利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

235 条记录 (耗时 0.038 秒)

    PARAMETER ENCODING AND DECODING
    4.
    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
    6.
    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) .

    APPARATUS AND METHOD FOR MDCT M/S STEREO WITH GLOBAL ILD WITH IMPROVED MID/SIDE DECISION
    7.
    发明公开
    APPARATUS AND METHOD FOR MDCT M/S STEREO WITH GLOBAL ILD WITH IMPROVED MID/SIDE DECISION 审中-公开

    公开(公告)号：EP4123645A1

    公开(公告)日：2023-01-25

    申请号：EP22191567.1

    申请日：2017-01-20

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

    发明人： RAVELLI, Emmanuel ,  SCHNELL, Markus ,  DÖHLA, Stefan ,  JAEGERS, Wolfgang ,  DIETZ, Martin ,  HELMRICH, Christian ,  MARKOVIC, Goran ,  FOTOPOULOU, Eleni ,  MULTRUS, Markus ,  BAYER, Stefan ,  FUCHS, Guillaume ,  HERRE, Jürgen

    IPC分类号： G10L19/008 ,  G10L19/22 ,  G10L19/02

    摘要： Fig. 1 illustrates an apparatus for encoding a first channel and a second channel of an audio input signal comprising two or more channels to obtain an encoded audio signal according to an embodiment. The apparatus comprises a normalizer (110) configured to determine a normalization value for the audio input signal depending on the first channel of the audio input signal and depending on the second channel of the audio input signal, wherein the normalizer (110) is configured to determine a first channel and a second channel of a normalized audio signal by modifying, depending on the normalization value, at least one of the first channel and the second channel of the audio input signal. Moreover, the apparatus comprises an encoding unit (120) being configured to generate a processed audio signal having a first channel and a second channel, such that one or more spectral bands of the first channel of the processed audio signal are one or more spectral bands of the first channel of the normalized audio signal, such that one or more spectral bands of the second channel of the processed audio signal are one or more spectral bands of the second channel of the normalized audio signal, such that at least one spectral band of the first channel of the processed audio signal is a spectral band of a mid signal depending on a spectral band of the first channel of the normalized audio signal and depending on a spectral band of the second channel of the normalized audio signal, and such that at least one spectral band of the second channel of the processed audio signal is a spectral band of a side signal depending on a spectral band of the first channel of the normalized audio signal and depending on a spectral band of the second channel of the normalized audio signal. The encoding unit (120) is configured to encode the processed audio signal to obtain the encoded audio signal.

    APPARATUS AND METHOD FOR SOURCE SEPARATION USING AN ESTIMATION AND CONTROL OF SOUND QUALITY
    9.
    发明公开
    APPARATUS AND METHOD FOR SOURCE SEPARATION USING AN ESTIMATION AND CONTROL OF SOUND QUALITY 审中-公开

    公开(公告)号：EP3671739A1

    公开(公告)日：2020-06-24

    申请号：EP18215707.3

    申请日：2018-12-21

    申请人： FRAUNHOFER-GESELLSCHAFT zur Förderung der angewandten Forschung e.V. ,  Friedrich-Alexander-Universität Erlangen-Nürnberg

    发明人： UHLE, Christian ,  TORCOLI, Matteo ,  DISCH, Sascha ,  PAULUS, Jouni ,  HERRE, Jürgen ,  HELLMUTH, Oliver ,  FUCHS, Harald

    IPC分类号： G10L21/0308 ,  G10L25/30 ,  G10L25/60

    摘要： An apparatus for generating a separated audio signal from an audio input signal is provided. The audio input signal comprises a target audio signal portion and a residual audio signal portion. The residual audio signal portion indicates a residual between the audio input signal and the target audio signal portion. The apparatus comprises a source separator (110), a determining module (120) and a signal processor (130). The source separator (110) is configured to determine an estimated target signal which depends on the audio input signal, the estimated target signal being an estimate of a signal that only comprises the target audio signal portion. The determining module (120) is configured to determine one or more result values depending on an estimated sound quality of the estimated target signal to obtain one or more parameter values, wherein the one or more parameter values are the one or more result values or depend on the one or more result values. The signal processor (130) is configured to generate the separated audio signal depending on the one or more parameter values and depending on at least one of the estimated target signal and the audio input signal and an estimated residual signal, the estimated residual signal being an estimate of a signal that only comprises the residual audio signal portion.