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    62.
    发明专利
    未知

    公开(公告)号：PT95577A

    公开(公告)日：1992-08-31

    申请号：PT9557790

    申请日：1990-10-12

    Applicant: MOTOROLA INC

    Inventor： LABEDZ GERALD PAUL ,  BORTH DAVID EDWARD ,  RASKY PHILLIP DAVID

    IPC: H04L25/08 ,  H04L25/03 ,  H04L27/00 ,  H04L27/01 ,  H04B7/00

    Abstract: In a communications network having time-dispersed signals, there is provided a mechanism for soft decision decoding. It comprises: radio reception of a time-dispersed signal, at least partly equalizing those time-dispersal effects, recovering information contained in the signal, multiplying with that recovered information the absolute value of that at-least-partly-equalized signal (scaled by a number derived from channel conditions over a time during which at least part of the information to be recovered is distributed), and error-correcting the multiplied information by a Viterbi algorithm channel decoding scheme of error correction. Accordingly, soft decision information is generated from within the equalization process itself.

    HANDS-FREE CONTROL SYSTEM FOR A RADIO-TELEPHONE
    63.
    发明专利
    HANDS-FREE CONTROL SYSTEM FOR A RADIO-TELEPHONE 未知

    公开(公告)号：HK54192A

    公开(公告)日：1992-07-30

    申请号：HK54192

    申请日：1992-07-23

    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.

    65.
    发明专利
    未知

    公开(公告)号：DE68928362T2

    公开(公告)日：1998-03-19

    申请号：DE68928362

    申请日：1989-12-11

    Applicant: MOTOROLA INC

    Inventor： BORTH DAVID EDWARD ,  KEPLER JAMES FRANK MICHAEL

    IPC: H03L7/095 ,  H03J7/02 ,  H03L7/08 ,  H03L7/087 ,  H03L7/093

    Abstract: There is provided a method of and apparatus for Automatice Frequency Control (AFC) of pure sine waves (PSW). It is characterized by discriminating to detect frequency differences between a received pure sine wave and a reference frequency (20), integrating (30) the frequency differences to average the differences, and adjusting (40) the reference frequency (80) to eliminate the frequency difference. It is further characterized by digitizing, in quadrature, the received pure sine wave (70), mixing (50) the received pure sine wave with a complex sinusoid to translate the pure sine wave to baseband, quadrature filtering (60) the mixed sine wave, cross-product discrimination (20) to detect frequency differences between a received pure sine wave and a reference frequency, integration (30) the frequency differences to average the differences, selectively (100/110) calculating the mean/variance (90) between the pure sine wave and the reference frequency, and adjusting (40) the reference frequency of a Voltage Controlled Oscillator 80 to eliminate the frequency difference.

    66.
    发明专利
    未知

    公开(公告)号：DE68928362D1

    公开(公告)日：1997-11-06

    申请号：DE68928362

    申请日：1989-12-11

    Applicant: MOTOROLA INC

    Inventor： BORTH DAVID EDWARD ,  KEPLER JAMES FRANK MICHAEL

    IPC: H03L7/095 ,  H03J7/02 ,  H03L7/08 ,  H03L7/087 ,  H03L7/093

    Abstract: There is provided a method of and apparatus for Automatice Frequency Control (AFC) of pure sine waves (PSW). It is characterized by discriminating to detect frequency differences between a received pure sine wave and a reference frequency (20), integrating (30) the frequency differences to average the differences, and adjusting (40) the reference frequency (80) to eliminate the frequency difference. It is further characterized by digitizing, in quadrature, the received pure sine wave (70), mixing (50) the received pure sine wave with a complex sinusoid to translate the pure sine wave to baseband, quadrature filtering (60) the mixed sine wave, cross-product discrimination (20) to detect frequency differences between a received pure sine wave and a reference frequency, integration (30) the frequency differences to average the differences, selectively (100/110) calculating the mean/variance (90) between the pure sine wave and the reference frequency, and adjusting (40) the reference frequency of a Voltage Controlled Oscillator 80 to eliminate the frequency difference.

    68.
    发明专利
    未知

    公开(公告)号：PT92601B

    公开(公告)日：1996-07-31

    申请号：PT9260189

    申请日：1989-12-15

    Applicant: MOTOROLA INC

    Inventor： BORTH DAVID EDWARD ,  KEPLER JAMES FRANK MICHAEL

    IPC: H04L27/00 ,  H04L27/14 ,  H04L27/18 ,  H04L27/227 ,  H04L27/22

    Abstract: There is provided a method of and apparatus for Automatic Frequency Control (AFC) in the presence of data. It comprises removing the effects of data modulated onto the carrier (25), detecting the frequency difference between the carrier frequency and the phase of the reference oscillator (30), and adjusting (80) the frequency of the reference oscillator (35) to eliminate the frequency difference ( DELTA ). It is further characterized by digitizing (40) the modulated carrier in quadrature, sampling (20) the modulated carrier in quadrature at a multiple of the modulated bit rate, rotating phases toward arctangent (I/Q)=0 (25/55/60) to remove the effects of quadrature data (I/Q) modulated onto the carrier, detecting (30) the frequency difference ( DELTA ) between the carrier frequency and the frequency of a Voltage Controlled type of reference oscillator (35) with a phase trajectory estimator (45), and establishing and generating the requisite correction voltage ( DELTA ) for a Voltage Controlled type of reference oscillator (VCO) (35) with the phase trajectory estimator (45).

    69.
    发明专利
    未知

    公开(公告)号：DE68923857T2

    公开(公告)日：1996-04-04

    申请号：DE68923857

    申请日：1989-12-11

    Applicant: MOTOROLA INC

    Inventor： BORTH DAVID EDWARD ,  KEPLER JAMES FRANK MICHAEL

    IPC: H04L27/14 ,  H04L27/00 ,  H04L27/18 ,  H04L27/227 ,  H04L27/22

    Abstract: There is provided a method of and apparatus for Automatic Frequency Control (AFC) in the presence of data. It comprises removing the effects of data modulated onto the carrier (25), detecting the frequency difference between the carrier frequency and the phase of the reference oscillator (30), and adjusting (80) the frequency of the reference oscillator (35) to eliminate the frequency difference ( DELTA ). It is further characterized by digitizing (40) the modulated carrier in quadrature, sampling (20) the modulated carrier in quadrature at a multiple of the modulated bit rate, rotating phases toward arctangent (I/Q)=0 (25/55/60) to remove the effects of quadrature data (I/Q) modulated onto the carrier, detecting (30) the frequency difference ( DELTA ) between the carrier frequency and the frequency of a Voltage Controlled type of reference oscillator (35) with a phase trajectory estimator (45), and establishing and generating the requisite correction voltage ( DELTA ) for a Voltage Controlled type of reference oscillator (VCO) (35) with the phase trajectory estimator (45).

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