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    Remote control system for operation over same audiochannel providing voice signals between remote station and base station
    3.
    发明授权
    Remote control system for operation over same audiochannel providing voice signals between remote station and base station 失效
    远程控制系统，用于在远程站点和基站之间提供语音信号的同一音频信道上进行操作

    公开(公告)号：US3577080A

    公开(公告)日：1971-05-04

    申请号：US3577080D

    申请日：1968-12-20

    Applicant: MOTOROLA INC

    Inventor： CANNALTE GARY A

    IPC: H04B1/40 ,  G08C19/12 ,  H04B1/02 ,  H04Q9/00 ,  H04B1/60

    CPC classification number: G08C19/12

    Abstract: Remote control system for controlling radio at base station from remote point over single audio channel which provides voice signals between remote and base stations, and which does not require DC continuity and operates within a fixed maximum frequency. A short burst of high amplitude guard tone is applied over the channel from the remote station to the base station to actuate a control at the base station which renders the controls thereat operative and blocks transmission of audiosignals from the base station to the channel. The remote station then applies lower amplitude tones to the audiochannel to actuate controls at the base station, with guard tone being applied continuously at low level during application of audio signals from the remote station to the base station. The base station responds to termination of tone signals (or to disconnect tones) to provide disconnect action, reset the controls and permit the base station to apply signals to the audio channel.

    Speech-noise discriminating constant pulse width squelch
    5.
    发明授权
    Speech-noise discriminating constant pulse width squelch 失效
    语音噪声识别恒定脉冲宽度SQUELCH

    公开(公告)号：US3603884A

    公开(公告)日：1971-09-07

    申请号：US3603884D

    申请日：1969-06-04

    Applicant: MOTOROLA INC

    Inventor： ZAURA PAUL J JR ,  HAWKINS GEORGE C ,  CANNALTE GARY A

    IPC: H03G3/34 ,  H04B1/10

    CPC classification number: H03G3/342

    Abstract: A squelch circuit for a receiver wherein the detected signals at the discriminator are amplified and converted to pulses of constant period or width. The pulses are detected and used to develop a control voltage to actuate an audio or transmitter switch. A decrease in the noise signal due to the presence of a proper radio frequency signal will decrease the pulse rate, increase the control voltage and actuate the switches allowing the audio signal to pass through the audio stages of the receiver and activating an associated transmitter.

    CENTERING MULTI-LEVEL DATA
    9.
    发明专利
    CENTERING MULTI-LEVEL DATA 未知

    公开(公告)号：CA2055470A1

    公开(公告)日：1990-11-27

    申请号：CA2055470

    申请日：1990-05-03

    Applicant: MOTOROLA INC

    Inventor： CANNALTE GARY A ,  BURKE DENNIS E

    IPC: H04L25/06 ,  H04L27/14 ,  H04L7/00

    Abstract: 2055470 9014727 PCTABS00002 There is provided a scheme for centering data prior to detection. It comprises: determining carrier frequency error, and pre-adjusting the data detection process to compensate for that error throughout the ensuing data detection. This scheme for reliable multilevel data detection further comprises: upon detection of carrier (C2, R5, G1) presence, determining carrier frequency error, gating a voltage associated with the frequency error (R1, R3, C1) to the differential amplification process to establish common mode rejection and compensating for that error throughout the ensuing multi-level data detection, and then analog-to-digital conversion of the differentially amplified multi-level data. A scheme for computationally centering the subsequent data detected (C3, R4) to compensate for the error is also provided.

    BASE STATION FEEDBACK REPORTING SYSTEM
    10.
    发明专利
    BASE STATION FEEDBACK REPORTING SYSTEM 未知

    公开(公告)号：CA1113620A

    公开(公告)日：1981-12-01

    申请号：CA312072

    申请日：1978-09-26

    Applicant: MOTOROLA INC

    Inventor： CANNALTE GARY A ,  RAMSLAND DAVID G

    IPC: H04Q9/00 ,  G08C25/02 ,  H04B7/26 ,  H04W24/00 ,  H04B1/02 ,  H04Q9/12

    Abstract: BASE STATION FEEDBACK REPORTING SYSTEM The operational status of equipment located at a base station is reported to a remote control terminal. The same audio channel that is used for sending audio signals and control signals to the base station is also used to carry the report signal. The control signals to the base station and the report signals from the base station are encoded tone burst signals. The report signal provides an indication of the proper receipt and execution of a control signal by the base station equipment. Equipment diagnostic signal and periodic checks of equipment performance are also reported by this system.

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