Circuit arrangement for a selective signal receiver, particularl

Details Circuit arrangement for a selective signal receiver, particularl Circuit arrangement for a selective signal receiver, particularl

1974-08-15

1976-07-27

Claffy, Kathleen H.

H04M 150, H04Q 146

Patent

active

039718972

ABSTRACT:
Selective digital signal receiver wherein the time distances between zero crossings of the input voltage are measured with a counter. The zero-crossing counter is preceded by a circuit which, when a zero crossing occurs, is changed to the "on" state, resulting in a counting pulse for the counter, and remains in this state for a dwell time which is only little shorter than the signal-frequency half cycle. Thus, interference pulses can no longer invalidate the counting result of each signal-recognition operation.

REFERENCES:
patent: 3537001 (1970-10-01), Friend
patent: 3559080 (1971-01-01), Kobori
patent: 3790720 (1974-02-01), Schartmann
International Switching Symposium Record, June, 1972, pp. 434-441, "Digital Multifrequency Tone Receiver" by S. G. Pitroda.

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