Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1980-09-15
1984-12-04
Rubinson, Gene Z.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
179 2E, 455 77, 455 89, H04M 100
Patent
active
044866240
ABSTRACT:
An improved radiotelephone includes a unique microprocessor and peripheral devices for controlling the operation of portable or mobile radio transceivers in a cellular-type radiotelephone system. The microprocessor is coupled by a data interface unit and synchronization unit to the radio transceiver for transmitting and receiving Manchester-coded supervisory signalling having a 10 KHz bit rate. The microprocessor is also coupled by a unique self-clocking serial data bus and unique interface adapters to the radio transceiver for controlling the operating frequency, audio signals and transmitted RF signal thereof, to a keyboard for sampling the keys thereof, an off-hook switch and display for displaying telephone numbers, and to serial number and telephone number memories for accessing the stored serial and telephone numbers assigned to the radiotelephone. The microprocessor-controlled radiotelephone can be substantially adapted to operate a system selected from a wide variety of conventional and advanced radiotelephone systems by tailoring the microprocessor control program to meet the selected system specifications.
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Puhl Larry C.
Smedinghoff John F.
Brady W. J.
Gillman James W.
Hackbart Rolland R.
Motorola Inc.
Roney Edward M.
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