Ringing signal generator

Details Ringing signal generator Ringing signal generator

1983-10-26

1986-04-22

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

179 18HB, 179 84T, H04Q 900, H04M 302, H04M 100

Patent

active

045845760

ABSTRACT:
D.C.-fed ringing signal generator for a group of subscriber lines comprises a cascade arrangement of a digital signal generator controllable by a control signal to produce a signal corresponding either to the ringing signal or to a signal having zero value,

REFERENCES:
patent: 3767857 (1973-10-01), Colas et al.
patent: 4270028 (1981-05-01), Young
patent: 4310728 (1982-01-01), Dumont
patent: 4370526 (1983-01-01), Schoofs et al.
patent: 4406004 (1983-09-01), Hall et al.

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