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    HANDS-FREE CONTROL SYSTEM FOR A RADIOTELEPHONE
    4.
    发明专利
    HANDS-FREE CONTROL SYSTEM FOR A RADIOTELEPHONE 未知

    公开(公告)号：DE3570569D1

    公开(公告)日：1989-06-29

    申请号：DE3570569

    申请日：1985-09-03

    Applicant: MOTOROLA INC

    Inventor： BORTH DAVID ,  GERSON IRA ,  VILMUR RICHARD

    IPC: G10L15/00 ,  G10L15/02 ,  G10L15/20 ,  G10L21/02 ,  H04M1/27 ,  H04M1/274 ,  H04M1/2745 ,  H04M1/60 ,  G10L7/08

    Abstract: PCT No. PCT/US85/01672 Sec. 371 Date Sep. 3, 1985 Sec. 102(e) Date Sep. 3, 1985 PCT Filed Sep. 3, 1985 PCT Pub. No. WO87/01546 PCT Pub. Date Mar. 12, 1987.An improved hands-free user-interactive control and dialing system is disclosed for use with a speech communications device. The control system (400) includes a dynamic noise suppressor (410), a speech recognizer (420) for implementing voice-control, a device controller (430) responsive to the speech recognizer for controlling operating parameters of the speech communications device (450) and for producing status information representing the operating status of the device, and a speech synthesizer (440) for providing reply information to the user as to the speech communications device operating status. In a mobile radiotelephone application, the spectral subtraction noise suppressor (414) is configured to improve the performance of the speech recognizer (424), the voice quality of the transmitted audio (417), and the audio switching operation of the vehicular speakerphone (460). The combination of noise processing, speech recognition, and speech synthesis provides a substantial improvement to prior art control systems.

    5.
    发明专利
    未知

    公开(公告)号：DE3856280T2

    公开(公告)日：1999-08-12

    申请号：DE3856280

    申请日：1988-09-22

    Applicant: MOTOROLA INC

    Inventor： VILMUR RICHARD ,  BARLO JOSEPH ,  GERSON IRA ,  LINDSLEY BRETT

    IPC: H01B1/10 ,  G10L11/02 ,  G10L21/02 ,  G10L25/93 ,  H01B15/00 ,  H04B1/10 ,  H04B15/00

    Abstract: An improved noise suppression system (800) is disclosed which performs speech quality enhancement upon the speech-plus-noise signal available at the input (205) to generate a clean speech signal at the output (265) by spectral gain modification. The improvements of the present invention include the addition of a signal-to-noise ratio (SNR) threshold mechanism (830) to reduce background noise flutter by offsetting the gain rise of the gain tables until a certain SNR threshold is reached, the use of a voice metric calculator (810) to produce more accurate background noise estimates via performing the update decision based on the overall voice-like characteristics in the channels and the time interval since the last update, and the use of a channel SNR modifier (820) to provide immunity to narrowband noise bursts through modification of the SNR estimates based on the voice metric calculation and the channel energies.

    6.
    发明专利
    未知

    公开(公告)号：DE3856280D1

    公开(公告)日：1999-01-21

    申请号：DE3856280

    申请日：1988-09-22

    Applicant: MOTOROLA INC

    Inventor： VILMUR RICHARD ,  BARLO JOSEPH ,  GERSON IRA ,  LINDSLEY BRETT

    IPC: H01B1/10 ,  G10L11/02 ,  G10L21/02 ,  G10L25/93 ,  H01B15/00 ,  H04B1/10 ,  H04B15/00

    Abstract: An improved noise suppression system (800) is disclosed which performs speech quality enhancement upon the speech-plus-noise signal available at the input (205) to generate a clean speech signal at the output (265) by spectral gain modification. The improvements of the present invention include the addition of a signal-to-noise ratio (SNR) threshold mechanism (830) to reduce background noise flutter by offsetting the gain rise of the gain tables until a certain SNR threshold is reached, the use of a voice metric calculator (810) to produce more accurate background noise estimates via performing the update decision based on the overall voice-like characteristics in the channels and the time interval since the last update, and the use of a channel SNR modifier (820) to provide immunity to narrowband noise bursts through modification of the SNR estimates based on the voice metric calculation and the channel energies.

    10.
    发明专利
    未知

    公开(公告)号：DE3689035T2

    公开(公告)日：1994-01-20

    申请号：DE3689035

    申请日：1986-05-05

    Applicant: MOTOROLA INC

    Inventor： BORTH DAVID ,  GERSON IRA ,  VILMUR RICHARD ,  SMANSKI PHILIP

    IPC: G10K11/178 ,  G10L21/0208 ,  G10L21/0216 ,  G10L25/27 ,  H03G3/34 ,  H04R25/00 ,  H04R27/00

    Abstract: An improved noise suppression system (400) which performs speech quality enhancement upon speech-plus-noise signal available at the input (205) to generate a clean speech signal at the output (265) by spectral gain modification. The noise suppression system includes a background noise estimator (420) which generates and stores an estimate of the background noise power spectral density based upon pre-processed speech (215), as determined by the detected minima of the post-processed speech energy level. This post-processed speech (255) may be obtained directly from the output of the noise supression system, or may be simulated by multiplying the pre-processed speech energy (225) by the channel gain values of the modification signal (245). The channel gain controller (240) produces these individual channel gain values for application to both the channel gain modifier (250) and the background noise estimator (420). Each individual channel gain value is selected as a function of (a) the channel number, (b) the current channel SNR estimate, and (c) the overall average background noise level. The technique of implementing post-processed signal to generate the background noise estimate (325) provides a more accurate measurement of the background noise energy since it is based upon much cleaner speech signal. As a result, the present invention performs acoustic noise suppression in high ambient noise backgrounds with significantly less voice quality degradation.

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