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    41.
    发明专利
    未知

    公开(公告)号：ES2177631T3

    公开(公告)日：2002-12-16

    申请号：ES95909433

    申请日：1995-02-01

    Applicant: QUALCOMM INC

    Inventor： GARDNER WILLIAM R

    IPC: G10L19/00 ,  G10L19/08 ,  G10L19/04 ,  G10L19/12

    Abstract: 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.

    44.
    发明专利
    未知

    公开(公告)号：DK0624275T3

    公开(公告)日：1999-11-15

    申请号：DK93904649

    申请日：1993-01-26

    Applicant: QUALCOMM INC

    Inventor： GARDNER WILLIAM R ,  JACOBS PAUL E

    IPC: G10L19/00 ,  G10L19/02 ,  G10L19/06 ,  H03M13/35 ,  H04B1/66 ,  H04L1/00 ,  G10L9/02

    Abstract: A method and system by which parameter data representative of vocoded speech are organized into a data packet for transmission so as to reduce the impact of transmission channel induced errors on the data packet. A data packet is constructed with certain most perceptually significant bits of parameter data at the beginning of the data packet. Following in the data packet are lesser perceptually significant bits of the same parameter data. Other parameter data then follows in the data packet. Interleaved in the data packet following the most perceptually significant bits at the beginning of the data packet are most perceptually significant bits of other parameter data. A parity check code is computed from the most perceptually significant bits in the data packet and also interleaved in the data packet following the most perceptually significant bits at the beginning of the data packet.

    45.
    发明专利
    未知

    公开(公告)号：AT180091T

    公开(公告)日：1999-05-15

    申请号：AT93904649

    申请日：1993-01-26

    Applicant: QUALCOMM INC

    Inventor： GARDNER WILLIAM R ,  JACOBS PAUL E

    IPC: G10L19/02 ,  G10L19/00 ,  G10L19/06 ,  H03M13/35 ,  H04B1/66 ,  H04L1/00 ,  G10L9/02

    Abstract: A method and system by which parameter data representative of vocoded speech are organized into a data packet for transmission so as to reduce the impact of transmission channel induced errors on the data packet. A data packet is constructed with certain most perceptually significant bits of parameter data at the beginning of the data packet. Following in the data packet are lesser perceptually significant bits of the same parameter data. Other parameter data then follows in the data packet. Interleaved in the data packet following the most perceptually significant bits at the beginning of the data packet are most perceptually significant bits of other parameter data. A parity check code is computed from the most perceptually significant bits in the data packet and also interleaved in the data packet following the most perceptually significant bits at the beginning of the data packet.

    48.
    发明专利
    未知

    公开(公告)号：BR9606800A

    公开(公告)日：1997-12-30

    申请号：BR9606800

    申请日：1996-01-25

    Applicant: QUALCOMM INC

    Inventor： WEARVER LINDSAY A JR ,  SIH GILBERT C ,  JACOBS PAUL E ,  GARDNER WILLIAM R ,  LAM S KATHERINE ,  DEJACO ANDREW P

    IPC: G10L11/02 ,  G10L19/00 ,  G10L19/14 ,  H04B7/26 ,  H04B14/04 ,  H04Q11/04 ,  H04W88/18 ,  G10L5/00 ,  H04Q7/24

    Abstract: When one vocoding system is coupled to another vocoding system, a tandem arrangement results. The tandem configuration results in voice quality degradation as speech is encoded and decoded, then encoded and decoded again. One reason for the degradation is that postfiltering performed at the output of the speech decoding process introduces distortions in the spectral content of the reconstructed speech as compared to the original speech. The present invention prevents the degradation due to the use of postfilters by modifying the postfiltering within the vocoders where a tandem configuration exists. A detection code is embedded within the data signal to indicate the existence of a tandem configuration. If the detection code is received at a vocoder, modified vocoding is established within the vocoders to prevent the degradation due to the postfiltering.

    METHOD OF AND SYSTEM FOR ORDERING DATA OF AN ENCODER FOR MASKING ERRORS OCCURRING IN A TRANSMISSION CHANNEL
    49.
    发明专利
    METHOD OF AND SYSTEM FOR ORDERING DATA OF AN ENCODER FOR MASKING ERRORS OCCURRING IN A TRANSMISSION CHANNEL 未知

    公开(公告)号：PL172397B1

    公开(公告)日：1997-09-30

    申请号：PL30598493

    申请日：1993-01-26

    Applicant: QUALCOMM INC

    Inventor： GARDNER WILLIAM R ,  JACOBS PAUL E

    IPC: G10L19/00 ,  G10L19/02 ,  G10L19/06 ,  H03M13/35 ,  H04B1/66 ,  H04L1/00 ,  G10L9/02

    Abstract: A method and system by which parameter data representative of vocoded speech are organized into a data packet for transmission so as to reduce the impact of transmission channel induced errors on the data packet. A data packet is constructed with certain most perceptually significant bits of parameter data at the beginning of the data packet. Following in the data packet are lesser perceptually significant bits of the same parameter data. Other parameter data then follows in the data packet. Interleaved in the data packet following the most perceptually significant bits at the beginning of the data packet are most perceptually significant bits of other parameter data. A parity check code is computed from the most perceptually significant bits in the data packet and also interleaved in the data packet following the most perceptually significant bits at the beginning of the data packet.

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