Ringer circuit

Details Ringer circuit Ringer circuit

1994-10-24

1996-06-11

Hofsass, Jeffery

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

379375, 379377, 379418, H04M 100

Patent

active

055264182

ABSTRACT:
A ringer circuit comprising a rectifier circuit, a voltage regulator and a ringer generation circuit is provided. The rectifier circuit generates a DC voltage signal at an output terminal and has an input terminal adapted to receive a ring input signal and a ground terminal. The voltage regulator generates a voltage signal, responsive to the DC voltage signal. The ringer generation circuit outputs a ring audio, responsive to the voltage signal. As a voltage level of the ring input signal exceeds a predetermined value, the voltage signal substantially equals to a fixed value, and as the voltage level of the ring input signal does not exceed the predetermined value, the voltage signal substantially equals to the DC voltage signal.

REFERENCES:
patent: 4309574 (1982-02-01), Sublette et al.
patent: 4658419 (1987-04-01), Denen

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