Counter based ringer interface

DETAILED DESCRIPTION What is claimed is: 1.
A ringer interface circuit for generating a ringer signal to control a ringer in a telephone, comprising: a first frequency divider, said first frequency divider adapted to receive a ringer clock signal and generate a first frequency divider output therefrom; a second frequency divider coupled to receive said first frequency divider output, said second frequency divider adapted to generate a second frequency divider output using said first divider frequency output, said second frequency divider further adapted to generate a oversampled audio frequency signal; a third frequency divider coupled to receive said second frequency divider output, said third frequency divider adapted to generate a period signal using said second frequency divider output; and a modulator coupled to receive said oversampled audio frequency signal and said period signal, said modulator adapted to generate a ringer signal having a pulse width according to said oversampled audio frequency signal and a period according to said period signal, said modulator further adapted to output said ringer signal to control a telephone ringer.
2.
The ringer interface circuit of claim 1, further comprising: a first register included within said first frequency divider, said first register adapted to count said ringer clock signal to generate said first frequency divider output.
3.
The ringer interface circuit of claim 2 further comprising: a frequency input coupled to said first frequency divider and coupled to said first register, said frequency input adapted to load said first register with a divisor for generating said first frequency divider output.
4.
The ringer interface circuit of claim 1, further comprising: a second register included within said second frequency divider, said second register adapted to count said first frequency divider output to generate said second frequency divider output.
5.
The ringer interface circuit of claim 4, wherein the value of said second register is output by said second frequency divider as said oversampled audio frequency signal