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    PARTITIONED BLOCK FREQUENCY DOMAIN ADAPTIVE FILTER DEVICE COMPRISING ADAPTATION MODULES AND CORRECTION MODULES
    7.
    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.

    APPARATUS, METHOD OR COMPUTER PROGRAM FOR GENERATING A SOUND FIELD DESCRIPTION
    8.
    发明公开
    APPARATUS, METHOD OR COMPUTER PROGRAM FOR GENERATING A SOUND FIELD DESCRIPTION 审中-公开

    公开(公告)号：EP3579577A1

    公开(公告)日：2019-12-11

    申请号：EP19187901.4

    申请日：2017-03-10

    申请人： FRAUNHOFER-GESELLSCHAFT zur Förderung der angewandten Forschung e.V.

    发明人： HABETS, Emanuel ,  THIERGART, Oliver ,  KÜCH, Fabian ,  NIEDERLEITNER, Alexander ,  KHAN, Affan-Hasan ,  MAHNE, Dirk

    IPC分类号： H04R3/00

    摘要： An apparatus for generating a sound field description having a representation of sound field components, comprises a direction determiner (102) for determining one or more sound directions for each time-frequency tile of a plurality of time-frequency tiles of a plurality of microphone signals; a spatial basis function evaluator (103) for evaluating, for each time-frequency tile of the plurality of time-frequency tiles, one or more spatial basis functions using the one or more sound directions; and a sound field component calculator (201) for calculating, for each time-frequency tile of the plurality of time-frequency tiles, one or more sound field components corresponding to the one or more spatial basis functions evaluated using the one or more sound directions and a reference signal for a corresponding time-frequency tile, the reference signal being derived from one or more microphone signals of the plurality of microphone signals.