Ringing signal generator

Details Ringing signal generator Ringing signal generator

1979-03-01

1980-12-16

Cardillo, Jr., Raymond F.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

328 27, 340347AD, 179 2A, H04M 126

Patent

active

042399416

ABSTRACT:
A telephone ringing signal generator which produces a signal that can ring a plurality of connected ringers tuned to different frequencies. The ringing signal comprises sequentially varying frequencies and each ringer will ring in response to its particular frequency. A counter is used to define the duration of the ringing signal and enable each frequency sequentially. A variable sweep frequency oscillator is connected to the counter and generates a signal having a different frequency for each counter increment. A programmable filter shapes the signal into a sine wave which is amplified to ringing voltage levels by a ringing signal amplifier.

REFERENCES:
patent: 3657657 (1972-04-01), Jefferson
patent: 4025868 (1977-05-01), Miki et al.

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