Device for transmission of information by pulse code frequency s

Details Device for transmission of information by pulse code frequency s Device for transmission of information by pulse code frequency s

1975-08-13

1977-10-11

Griffin, Robert L.

Telegraphy

Systems

Printing

178 88, 325419, H04B 126, H04L 2714

Patent

active

040538362

ABSTRACT:
A device for transmission of information by pulse code frequency shift modulation. The device incorporates a phase-locked superheterodyne receiver including a single voltage controlled oscillator, and a demodulator including a phase comparator and a phase shifter. The intermediate frequency is equal to one half the input signal frequency shift. The comparator compares the phases of the intermediate frequency signal and of a signal of the same frequency derived from the voltage controlled oscillator to provide a message output.

REFERENCES:
patent: 2955199 (1960-10-01), Mindes
patent: 3032650 (1962-05-01), Mathison et al.
patent: 3163823 (1964-12-01), Kellis
patent: 3358240 (1967-12-01), McKay
patent: 3371281 (1968-02-01), Powell
patent: 3737578 (1973-06-01), Matsuo
patent: 3794928 (1974-02-01), Stump
patent: 3860874 (1975-01-01), Malone

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