H - Electricity – 04 – B
Patent
H - Electricity
04
B
330/22, 325/32,
H04B 1/00 (2006.01) H03G 1/02 (2006.01)
Patent
CA 1231386
REMOTE CONTROL SYSTEM HAVING SYMMETRICAL TONE, SEND/RECEIVE SIGNALLING CIRCUITS FOR RADIO COMMUNICATIONS Abstract The remote control system having symmetrical signalling circuits for radio communications is coupled to a single wire line/audio channel 26 and permits two or more units, base stations 12 and/or remote consoles 14, to be coupled to the single wire line. Each signalling circuit comprises a wire line coupler 48 for coupling to the wire line 26, an audio input 46 line and an audio output 44 line. An automatic gain control circuit 56 is coupled between the wire coupler 48 and the audio output 44 line and a filter 104 and line driver 106 are coupled between the audio input 46 line and the wire coupler 48. A control unit 70 including a microprocessor 71, a tone encoder 214, a tone decoder 210, a timer, a clock, and a memory 212 is coupled by output lines to the automatic gain control circuit 56 for controlling the modes of operation thereof which include a slow decay mode, a fast decay mode, an adapt mode and a hold gain mode. The output from the gain control circuit 56 is also routed through a bandpass filter 64 and a limiter 67 to the control unit 70. Further, the tone encoder 214 of the control unit 70 is coupled to a summing circuit 102 situated between the filter 104 and line driver 106 through a filter 97 and level control circuit 100. The protocol programmed in the microprocessor enables any unit to take control of the audio channel 26 by initiating the sending of a message. Also mute gates 60,80 are provided for disabling audio output or audio input while a message is being sent or received over the audio channel 26.
471381
Budnik Brian J.
Dolikian Arman V.
Kotzin Michael D.
Gowling Lafleur Henderson Llp
Motorola Inc.
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