1983-02-28
1985-01-01
Rubinson, Gene Z.
179 84R, H04M 100
Patent
active
044916914
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 or alternatively from an external DC supply, the ringer uses a digital integration and detection arrangement for distinguishing between valid and invalid ringing signals. A distinctive ringing capability for the tone ringer is also available through the use of two oscillators which allow selection of four frequencies and four modulation rates.
REFERENCES:
patent: 3740490 (1973-06-01), McAlonie et al.
patent: 4276448 (1981-06-01), Embree et al.
patent: 4367376 (1983-01-01), Proctor et al.
Copending U.S. patent application by W. A. Burger-D. M. Embree-M. H. Singer-D. R. Vogelpohl, 1-1-2-3 filed concurrently with this application on Feb. 28, 1983.
Embree David M.
Goldthorp David C.
Longenecker Howard H.
Vogelpohl David R.
AT&T Bell Laboratories
Dwyer James L.
Rubinson Gene Z.
Williamson S. R.
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