AC supervisory signal detector circuit

Details AC supervisory signal detector circuit AC supervisory signal detector circuit

1977-12-23

1979-01-09

Stellar, George G.

179 18FA, H04M 700

Patent

active

041339827

ABSTRACT:
An AC supervisory signal detector circuit for use in conjunction with a trunk circuit of a digital PABX telephone system interfacing with a central office providing for detection of relatively low frequency AC voltages which may be superimposed upon a DC bias voltage of either polarity. The circuit is equally responsive to various frequencies used in supervisory type signaling.

REFERENCES:
patent: 3766325 (1973-10-01), Hatfield et al.
patent: 3842216 (1974-10-01), Owen et al.
patent: 3875346 (1975-04-01), O'Dea et al.
patent: 4004106 (1977-01-01), Yachabach et al.
patent: 4046970 (1977-09-01), Castleman

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