Ringing decoder circuit

Details Ringing decoder circuit Ringing decoder circuit

1979-12-06

1981-10-06

Brigance, Gerald L.

179 84R, 179 18HB, H04M 1300, H04M 302

Patent

active

042937370

ABSTRACT:
A telephone system automatic ringing code decoder useful to provide single party ringing on a multi-party telephone line. The decoder counts the number of ring bursts and detects the length of the last ring burst in the first ring burst code sequence and compares it with a preselected code. Upon finding a match, it provides an output on an SEL lead, indicating that further ringing can be applied to a subscriber's set ringer.

REFERENCES:
patent: 1942404 (1934-01-01), Ashbrook et al.
patent: 2862058 (1958-11-01), Nilsson et al.
patent: 3158837 (1964-11-01), Bodin et al.
patent: 3360777 (1967-12-01), Kolm
patent: 3689705 (1972-09-01), Pinede et al.
patent: 4146754 (1979-03-01), Rose

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