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    PARAMETER ENCODING AND DECODING
    8.
    发明公开
    PARAMETER ENCODING AND DECODING 审中-实审

    公开(公告)号：EP4398243A2

    公开(公告)日：2024-07-10

    申请号：EP24166906.8

    申请日：2020-06-15

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

    发明人： BOUTHÉON, Alexandre ,  FUCHS, Guillaume ,  MULTRUS, Markus ,  KÜCH, Fabian ,  THIERGART, Oliver ,  BAYER, Stefan ,  DISCH, Sascha ,  HERRE, Jürgen

    IPC分类号： G10L19/008

    CPC分类号： G10L19/008

    摘要： There is disclosed audio synthesizer (300) for generating a synthesis signal (336) from a downmix signal (324, x) having a number of downmix channels, the synthesis signal (336) having a number of synthesis channels, the downmix signal (324, x) being a downmixed version of an original signal (212) having a number of original channels, the audio synthesizer (300) comprising:
    a first path (610c') including:
    a first mixing matrix block (600c) configured for synthesizing a first component (336M') of the synthesis signal according to a first mixing matrix (MM) calculated from:
    a covariance matrix (CYR) associated to the synthesis signal (212); and
    a covariance matrix (Cx) associated to the downmix signal (324),

    a second path (610c) for synthesizing a second component (336R') of the synthesis signal, wherein the second component (336R') is a residual component, the second path (610c) including:
    a prototype signal block (612c) configured for upmixing the downmix signal (324) from the number of downmix channels to the number of synthesis channels;
    a decorrelator (614c) configured for decorrelating the upmixed prototype signal (613c);
    a second mixing matrix block (618c) configured for synthesizing the second component (336R') of the synthesis signal according to a second mixing matrix (MR) from the decorrelated version (615c) of the downmix signal (324), the second mixing matrix (MR) being a residual mixing matrix,

    wherein the audio synthesizer (300) is configured to calculate (618c) the second mixing matrix (MR) from:
    the residual covariance matrix (Cr) provided by the first mixing matrix block(600c); and
    an estimate of the covariance matrix of the decorrelated prototype signals (Cy ) obtained from the covariance matrix (Cx) associated to the downmix signal (324),

    wherein the audio synthesizer (300) further comprises an adder block (620c) for summing the first component (336M') of the synthesis signal with the second component (336R') of the synthesis signal.

    AUDIO BANDWIDTH EXTENSION DECODER, CORRESPONDING METHOD AND COMPUTER PROGRAM
    10.
    发明公开
    AUDIO BANDWIDTH EXTENSION DECODER, CORRESPONDING METHOD AND COMPUTER PROGRAM 审中-公开

    公开(公告)号：EP4224475A1

    公开(公告)日：2023-08-09

    申请号：EP23180374.3

    申请日：2009-12-11

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

    发明人： NAGEL, Frederik ,  FUCHS, Guillaume ,  DISCH, Sascha ,  HERRE, Jürgen ,  GRIEBEL, Christian

    IPC分类号： G10L21/038 ,  G10L19/24

    摘要： A bandwidth extension decoder (500), (600) for providing a bandwidth extended audio signal (532) based on an input audio signal (502) and a parameter signal (504), wherein the parameter signal (504) comprises an indication of an offset frequency and an indication of a power density parameter, comprises: a patch generator (510) configured to generate a bandwidth extension high-frequency signal (512) comprising a high-frequency band, wherein the high-frequency band of the bandwidth extension high-frequency signal (512) is generated based on a frequency shift of a frequency band of the input audio signal (502), wherein the frequency shift is based on the offset frequency, and wherein the patch generator (510) is configured to amplify or attenuate the high-frequency band of the bandwidth extension high-frequency signal (512) by a factor equal to the value of the power density parameter or equal to the reciprocal value of the power density parameter, respectively; a combiner (529) configured to combine the bandwidth extension high-frequency signal (512) and the input audio signal (502) to obtain the bandwidth extended audio signal (532); and an output interface (530) configured to provide the bandwidth extended audio signal (532) .