Ring trip circuit

Details Ring trip circuit Ring trip circuit

1993-03-19

1994-03-08

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379252, 379253, 379255, 379254, H04M 300

Patent

active

052934209

ABSTRACT:
A first part for picking up a signal being proportional to a ringing tone signal transferred on a subscriber line; a second part for extracting an ac component from the thus picked-up signal; and a third part for receiving both the signals from the first and second parts and comparing, in level, these two signals to produce a ringer stop signal if the level difference therebetween becomes larger than a setpoint value, and thus, a conventional low-pass filter can be removed.

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