Code and generating means for avionics communciations synthesize

Details Code and generating means for avionics communciations synthesize Code and generating means for avionics communciations synthesize

1975-01-23

1976-04-06

Safourek, Benedict V.

Oscillators

Relaxation oscillators

325184, 325421, 331 1A, H04B 138

Patent

active

039492966

ABSTRACT:
For use in a channel synthesizer utilizing a pulse swallowing phase locked loop, an eight bit code represents the megahertz component of the selected channel. An eight stage shift register is preloaded with the coded version of the selected megahertz component, and exclusive OR logic responsive selectively to the first, third, fifth, and eighth stages generates data for the first stage during the next shift. NAND logic responsive to the various stages detects presence of certain code combinations which are representative of terminal count states. Each terminal count pulse is utilized for comparison with the frequency reference in the phase locked loop, and also in a feedback arrangement to reset the registers to their preloaded states.

REFERENCES:
patent: 3673501 (1972-06-01), Zeph
patent: 3725791 (1973-04-01), Moreau et al.
patent: 3777278 (1973-12-01), Majeau et al.
patent: 3863224 (1975-01-01), Alexander

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