Electronic telephone ringer including anti-bell tap provisions

Details Electronic telephone ringer including anti-bell tap provisions Electronic telephone ringer including anti-bell tap provisions

1980-09-17

1983-01-04

Popek, Joseph A.

H04M 100

Patent

active

043673767

ABSTRACT:
An electronic ringer circuit suitable for use as a replacement for, or an alternative to, the electromagnetic ringer of a telephone set and other station apparatus is disclosed. To eliminate bell tap, each of the disclosed arrangements includes a load impedance that is connected across the output terminals of a rectifier-power supply stage until an acceptable ringing signal is detected. The load impedance is then disconnected and the signal provided by the rectifierpower supply stage activates a tone generator stage that drives a piezoelectric transducer. Various arrangements are provided, including configurations for single-party bridged ringing installations, multi-party divided ringing installations, coded ringing for use in situations wherein a number of stations are located in the same acoustic environment, and a multi-line installation such as a small key telephone installation.

REFERENCES:
patent: Re28283 (1974-12-01), Cowpland et al.
patent: 3763326 (1973-10-01), Murto et al.
patent: 3965307 (1976-06-01), Dimmer
patent: 4214131 (1980-07-01), Bush et al.
patent: 4276448 (1981-06-01), Embree et al.

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