Electronic tone ringer

Details Electronic tone ringer Electronic tone ringer

1979-08-20

1981-06-30

Popek, Joseph A.

H04M 100

Patent

active

042764483

ABSTRACT:
An electronic tone ringer responds to ringing signals on a telephone line while being unresponsive to dialing pulses or other signals on the line. Powered directly from the telephone line the ringer uses current sources (223-226) to provide a high impedance to the ringer circuitry and an insensitivity to line voltage variations so that reliable operation of the ringer is maintained on long loops and with multiple ringers terminated on the line. A multitone signal for activating an electroacoustic transducer (300) is provided by frequency modulating a single oscillator (500) within the tone ringer.

REFERENCES:
patent: 3740490 (1973-06-01), McAlonie et al.
patent: 3808379 (1974-04-01), Lind
patent: 3860764 (1975-01-01), Martin et al.
patent: 3867585 (1975-02-01), Morstadt
patent: 3965307 (1976-06-01), Dimmer
patent: 4081617 (1978-03-01), Clark
patent: 4139740 (1979-02-01), Castleman

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