H - Electricity – 04 – J
Patent
H - Electricity
04
J
363/10
H04J 3/02 (2006.01) H04B 1/40 (2006.01)
Patent
CA 1150428
Abstract A radio transceiver is disclosed having manual controls on a microphone and the remainder of the circuitry located in a main chassis. The microphone and chassis are connected by means of a multiconductor cable, and time sharing multi- plexing techniques are utilized and serially transmit infor- mation, bidirectionally, along a common data line while a clock line is utilized to synchronize the operation of main chassis and microphone circuitry. Multiple bit binary coded digital words are sent to the microphone to activate micro- phone displays while analog signals are sent from the micro- phone to the main chassis to provide analog control signals for the transceiver. A digital synchronizing pulse detector is disclosed for use in the above transceiver multiplexing system. The detector identifies synchronizing pulses which occur in the clock signal wherein the identification insures the syn- chronization of microphone and main chassis circuitry. The transceiver provides for designating a subset of all of the available communication channels as desired channels, and in a memory mode the transceiver is tuned only to those desired channels. Distinctive visual displays are produced indicating if any channels have been designated as desired channels, and if all possible storage space for storing desired channel identification has been utilized. In addition, the dual use of a few pushbuttons is disclosed such that the sequence in which these pushbuttons are actu- ated determines the transceiver mode of operation selected.
365556
Bell Robert R.
Christians Scott T.
Gowling Lafleur Henderson Llp
Motorola Inc.
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