H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/121, 325/72
H04B 1/16 (2006.01) H03G 3/34 (2006.01)
Patent
CA 1182181
Abstract Data muting apparatus is described that mutes data signals communicated between a central station and mobile and portable radios in a dispatch radio communications system. A dispatcher at the central station also com- municates with operators of the mobile and portable radios. The central station includes a base station having an RF transmitter and RF receiver, 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 RF receiver and RF transmitter, respectively, 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 transmitter and receiver, respectively. 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 receiver in the receive signal line. The GCC and mobile and portable radios include data muting apparatus embodying the present invention. The data muting apparatus includes a detector for detecting the presence of a carrier signal and muting circuitry for muting the receiver 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 receiver output. Thus, data signals at the beginning of each communication are muted without impairing voice communications. furthermore, since the receiver output is muted until the last bit of the data signal is detected, the muting apparatus can accommodate variable length data signals.
414362
Freeburg Thomas A.
Milleker William
Stepien Michael A.
Gowling Lafleur Henderson Llp
Motorola Inc.
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