Command signals generator circuit for telephonic fees indicators

Details Command signals generator circuit for telephonic fees indicators Command signals generator circuit for telephonic fees indicators

1997-08-29

1999-07-27

Isen, Forester W.

Telephonic communications

Supervisory or control line signaling

379124, 379399, 327337, H04M 300, H04M 1518

Patent

active

059303492

ABSTRACT:
The present invention relates to a control signal generation circuit for telephone charge indicators comprising a capacitor having a first and a second terminals connected to ground through respectively a first and a second switches with the first terminal of the capacitor being also connected through a third switch to a constant current generator which is connected to a positive power supply line with respect to ground. The second terminal of the capacitor is connected to a constant current generator which is connected to a negative power supply line with respect to ground. The first and second terminals are also connected through respectively a first and a second resistance to a circuit node coupled to an output terminal.

REFERENCES:
patent: 4211896 (1980-07-01), Ferrieu
patent: 4485270 (1984-11-01), Honda et al.
patent: 4638122 (1987-01-01), Siligoni et al.
patent: 4720852 (1988-01-01), Siligoni et al.
patent: 5172407 (1992-12-01), Alenius
patent: 5387874 (1995-02-01), Rapeli
patent: 5862213 (1999-01-01), Klamt et al.

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