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19 条记录 (耗时 0.013 秒)

    METHOD AND APPARATUS FOR GENERATING AND ENCODING LINE SPECTRAL SQUARE ROOTS
    3.
    发明公开
    METHOD AND APPARATUS FOR GENERATING AND ENCODING LINE SPECTRAL SQUARE ROOTS 失效
    方法和装置产生和编码LINIENSPEKTRALWURZELN

    公开(公告)号：EP0842509A1

    公开(公告)日：1998-05-20

    申请号：EP96926869.0

    申请日：1996-08-01

    申请人： QUALCOMM INCORPORATED

    发明人： GARDNER, William, R. ,  MANJUNATH, Sharath ,  MONTA, Peter

    IPC分类号： G10L19 ,  H03M7 ,  H04B14

    CPC分类号： G10L19/07

    摘要： The present invention teaches of a method of encoding linear predictive coefficient data. The present invention transforms the linear predictive coefficient data into line spectral cosine data (103). The line spectral cosine data is used to generate two recursively defined vectors (104). The recursively defined vectors are used to compute a set of sensitivity autocorrelation values (106a-106N) and a set of sensitivity cross correlation (107a-107N). The line spectral cosine values are used to compute a set of line spectral square root values.

    BURST EXCITED LINEAR PREDICTION
    6.
    发明授权
    BURST EXCITED LINEAR PREDICTION 失效
    线性预测冲动刺激

    公开(公告)号：EP0744069B1

    公开(公告)日：2002-06-05

    申请号：EP95909433.5

    申请日：1995-02-01

    申请人： QUALCOMM INCORPORATED

    发明人： GARDNER, William, R.

    IPC分类号： G10L19/12

    CPC分类号： G10L19/12 ,  G10L2019/0013

    摘要： A novel and improved apparatus for encoding a signal which is bursty in nature. In a code excited linear prediction algorithm, short term redundancies and long term redundancies are removed from digitally sampled speech, and the residual signal which is bursty in nature must be encoded. The residual signal is encoded using three parameters a burst shape index corresponding to a burst shape in a codebook of burst shapes, a burst gain, and a burst location. Together the three parameters specify a waveform to match the residual signal. Further disclosed is a closed loop exhaustive search method by which to find the best match to the residual waveform and a partially open loop method wherein the burst location is determined by an open loop analysis of the residual waveform, and the burst shape and gain parameters are determined in a closed loop fashion. Also disclosed are methods by which a burst vector codebook may be provided which may result in reduced computational complexity in the search algorithms including a recursive burst codebook and a codebook structured in such a way that members of the codebook are linear combinations of other members of the codebook.

    BURST EXCITED LINEAR PREDICTION
    7.
    发明公开
    BURST EXCITED LINEAR PREDICTION 失效
    线性预测冲动刺激

    公开(公告)号：EP0744069A1

    公开(公告)日：1996-11-27

    申请号：EP95909433.0

    申请日：1995-02-01

    申请人： QUALCOMM INCORPORATED

    发明人： GARDNER, William, R.

    IPC分类号： G10L19

    CPC分类号： G10L19/12 ,  G10L2019/0013

    摘要： A novel and improved apparatus for encoding a signal which is bursty in nature. In a code excited linear prediction algorithm, short term redundancies and long term redundancies are removed from digitally sampled speech, and the residual signal which is bursty in nature must be encoded. The residual signal is encoded using three parameters a burst shape index corresponding to a burst shape in a codebook of burst shapes, a burst gain, and a burst location. Together the three parameters specify a waveform to match the residual signal. Further disclosed is a closed loop exhaustive search method by which to find the best match to the residual waveform and a partially open loop method wherein the burst location is determined by an open loop analysis of the residual waveform, and the burst shape and gain parameters are determined in a closed loop fashion. Also disclosed are methods by which a burst vector codebook may be provided which may result in reduced computational complexity in the search algorithms including a recursive burst codebook and a codebook structured in such a way that members of the codebook are linear combinations of other members of the codebook.