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    PARTITIONED BLOCK FREQUENCY DOMAIN ADAPTIVE FILTER DEVICE COMPRISING ADAPTATION MODULES AND CORRECTION MODULES
    1.
    发明公开
    PARTITIONED BLOCK FREQUENCY DOMAIN ADAPTIVE FILTER DEVICE COMPRISING ADAPTATION MODULES AND CORRECTION MODULES 审中-公开

    公开(公告)号：EP3329594A1

    公开(公告)日：2018-06-06

    申请号：EP16745677.1

    申请日：2016-07-25

    申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.

    发明人： LUIS VALERO, Maria ,  HABETS, Emanuel ,  MABANDE, Edwin ,  LOMBARD, Anthony ,  MAHNE, Dirk ,  BIRZER, Bernhard

    IPC分类号： H03H21/00

    CPC分类号： H03H21/0067 ,  H03H21/0027 ,  H03H21/0043 ,  H03H2021/0058

    摘要： Partitioned block frequency domain adaptive filter device comprising: a frequency domain adaptive filter configured for filtering a frequency domain representation of a time domain input signal depending on a set of filter coefficients consisting of a plurality of blocks of filter coefficients in order to produce a filtered signal; a plurality of parallel arranged filter update blocks, each of the filter update blocks being configured for updating one of the blocks of filter coefficients based on an update signal gathered by a circular correlation of a block of the frequency domain representation signal and a frequency domain control signal comprising a representation of the filtered signal; wherein each of the filter update blocks comprises an adaptation module configured for executing an adaptation sequence comprising the steps of calculating an approximation of a constrained gradient update for the filter coefficients of the respective block of filter coefficients by applying an approximated constraining matrix having a lesser complexity than a constraining matrix to an unconstrained gradient update for the filter coefficients of the respective block of filter coefficients, wherein the unconstrained gradient update is derived from the update signal, and calculating a cumulative error introduced on the unconstrained gradient update by applying the approximated constraining matrix to the unconstrained gradient update; wherein each of the filter update blocks comprises a correction module configured for executing a correction sequence comprising the steps of calculating a corrected constrained gradient update for the filter coefficients of the respective block of filter coefficients by applying the frequency domain constraining matrix to a sum of the approximation of the constrained gradient update and the cumulative error.

    NOISE FILLING IN MULTICHANNEL AUDIO CODING
    6.
    发明公开
    NOISE FILLING IN MULTICHANNEL AUDIO CODING 有权
    RAUSCHFÜLLUNGBEI MEHRKANALIGER AUDIOCODIERUNG

    公开(公告)号：EP3025341A1

    公开(公告)日：2016-06-01

    申请号：EP14744026.7

    申请日：2014-07-18

    申请人： Fraunhofer Gesellschaft zur Förderung der angewandten Forschung E.V.

    发明人： LUIS VALERO, Maria ,  HELMRICH, Christian ,  HILPERT, Johannes

    IPC分类号： G10L19/028 ,  G10L19/032

    CPC分类号： G10L19/028 ,  G10L19/008 ,  G10L19/035 ,  H04S3/008 ,  H04S2400/01 ,  H04S2400/03 ,  H04S2420/03

    摘要： In multichannel audio coding, an improved coding efficiency is achieved by the following measure: the noise filling of zero-quantized scale factor bands is performed using noise filling sources other than artificially generated noise or spectral replica. In particular, the coding efficiency in multichannel audio coding may be rendered more efficient by performing the noise filling based on noise generated using spectral lines from a previous frame of, or a different channel of the current frame of, the multichannel audio signal.

    摘要翻译： 在多声道音频编码中，通过以下措施来实现改进的编码效率：使用除人为产生的噪声或频谱复制品之外的噪声填充源来执行零量化比例因子频带的噪声填充。 特别地，通过基于使用来自多声道音频信号的当前帧的先前帧或不同频道的频谱线产生的噪声执行噪声填充，可以使多声道音频编码中的编码效率更高效。