Device for identifying line reversal/ringing signal of a telepho

Details Device for identifying line reversal/ringing signal of a telepho Device for identifying line reversal/ringing signal of a telepho

1997-12-01

1999-11-16

Eisenzopf, Reinhard J.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379372, H04M 100

Patent

active

059871202

ABSTRACT:
A device for identifying a line reversal signal and a ringing signal of a telephone set having a built-in ringing detection circuit includes a counter, a comparator and a latch connected with each other in series. The device can determine whether a signal on line is the line reversal signal or the ringing signal of the telephone set without using an installed CPU or a timer thereof, so as to save power and reduce the load of the CPU.

REFERENCES:
patent: 4110569 (1978-08-01), Schindler et al.
patent: 4122308 (1978-10-01), Weinberger et al.
patent: 4354264 (1982-10-01), Wurst
patent: 4429185 (1984-01-01), Adrian et al.
patent: 4524245 (1985-06-01), Littlefield
patent: 4698840 (1987-10-01), Dively et al.
patent: 4768227 (1988-08-01), Dively et al.

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