Tone receiver

Details Tone receiver Tone receiver

1975-05-23

1976-11-23

Claffy, Kathleen H.

179 2A, H04M 150

Patent

active

039938751

ABSTRACT:
A tone receiver for connection to a telephone line at the station end for responding to a predetermined tone frequency in which the receiver has a multiple frequency selectable channel for allowing the receiver to respond to only one of a plurality of input tone frequencies. Circuit means are provided for comparing the input tone frequency with the output of the selected frequency for insuring that the receiver is responsive to only a predetermined input frequency. A programming circuit is provided for allowing the receiver to sample the input tone frequency only during a predetermined time interval. Storage means are connected to and actuate the receiver output when a predetermined number of comparisons have been counted between the input tone frequency and the selected frequency of the receiver.

REFERENCES:
patent: 3537001 (1970-10-01), Friend
patent: 3760269 (1973-09-01), Beeman
patent: 3790720 (1974-02-01), Schartmann
patent: 3912869 (1975-10-01), Ullakko
patent: 3917912 (1975-11-01), Niwa

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