Tone receiver

Details Tone receiver Tone receiver

H - Electricity

04

M

379/14, 344/3, 3

H04M 1/50 (2006.01) H04M 13/00 (2006.01)

Patent

CA 1045733

Abstract A tone receiver for connection to a telephone line at the station end for responding to a predetermine 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 predeter- mined 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.

260634

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