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公开(公告)号：DE3278848D1
公开(公告)日：1988-09-01
申请号：DE3278848
申请日：1982-11-12
Applicant: MOTOROLA INC
Inventor： MILLEKER WILLIAM , FREEBURG THOMAS , STEPIEN MICHAEL
Abstract: Data muting apparatus is described that mutes variable-length data signals communicated between a central station and mobile and portable radios in a dispatch radio communications system. The central station includes a base station transceiver, a dispatcher console, a general communications controller (GCC), a digital communications computer and a display terminal. The base station transmitter and receiver communicate over an RF duplex channel to the transceiver of the mobile and portable radios. The dispatcher console provides for voice communications and is coupled by a transmit signal line and a receive signal line to the base station transceiver. The GCC provides for data communications and is also coupled to the transmit signal line and is interposed between the dispatcher console and the base station transceiver in the receive signal line. The GCC and mobile and portable radios include data muting apparatus enbodying the present invention. The data muting apparatus includes a detector for detecting the presence of a carrier signal and muting circuitry for muting the transceiver output for a predetermined time interval when a carrier signal has been detected. During the predetermined time interval, other circuitry may detect a synchronization word in a received data signal and mute the receiver output until still other circuitry detects the last bit of a following information word in the received data signal and unmutes the transceiver output. Thus, data signals at the beginning of each communication are muted without impairing voice communications.
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公开(公告)号：HK18890A
公开(公告)日：1990-03-16
申请号：HK18890
申请日：1990-03-08
Applicant: MOTOROLA INC
Inventor： MILLEKER WILLIAM , FREEBURG THOMAS , STEPIEN MICHAEL
Abstract: Data muting apparatus is described that mutes variable-length data signals communicated between a central station and mobile and portable radios in a dispatch radio communications system. The central station includes a base station transceiver, a dispatcher console, a general communications controller (GCC), a digital communications computer and a display terminal. The base station transmitter and receiver communicate over an RF duplex channel to the transceiver of the mobile and portable radios. The dispatcher console provides for voice communications and is coupled by a transmit signal line and a receive signal line to the base station transceiver. The GCC provides for data communications and is also coupled to the transmit signal line and is interposed between the dispatcher console and the base station transceiver in the receive signal line. The GCC and mobile and portable radios include data muting apparatus enbodying the present invention. The data muting apparatus includes a detector for detecting the presence of a carrier signal and muting circuitry for muting the transceiver output for a predetermined time interval when a carrier signal has been detected. During the predetermined time interval, other circuitry may detect a synchronization word in a received data signal and mute the receiver output until still other circuitry detects the last bit of a following information word in the received data signal and unmutes the transceiver output. Thus, data signals at the beginning of each communication are muted without impairing voice communications.
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公开(公告)号：EP0094420A4
公开(公告)日：1985-07-01
申请号：EP83900135
申请日：1982-11-12
Applicant: MOTOROLA INC
Inventor： MILLEKER WILLIAM , FREEBURG THOMAS , STEPIEN MICHAEL
CPC classification number: H03G3/34
Abstract: Apparatus that mutes data signals communicated between a central station (100) and mobile (120) and portable radios (122) in a dispatch radio system. The centraL station (100) includes a base station (110) having an RF transmitter and RF receiver, a dispatcher console (102), a general communications controller (GCC), (104), a digital communications computer (108) and a display terminal (106). The dispatcher console provides for voice communications. The GCC (104) provides for data communications. The GCC (104) and mobile (120) and portable radios (122) include data muting apparatus embodying the present invention. The data muting apparatus includes a noise detector (210, 602) for detecting the presence of a carrier signal and muting circuitry (220, 606) for muting the receiver output for a predetermined time interval when a carrier signal has been detected. During the predetermined time interval, other circuitry (620) may detect a synchronization word in a received data signal and mute the receiver output until still other circuitry (626) detects the last bit of a following information work and unmutes the receiver output.
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