Telephone ringing detector

Details Telephone ringing detector Telephone ringing detector

1988-12-13

1990-07-03

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

379201, H04M 100

Patent

active

049397753

ABSTRACT:
To accurately detect the short bursts of distinctive ringing signals within 100 milliseconds, a magnitude comparator produces a binary signal indicative of whether the instantaneous tip-ring voltage exceeds a predetermined magnitude. The binary signal is integrated over a predetermined period of time controlled by a timer. If the time integral is below a first predetermined value, the absence of ringing is detected; if above a second predetermined value, ringing is detected; if in between, the integrating interval is extended until the integral falls outside the two values.

REFERENCES:
patent: 3808379 (1974-04-01), Lind
patent: 3816669 (1974-06-01), Meri
patent: 4066848 (1978-01-01), Darwood
patent: 4117272 (1978-09-01), Ando
patent: 4390843 (1983-06-01), Betts et al.
patent: 4491691 (1985-01-01), Embree
patent: 4496798 (1985-01-01), Colardelle et al.

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