Multifrequency signal receiver for use in telephone signaling sy

Details Multifrequency signal receiver for use in telephone signaling sy Multifrequency signal receiver for use in telephone signaling sy

1975-05-13

1977-01-18

Claffy, Kathleen H.

H04M 150

Patent

active

040041050

ABSTRACT:
A receiver well adapted for reception of, for example, multifrequency call signals from a pushbutton telephone and for delivery of corresponding outputs to an automatic switchboard or the like. The receiver includes bandpass filters connected to an input which is to be coupled to a telephone line or the like, each bandpass filter permitting the passage therethrough of an incoming signal of a preselected frequency only. Individually connected to the outputs of the bandpass filters are detector circuits which are associated with detector control means such that, during the detecting operation of any one detector circuit, the others are rendered unresponsive to other incoming signals or noise whose voltage is less than that of the signal supplied to the operating circuit. Outputs from the detector circuits are delivered through suitable output circuits to equipment connected in the succeeding stage of the receiver.

REFERENCES:
patent: 3701857 (1972-10-01), Usuda
patent: 3795775 (1974-03-01), Cowpland
patent: 3851112 (1974-11-01), Kusan
patent: 3875347 (1975-04-01), Alaily
patent: 3914557 (1975-10-01), O'Neill

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