Telecommunications – Transmitter and receiver at same station – With a common signal processing stage
Patent
1980-06-09
1983-02-08
Chin, Tommy P.
Telecommunications
Transmitter and receiver at same station
With a common signal processing stage
H04B 140
Patent
active
043732054
ABSTRACT:
A radio subscriber system switches between a plurality of radio link channels and seizes one responsive to an idle tone appearing thereon. A control circuit uses a microprocessor to select transmit and receive carrier frequencies for the seized channel. This selection is made by storing the channel identification in a random access memory while interrogating a read-only memory for channel frequency assignments. The control circuit identifies the seized circuit by channel signals which are demodulated when the seizure occurs.
REFERENCES:
patent: 3426279 (1969-02-01), Berman
patent: 3829778 (1974-08-01), Amoroso, Jr.
patent: 4153876 (1979-05-01), Cochran
patent: 4231116 (1980-10-01), Sekiguchi
PR 1010 Reginal Crime Squad Radio Transceiver, by A.D. Currah, International Conference on Communications Equipment and Systems, Brighton, Sussex, England (8-11, Jun. 1976) pp. 106-109.
Radio Subscribed System, by Miyawaki, et al., NEC Research & Development, No. 53, Apr. 1979, pp. 36-45.
Phase locked loop Systems, Data Book, Motorola Semiconductor Products Inc. Second Edition, Aug. 1973, pp. 1-11.
Chin Tommy P.
Nippon Electric Co. Ltd.
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