Ring detector circuit for centrally located answering and record

Details Ring detector circuit for centrally located answering and record Ring detector circuit for centrally located answering and record

1975-06-20

1977-09-20

Konick, Bernard

179 6E, 179 84R, H04M 164

Patent

active

040499162

ABSTRACT:
A telephone answering and recording system designed for installation in a centralized location remote from the customer's premises. A single line is employed in normal operation between the customer's telephone equipment and the centrally located answering and recording equipment. Facilities are also included which permit the customer to access the equipment from telephones other than his own regular instrument. The telephone answering and recording equipment includes a ringing signal detection means comprising an optical isolator, a comparator, and a counting means.

REFERENCES:
patent: 3141931 (1964-07-01), Zarouni
patent: 3702904 (1972-11-01), Bard
patent: 3838219 (1974-09-01), Mason
patent: 3842216 (1974-10-01), Owen
patent: 3865986 (1975-02-01), Darwood
patent: 3875348 (1975-04-01), Kopec
patent: 3965304 (1976-06-01), Marheine
patent: 3979560 (1976-09-01), Darwood

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