中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

19 records (took 0.022 seconds)

    2.
    发明专利
    未知

    公开(公告)号：FI870642A0

    公开(公告)日：1987-02-16

    申请号：FI870642

    申请日：1987-02-16

    Applicant: MOTOROLA INC

    Inventor： BORTH DAVID EDWARD ,  GERSON IRA ALAN ,  VILMUR RICHARD JOSEPH ,  SMANSKI PHILIP JEROME

    IPC: G10K11/178 ,  G10L21/0208 ,  G10L21/0216 ,  G10L25/27 ,  H03G3/34 ,  H04R25/00 ,  H04R27/00 ,  H03G

    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.

    3.
    发明专利
    未知

    公开(公告)号：FI870642A

    公开(公告)日：1987-02-16

    申请号：FI870642

    申请日：1987-02-16

    Applicant: MOTOROLA INC

    Inventor： BORTH DAVID EDWARD ,  GERSON IRA ALAN ,  VILMUR RICHARD JOSEPH ,  SMANSKI PHILIP JEROME

    IPC: G10K11/178 ,  G10L21/0208 ,  G10L21/0216 ,  G10L25/27 ,  H03G3/34 ,  H04R25/00 ,  H04R27/00 ,  H03G

    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.

    5.
    发明专利
    未知

    公开(公告)号：FI92118B

    公开(公告)日：1994-06-15

    申请号：FI870642

    申请日：1987-02-16

    Applicant: MOTOROLA INC

    Inventor： BORTH DAVID EDWARD ,  GERSON IRA ALAN ,  VILMUR RICHARD JOSEPH ,  SMANSKI PHILIP JEROME

    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.

    6.
    发明专利
    未知

    公开(公告)号：AT43467T

    公开(公告)日：1989-06-15

    申请号：AT85904543

    申请日：1985-09-03

    Applicant: MOTOROLA INC

    Inventor： BORTH DAVID EDWARD ,  GERSON IRA ALAN ,  VILMUR RICHARD JOSEPH

    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.

    METODO PARA OPTIMIZAR LA CALIDAD DE UNA SENAL RECIBIDA EN UN RECEPTOR DE RADIO Y DICHO RECEPTOR
    7.
    发明专利
    METODO PARA OPTIMIZAR LA CALIDAD DE UNA SENAL RECIBIDA EN UN RECEPTOR DE RADIO Y DICHO RECEPTOR 未知

    公开(公告)号：AR002163A1

    公开(公告)日：1998-01-07

    申请号：AR10282296

    申请日：1996-05-31

    Applicant: MOTOROLA INC

    Inventor： WAYNE RICH RANDALL ,  VILMUR RICHARD JOSEPH

    IPC: H04B1/10 ,  H04B7/005 ,  H03G3/20

    Abstract: Un receptor de radio (104) de acceso múltiple de división de códigos (CDMA) que tiene ganancia, recibe una senal de radiofrecuencia (RF) (122)para produciruna senal recobrada (124). Se determina (111) la calidad (130) de la senal recibida(124). La calidad (130)es preferentemente una relación entre la energíapor chip de la senal recibida (124). La calidad (130) es preferentemente una relación entre la energía por chip de la senal deseada (Ec)y la densidadespectral de intensidadtotal de l a senal recibida (Io)(124). Para otros receptores de radio (104) la calidad (130) puede ser una estimación de laproporción de errores de una senal desmodulada (126). La ganancia del receptor de radio (104) se ajusta como respuestaa la calida d (130) de la senal recibida(124).Asimismo, dado que la ganancia ajustada también cambia una indicación de intensidad de senal (RSSI) (242) de la senal recibida (124), se estima (217) yse compensa (218) la indicación de intensidad desenal recibida (242) de la senal recibida (124), como respuesta a la ganancia del receptor de radio (204)para producir una indicación de intensidad de senal recibida compensada (134) de la senal recibida (124) que indica la indicación deintensidad de senalre cibida (242) de la senal de radiofrecuencia deseada (122).

    Radio Subscriber Unit Having a Switched Antenna Diversity Apparatus and Method Therefor
    8.
    发明专利
    Radio Subscriber Unit Having a Switched Antenna Diversity Apparatus and Method Therefor 未知

    公开(公告)号：CA2189720A1

    公开(公告)日：1997-05-30

    申请号：CA2189720

    申请日：1996-11-06

    Applicant: MOTOROLA INC

    Inventor： BRUCKERT EUGENE J ,  VILMUR RICHARD JOSEPH ,  RICH RANDALL WAYNE

    IPC: H04B7/08 ,  H04B7/02 ,  H04Q7/32

    Abstract: A radio subscriber unit (102) comprises a controller (108) and a switched antenna diversity receiver apparatus (106) including a first antenna (114), a second antenna (116) and a receiver (126). The first antenna (114) is adapted to receive a first representation (158) of a radio frequency (RF) signal (156). The second antenna (116) is adapted to receive a second representation (160) of the RF signal (156). The receiver (126), selectively coupled to the first antenna (114) and the second antenna (116), generates a received signal (153) responsive to receiving at least one of the first representation (158) of the RF signal (156) from the first antenna (114) and the second representation (160) of the RF signal (156) from the second antenna (116). The controller (108), coupled to the receiver (126), selectively couples to the receiver (126), responsive to the received signal (153), one of: only the first antenna (114), only the second antenna (116) and both the first antenna (114) and the second antenna (116).

Patent Agency Ranking