Telephonic communications – Call signal generating
Patent
1997-09-17
1999-08-17
Isen, Forester W.
Telephonic communications
Call signal generating
379373, 379375, 84DIG11, H04M 302
Patent
active
059405015
ABSTRACT:
The present invention comprises a ringer interface circuit for generating a ringer signal for controlling a telephone ringer. The circuit of the present invention includes a first frequency divider, a second frequency divider, and a third frequency divider. The first frequency divider is adapted to receive a ringer clock signal and generate a first divider frequency output therefrom. The second frequency divider is coupled to receive the first divider frequency output and is adapted to generate a second divider frequency output using the first divider frequency output. The second frequency divider is further adapted to generate a oversampled audio frequency signal. The third frequency divider is coupled to receive the second frequency divider output and is adapted to generate a period signal using the second frequency divider output. The circuit of the present invention also includes a modulator coupled to receive the oversampled audio frequency signal from the second frequency divider and the period signal from the third frequency divider. The modulator is adapted to generate a ringer frequency output having a pulse width according to the oversampled audio frequency signal and a level setting and a period according to the period signal. The modulator is further adapted to output the ringer signal to control a telephone ringer.
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Gallegos Augusto
Silvestre Philippe
Isen Forester W.
Saint-Surin Jacques M.
VLSI Technology Inc.
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