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55 records (took 0.024 seconds)

    31.
    发明专利
    未知

    公开(公告)号：SE9601283L

    公开(公告)日：1996-06-05

    申请号：SE9601283

    申请日：1996-04-03

    Applicant: MOTOROLA INC

    Inventor： PROCTER LEE MICHAEL ,  ASHLEY JAMES PATRICK

    IPC: H04J3/16 ,  H04W76/00

    Abstract: Signaling is inserted (102) into a communication channel of a communication system by inserting the signaling into the communication channel if the communication channel has sufficient available bandwidth (104). If the communication channel does not have sufficient available bandwidth, reducing the bandwidth of information being communicated on the communication channel (106) and inserting the signaling into the communication channel (108) with reduced information bandwidth.

    35.
    发明专利
    未知

    公开(公告)号：BR9913200A

    公开(公告)日：2001-05-15

    申请号：BR9913200

    申请日：1999-07-23

    Applicant: MOTOROLA INC

    Inventor： BROPHY JOHN DOUGLAS ,  ASHLEY JAMES PATRICK ,  PROCTOR LEE MICHAEL

    IPC: G10L19/00 ,  H04B7/26 ,  H04M1/00 ,  H04M3/00 ,  H04M7/00 ,  H04Q11/04 ,  H04W88/18 ,  H04Q7/00

    Abstract: Vocoder bypass is provided using in-band signaling. In preferred embodiments of the present invention, three signaling channels are arranged for transmission within the compressed speech. Each of the signaling channels are communicated at a preferred rate to permit fast, reliable detection of conditions indicating vocoder bypass mode of operation, to negotiate suitable vocoder type if necessary, and to synchronize and communicate compressed speech in a vocoder bypass mode of operation.

    36.
    发明专利
    未知

    公开(公告)号：BR9904633A

    公开(公告)日：2000-09-26

    申请号：BR9904633

    申请日：1999-05-27

    Applicant: MOTOROLA INC

    Inventor： PENG WEIMING ,  ASHLEY JAMES PATRICK

    IPC: G10L19/00 ,  G10L19/10 ,  G10L19/14 ,  H04Q7/32

    Abstract: A speech coder (400) for coding an information signal varies the codebook configuration based on parameters inherent in the information signal. The speech coder (400) requires no additional overhead for sending of mode parameters while allowing subframe resolution. The configurations vary not only for voicing level, but also for pitch period since different physiological traits yield different codebook configurations. A dispersion matrix (406) within the speech coder (400) facilitates a codebook search which is performed on vectors whose length can be less than a subframe length. Additionally, use of the dispersion matrix (406) allows the addition of random events for very slightly voiced speech which incurs little computational overhead but produces a rich excitation.

    37.
    发明专利
    未知

    公开(公告)号：BR9902610A

    公开(公告)日：2000-01-18

    申请号：BR9902610

    申请日：1999-05-28

    Applicant: MOTOROLA INC

    Inventor： ASHLEY JAMES PATRICK

    IPC: G10L25/90 ,  H03M13/00 ,  G10L9/00

    Abstract: A method and apparatus for improved pitch period (&tgr;) estimation in a compression system is disclosed. The system uses original estimates of integer lag (&tgr;0) and open-loop prediction gain (betaol) as input to an adaptive filter parameter initialization block (304) which supplies inputs to a plurality of adaptive filter elements (306-308). Adaptive filter elements (306-308) provide information regarding the harmonics of the residual signal (epsi(n)) to an adaptive filter parameter analysis block (310). Adaptive filter parameter analysis block (310) estimates the fundamental frequency of the residual signal based on the analysis of the harmonics and outputs a pitch period (&tgr;) for eventual use in a delay contour computation.

    38.
    发明专利
    未知

    公开(公告)号：BR9708166A

    公开(公告)日：1999-07-27

    申请号：BR9708166

    申请日：1997-01-24

    Applicant: MOTOROLA INC

    Inventor： ASHLEY JAMES PATRICK ,  PROCTOR LEE MICHAEL

    IPC: H04L12/18 ,  H04B7/26 ,  H04M3/56 ,  H04Q11/00 ,  H04W4/00

    Abstract: An apparatus (200) for providing a multi-party speech connection for use in a wireless communication system (10). The apparatus (200) comprises a first speech encoder (202) producing a first encoded speech signal, a second speech encoder (20) producing a second encoded speech signal, a conference circuit (22), and a speech decoder (208) responsive to the conference circuit (22). The conference circuit (22) receives the first and second speech encoded signals and produces a multiplexed encoded speech signal. The speech decoder (208) receives the multiplexed encoded speech signal and produces a decoded speech signal.

    Method and apparatuus for suppressing noise in a communication system
    40.
    发明专利
    Method and apparatuus for suppressing noise in a communication system 未知

    公开(公告)号：GB2313266A

    公开(公告)日：1997-11-19

    申请号：GB9713727

    申请日：1996-09-04

    Applicant: MOTOROLA INC

    Inventor： ASHLEY JAMES PATRICK

    IPC: H04B1/10 ,  G10L21/02 ,  H04B15/00 ,  H04Q7/20

    Abstract: A noise suppression system (109) implemented in communication system (700) provides an improved update decision during instances of sudden increase in background noise level. The noise suppression system (109), infer alia, generates an update by continually monitoring the deviation of spectral energy and forcing an update based on a predetermined threshold criterion. The spectral energy deviation is determined by utilizing an element which has the past values of the power spectral components exponentially weighted. The exponential weighting is a function of the current input energy, which means the higher the input signal energy, the longer the exponential window. Conversely, the lower the signal energy, the shorter the exponential window. The noise suppression system (109) also inhibits a forced update during periods of continuous, non-stationary input signals (such as "music-on-hold").

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