Telephone system ring period detector

Details Telephone system ring period detector Telephone system ring period detector

1981-02-09

1983-06-28

Heyman, John S.

328111, 3281291, 179 1P, H03K 908

Patent

active

043908438

ABSTRACT:
An improved ring detector circuit is provided to discriminate between ring signals and low frequency dial signals. The circuit times the interval between pulses generated each time the incoming waveform exceeds a threshold and, if the interval is greater than 50 ms disables a ring detect circuit which is set by a pulse train, the interval between adjacent pulses of which is less than 50 ms. Pulses having a duration of less than 5 ms are eliminated to insure that chatter and sliver are not misconstrued as a ring signal.

REFERENCES:
patent: 3825842 (1974-07-01), Birchfield et al.
patent: 3958183 (1976-05-01), Schaefer
patent: 3999136 (1976-12-01), O'Berry et al.
patent: 4047114 (1977-09-01), Lane et al.
patent: 4232267 (1980-11-01), Hanajima et al.

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