Confirmation circuit for a two-way communication system

Details Confirmation circuit for a two-way communication system Confirmation circuit for a two-way communication system

1976-08-10

1978-05-30

Griffin, Robert L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

179 84VF, 325 55, 325 64, 340311, 343177, H04B 700

Patent

active

040925978

ABSTRACT:
A two-tone decoder decodes simultaneously at least two calling tones each having different frequencies coupled from a calling station to a called station and produces a first control signal upon cessation of the two calling tones. A timer responding to the first control signals produces a second control signal in the form of a pulse having a predetermined duration. A relay is activated by the second control signal and couples a confirmation tone to the calling station from a confirmation tone generator in the called station for the predetermined duration of the second control signal.

REFERENCES:
patent: 3192488 (1965-06-01), Faith et al.
patent: 3256517 (1966-06-01), Saltzberg et al.
patent: 3432773 (1969-03-01), Land et al.
patent: 3458664 (1969-07-01), Adlhoch et al.
patent: 3559100 (1971-01-01), Grib et al.
patent: 3581283 (1971-05-01), Reddel et al.
patent: 3710275 (1973-01-01), Tanaka et al.
patent: 3930127 (1975-12-01), Warren et al.
patent: 3971896 (1976-07-01), Sekiguchi
patent: 4000379 (1976-12-01), Cowpland
Signetics Corporation-"Linear Integrated Circuits"-copyright 1973, pp. 6-30 to 6-33, 6-49, 6-50, 6-80, 6-81.

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