Plural frequency signalling systems

Details Plural frequency signalling systems Plural frequency signalling systems

1975-12-29

1977-08-23

Murray, Richard

Telegraphy

Code transmitters

Rotary contact

325320, H04L 2714

Patent

active

040442020

ABSTRACT:
A receiver for use in a signalling system of the kind in which data is conveyed by transmitting a signal having alternately first and second frequencies. The receiver has circuitry for providing in response to the received signal two trains of pulses with frequencies corresponding to that of the received signal. The trains of pulses are fed to delay and coincidence detecting circuits which are so arranged that a first coincidence gate circuit produces an output only when the received signal has its first frequency and a second coincidence gate circuit produces an output only when the received signal has its second frequency.

REFERENCES:
patent: 3233181 (1966-02-01), Calfee
patent: 3348153 (1967-10-01), Featherston

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