Ringing signal generator

Details Ringing signal generator Ringing signal generator

1989-08-21

1991-03-19

Dwyer, James L.

Telephonic communications

Call signal generating

379252, H04M 302

Patent

active

050017489

ABSTRACT:
A ringing signal generator includes a low power signal generator for generating a relatively low power signal representing a ringing signal, a bipolar pulse generator for generating a series of bipolar pulses having widths representing the amplitude of the low power signal, wherein adjoining pulses have opposite polarities, and a high power ringing signal generator for producing a high power ringing signal in response to the series of bipolar pulses. An analog sine wave signal is superimposed upon a DC bias signal to produce the low power signal.

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patent: 4656659 (1987-04-01), Chea, Jr.
patent: 4703500 (1987-10-01), Pollard
patent: 4734936 (1988-03-01), Tanaka et al.

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