Digitally activated ringing circuit for generation of AC voltage

Details Digitally activated ringing circuit for generation of AC voltage Digitally activated ringing circuit for generation of AC voltage

1979-09-24

1981-05-26

Brigance, Gerald L.

179 17E, H04M 302

Patent

active

042700280

ABSTRACT:
A digitally activated ringing circuit for use in conjunction with a central processing unit of an electronic telephone central office is connected between the central processing unit and a telephone subscriber via the central office switching network. The ringing circuit generates an analog signal representing a particular one of a plurality of possible ringing frequencies to be applied to the subscriber line. The instantaneous values of the ringing signal are approximated by information contained within a read only memory.

REFERENCES:
patent: 3941942 (1976-03-01), Nash
patent: 4045620 (1977-08-01), Westbrook
patent: 4174467 (1979-11-01), Ferrieu
patent: 4192007 (1980-03-01), Becker

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