Model Based Prediction in a Critically Sampled Filterbank

    公开(公告)号:US20230306974A1

    公开(公告)日:2023-09-28

    申请号:US18128494

    申请日:2023-03-30

    发明人: Lars Villemoes

    摘要: The present document relates to audio source coding systems. In particular, the present document relates to audio source coding systems which make use of linear prediction in combination with a filterbank. A method for estimating a first sample (615) of a first subband signal in a first subband of an audio signal is described. The first subband signal of the audio signal is determined using an analysis filterbank (612) comprising a plurality of analysis filters which provide a plurality of subband signals in a plurality of subbands from the audio signal, respectively. The method comprises determining a model parameter (613) of a signal model; determining a prediction coefficient to be applied to a previous sample (614) of a first decoded subband signals derived from the first subband signal, based on the signal model, based on the model parameter (613) and based on the analysis filterbank (612); wherein a time slot of the previous sample (614) is prior to a time slot of the first sample (615); and determining an estimate of the first sample (615) by applying the prediction coefficient to the previous sample (614).

    High resolution audio coding
    16.
    发明授权

    公开(公告)号:US11715478B2

    公开(公告)日:2023-08-01

    申请号:US17372951

    申请日:2021-07-12

    发明人: Yang Gao

    IPC分类号: G10L19/06 G10L19/032

    CPC分类号: G10L19/06 G10L19/032

    摘要: Methods, systems, apparatuses, and computer programs encoded on computer storage media for performing linear predictive coding (LPC) are described. At least one of a differential spectrum tilt and an energy difference between a current frame and a previous frame of the audio signal is determined. A spectral stability of the audio signal is detected based on at least one of the differential spectrum tilt and an energy difference between the current frame and the previous frame of the audio signal. In response to detecting the spectral stability of the audio signal, quantized LPC parameters for the previous frame are copied into the current frame of the audio signal.

    CODING METHOD, DEVICE, PROGRAM, AND RECORDING MEDIUM

    公开(公告)号:US20190206414A1

    公开(公告)日:2019-07-04

    申请号:US16295039

    申请日:2019-03-07

    IPC分类号: G10L19/22 G10L19/20 H03M7/30

    摘要: A coding technology that efficiently codes an input sound signal irrespective of the characteristics thereof and can obtain a decoded sound signal that sounds less artificial to a listener. A coding method codes an input sound signal frame by frame of a predetermined time segment by a selected coding processing from a plurality of types of coding processing in the frequency domain, the coding method makes it possible for a selection unit to select coding processing which is different from the coding processing of the preceding frame as coding processing of the present frame if at least one of the magnitude of the energy of high frequency components of the input sound signal of the preceding frame and the magnitude of the energy of high frequency components of the input sound signal of the present frame is smaller than or equal to a predetermined threshold value.