Digitally activated ringing circuit for generation of ac...

Details Digitally activated ringing circuit for generation of ac... Digitally activated ringing circuit for generation of ac...

H - Electricity

04

M

379/13

H04M 1/515 (2006.01) H04M 19/02 (2006.01)

Patent

CA 1145493

TITLE A DIGITALLY ACTIVATED RINGING CIRCUIT FOR GENERATION OF AC VOLTAGES ABSTRACT OF THE DISCLOSURE 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 repre- senting 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.

360645

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