Ringing signal generator for a subscriber telephone set

Details Ringing signal generator for a subscriber telephone set Ringing signal generator for a subscriber telephone set

1984-07-19

1986-06-17

Dwyer, James L.

H04M 322

Patent

active

045957975

ABSTRACT:
A ringing signal generator for a subscriber telephone set comprising a switch switching the input signal, followed by a phase shifter and two symmetrical amplifiers having a very high output impedance at rest. The lines are driven through isolating capacitors.

REFERENCES:
patent: 4211896 (1980-07-01), Ferrieu
patent: 4239935 (1980-12-01), Bosik
patent: 4306118 (1981-12-01), Ciboulet et al.
patent: 4370526 (1983-01-01), Schoofs et al.
Patents Abstracts of Japan, vol. 7, No. 40, (E-159) (1185), Feb. 17, 1983 & JP-A-57 190 449 (Fujitsu K.K.) (24-11-1982).

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