于信道的符号相邻信道时，增益值，减小混叠的实现。 进一步，增益计算时的信道的分组，使在滤波器组的实值子带信号的改进的能量估计。
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56.发明公开
公开(公告)号：EP2620941A1
公开(公告)日：2013-07-31
申请号：EP13164569.9
申请日：2010-01-15
发明人： Villemoes, Lars , Hedelin, Per
IPC分类号： G10L21/0388
CPC分类号： G10L19/265 , G10L19/02 , G10L21/0388 , G10L25/90
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建（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，通过修改多个分析子带信号中的第一和第二分析子带信号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，它包括用于从合成子带信号产生信号的高频分量的合成滤波器组。
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公开(公告)号：EP2337223A3
公开(公告)日：2012-01-25
申请号：EP10194523.6
申请日：2006-09-01
发明人： Villemoes, Lars
IPC分类号： H03H17/02
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.
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58.发明公开
公开(公告)号：EP2265042A2
公开(公告)日：2010-12-22
申请号：EP10183592.4
申请日：2004-04-30
发明人： Engdegard, Jonas , Villemoes, Lars
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 (201) 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.
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59.发明公开
公开(公告)号：EP2265041A2
公开(公告)日：2010-12-22
申请号：EP10180688.3
申请日：2004-04-30
发明人： Engdegard, Jonas , Villemoes, Lars
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 (201) 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.
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60.发明公开Binaural multi-channel decoder in the context of non-energy-conserving upmix rules 有权Binauraler Mehrkanal-Decodierer im Kontext von Upmix-Regeln ohne Energieerhaltung
公开(公告)号：EP2216776A2
公开(公告)日：2010-08-11
申请号：EP10155535.7
申请日：2006-09-04
发明人： Villemoes, Lars
CPC分类号： H04S7/30 , G10L19/008 , H04S7/307 , H04S2400/01 , H04S2400/03 , H04S2420/01 , H04S2420/03
摘要： A multi-channel decoder for generating a binaural signal from a downmix signal using upmix rule information on an energy-error introducing upmix rule for calculating a gain factor (180) based on the upmix rule information and characteristics of head related transfer function based filters corresponding to upmix channels. The one or more gain factors are used by a filter processor (182) for filtering the downmix signal so that an energy corrected binaural signal having a left binaural channel and a right binaural channel is obtained.
摘要翻译： 一种多通道解码器，用于根据上混合规则信息和与头部相关的基于传递函数的滤波器对应的特征，使用关于能量误差引入上混合规则的上混合规则信息从下混合信号产生双耳信号，用于计算增益因子（180） 上混通道。 滤波器处理器（182）使用一个或多个增益因子来滤波下混合信号，从而获得具有左双耳通道和右双耳通道的能量校正双耳信号。
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