Ringing generator

Details Ringing generator Ringing generator

1979-04-16

1980-09-02

Brigance, Gerald L.

179 84R, 179 18HB, H04M 500

Patent

active

042208262

ABSTRACT:
A ringing signal supply for supplying ringing current to a telephone line with high efficiency and minimum distortion. As the ringing current demand of a load increases, distortion of the output signal is produced which causes an error signal to be generated after comparison of the output signal waveshape with a reference waveshape. The error signal is used to change the duty cycle of a pulse signal from which the output ringing signal is produced, thereby maintaining the proper output signal waveshape.

REFERENCES:
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patent: 3492436 (1970-01-01), Feiner et al.
patent: 3653018 (1972-03-01), Budrys
patent: 3720793 (1973-03-01), Hofman
patent: 4001515 (1977-01-01), Zorzy
patent: 4001516 (1977-01-01), Weisigk et al.
patent: 4145577 (1979-03-01), Kojima et al.
patent: 4156150 (1979-05-01), Harrigan et al.

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