Telecommunications – Transmitter and receiver at same station – With tuning
Patent
1979-12-31
1982-02-23
Ng, Jin F.
Telecommunications
Transmitter and receiver at same station
With tuning
455151, 455355, H04B 140
Patent
active
043172229
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 multiplexing techniques are utilized and serially transmit information, 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 microphone displays while analog signals are sent from the microphone 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 synchronization 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 actuated determines the transceiver mode of operation selected.
REFERENCES:
patent: 4110690 (1978-08-01), Kakigi
patent: 4147984 (1979-04-01), Caudel et al.
patent: 4153877 (1979-05-01), Fathauer et al.
patent: 4197498 (1980-04-01), Fukui et al.
Bell Robert R.
Christians Scott T.
Gillman James W.
Melamed Phillip H.
Motorola Inc.
Ng Jin F.
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