Circuit for evaluating call signals in a telecommunication syste

Details Circuit for evaluating call signals in a telecommunication syste Circuit for evaluating call signals in a telecommunication syste

1986-02-05

1988-04-12

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

328138, H04M 100

Patent

active

047379871

ABSTRACT:
A simple and inexpensive circuit for evaluating the level and frequency ranges of call signals in a telecommunication system. For level evaluation the circuit comprises a pair of oppositely poled threshold value switches and an opto-coupler connected thereto. For frequency evaluation the circuit further comprises at least two series-arranged retriggerable monostable elements whose outputs are connected to a logic circuit. The dwell times of the monostable elements in response to an applied signal establish the frequency range within which a call signal can actuate the output of the logic circuit, thereby indicating whether the signal is within that range.

REFERENCES:
patent: 3146432 (1964-08-01), Johnson
patent: 3454720 (1969-07-01), Minchenko
patent: 3594588 (1971-07-01), Evans et al.
patent: 4066848 (1978-01-01), Darwood
patent: 4390843 (1983-06-01), Betts et al.
patent: 4427948 (1984-01-01), Rinaldi
patent: 4536618 (1985-08-01), Serrano

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