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    METHOD AND APPARATUS FOR PROCESSING AN AUDIO SIGNAL, AUDIO DECODER AND AUDIO ENCODER
    8.
    发明公开
    METHOD AND APPARATUS FOR PROCESSING AN AUDIO SIGNAL, AUDIO DECODER AND AUDIO ENCODER 审中-公开

    公开(公告)号：EP4235667A3

    公开(公告)日：2023-09-13

    申请号：EP23179786.1

    申请日：2015-07-03

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

    发明人： RAVELLI, Emmanuel ,  JANDER, Manuel ,  PIETRZYK, Grzegorz ,  DIETZ, Martin ,  GAYER, Marc

    IPC分类号： G10L19/26 ,  G10L19/06 ,  G11B27/038 ,  G10L21/0364

    摘要： A method for processing an audio signal (100) includes processing audio frames of the audio signal at an audio decoder by filtering the frames using an audio codec postfilter for reducing a level of coding noise between signal harmonics; and using linear predictive filtering for removing (S102, S104, S300-S308, S400-S402) a discontinuity (106a, 106b) between a filtered past frame and a filtered current frame of the audio signal. The method includes filtering the current frame of the audio signal and removing the discontinuity by modifying a beginning portion of the filtered current frame by a signal obtained by linear predictive filtering a predefined signal with initial states of the linear predictive filter defined on the basis of a last part of the unfiltered past frame filtered using the set of filter parameters for filtering the current frame. The audio codec postfilter is defined as follows: H z = 1 − B z / 1 − A z ⋅ z − ⊤ where B(z) and A(z) are two FIR filters, the H(z) filter parameters are the coefficients of the FIR filters B(z) and A(z), and T indicates the pitch lag.