Code operated switching device for communications systems and th

Details Code operated switching device for communications systems and th Code operated switching device for communications systems and th

1973-07-05

1976-02-03

Safourek, Benedict V.

Telegraphy

Systems

Printing

325308, 325 55, 325320, 178DIG13, H04B 106, H02B 100, H04B 100, H04B 116

Patent

active

039367479

ABSTRACT:
The embodiment of the invention disclosed herein is directed to a code operated switching device having a receiver for handling RF frequencies in a superheterodyne fashion without the need of local oscillators, or the like at the receiver. Input means is provided for receiving first and second RF frequencies having a predetermined frequency difference. The RF frequencies are FSK modulated simultaneously, one frequency increasing and the other decreasing, so that the frequency difference will produce a control signal at the output of an FM audio discriminator circuit. The control signal can be code modulated with series digital pulse information and applied to a code logic circuit that will detect if the proper code for the receiver has been received. If the proper code is received the logic circuit will energize an active control element such as a relay or the like to allow data to be transmitted back through the switching device.

REFERENCES:
patent: 3020398 (1962-02-01), Hyde
patent: 3076190 (1963-01-01), Shames et al.
patent: 3320535 (1967-05-01), Broadhead, Jr.
patent: 3571710 (1971-03-01), West
patent: 3786424 (1974-01-01), McVoy et al.
patent: 3794928 (1974-02-01), Stump et al.
patent: 3838343 (1974-09-01), Yactor
IRE Dictionary of Electronics Terms and Symbols, The Institute of Radio Engineers, Inc., 1961.

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