中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

14 records (took 0.022 seconds)

    1.
    发明专利
    未知

    公开(公告)号：DE69620585T2

    公开(公告)日：2002-11-28

    申请号：DE69620585

    申请日：1996-01-25

    Applicant: QUALCOMM INC

    Inventor： WEAVER A ,  LAM KATHERINE ,  JACOBS E ,  GARDNER R ,  DEJACO P ,  SIH C

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

    2.
    发明专利
    未知

    公开(公告)号：DE69620585D1

    公开(公告)日：2002-05-16

    申请号：DE69620585

    申请日：1996-01-25

    Applicant: QUALCOMM INC

    Inventor： WEAVER A ,  LAM KATHERINE ,  JACOBS E ,  GARDNER R ,  DEJACO P ,  SIH C

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

    3.
    发明专利
    未知

    公开(公告)号：DE60209256T2

    公开(公告)日：2006-11-23

    申请号：DE60209256

    申请日：2002-11-01

    Applicant: QUALCOMM INC

    Inventor： WILBORN B ,  GARDNER R ,  MOLLENKOPF M

    IPC: H04B7/26 ,  H04B17/00 ,  H04B1/00 ,  H04B7/005

    Abstract: A method, apparatus and computer program product for predicting received signal strength in a wireless mobile receiver. The invention bounds the range of allowed values for a next predicted signal. The bounded prediction compensates for erroneous values from multipath fading. The predicted signal strength is used to set the mobile receiver amplifier gain to the desired level.

    4.
    发明专利
    未知

    公开(公告)号：DE60209256D1

    公开(公告)日：2006-04-20

    申请号：DE60209256

    申请日：2002-11-01

    Applicant: QUALCOMM INC

    Inventor： WILBORN B ,  GARDNER R ,  MOLLENKOPF M

    IPC: H04B7/26 ,  H04B17/00 ,  H04B1/00 ,  H04B7/005

    Abstract: A method, apparatus and computer program product for predicting received signal strength in a wireless mobile receiver. The invention bounds the range of allowed values for a next predicted signal. The bounded prediction compensates for erroneous values from multipath fading. The predicted signal strength is used to set the mobile receiver amplifier gain to the desired level.

    5.
    发明专利
    未知

    公开(公告)号：DE69621620T2

    公开(公告)日：2003-02-06

    申请号：DE69621620

    申请日：1996-08-01

    Applicant: QUALCOMM INC

    Inventor： GARDNER R ,  MANJUNATH SHARATH ,  MONTA PETER

    IPC: G10L19/02 ,  G10L19/00 ,  G10L19/04 ,  G10L19/06 ,  H03M7/30 ,  H03M7/36 ,  H04B14/04

    Abstract: A novel and improved method and apparatus for encoding line predictive coding (LPC) data in a speech compression system using line spectral square root values is disclosed. A novel and computationally efficient procedure for determining the set of quantization sensitivities for the line spectral square root values is disclosed, which results in a computationally efficient error measure for use in vector quantization of the line spectral square root values. A novel method of weighting the quantization error is disclosed, which accumulates the quantization error in each line spectral square root value and weights that error by the sensitivity of that line spectral square root value.\!

    6.
    发明专利
    未知

    公开(公告)号：DE69429270D1

    公开(公告)日：2002-01-10

    申请号：DE69429270

    申请日：1994-09-08

    Applicant: QUALCOMM INC

    Inventor： GARDNER R ,  JACOBS E ,  PADOVANI ROBERTO ,  ZIV A ,  LAM KATHERINE ,  DEJACO P

    IPC: H04B7/26 ,  H04L1/00 ,  H04L12/00 ,  H04L12/56 ,  H04Q11/04 ,  H04W24/00 ,  H04W28/22 ,  H04L1/12 ,  H04Q7/38

    Abstract: A method and apparatus are described for controlling the data rates for communications to and from a base station and a plurality of remote users. The usage of the communications resource whether the forward link resource (from base station to remote users) or reverse link resource (from remote users to base station) is measured. The measured usage value is compared against at least one predetermined threshold value and the data rates of communications or a subset of communications on said communications resource is modified in accordance with said comparisons.

    7.
    发明专利
    未知

    公开(公告)号：DE69526926T2

    公开(公告)日：2003-01-02

    申请号：DE69526926

    申请日：1995-02-01

    Applicant: QUALCOMM INC

    Inventor： GARDNER R

    IPC: G10L19/08 ,  G10L19/00 ,  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.

    8.
    发明专利
    未知

    公开(公告)号：DE69429270T2

    公开(公告)日：2002-07-25

    申请号：DE69429270

    申请日：1994-09-08

    Applicant: QUALCOMM INC

    Inventor： GARDNER R ,  JACOBS E ,  PADOVANI ROBERTO ,  ZIV A ,  LAM KATHERINE ,  DEJACO P

    IPC: H04B7/26 ,  H04L1/00 ,  H04L12/00 ,  H04L12/56 ,  H04Q11/04 ,  H04W24/00 ,  H04W28/22 ,  H04L1/12 ,  H04Q7/38

    Abstract: A method and apparatus are described for controlling the data rates for communications to and from a base station and a plurality of remote users. The usage of the communications resource whether the forward link resource (from base station to remote users) or reverse link resource (from remote users to base station) is measured. The measured usage value is compared against at least one predetermined threshold value and the data rates of communications or a subset of communications on said communications resource is modified in accordance with said comparisons.

Patent Agency Ranking