Telephone ringer intensity control responsive to ambient noise

Details Telephone ringer intensity control responsive to ambient noise Telephone ringer intensity control responsive to ambient noise

1976-09-02

1978-02-28

Claffy, Kathleen H.

179 84T, H04M 126

Patent

active

040769682

ABSTRACT:
The loudness of a telephone set ringer is controlled by audible ambient noise in the vicinity of the telephone set to match the ringer intensity level to the ambient noise level. During an on-hook state of the telephone set, the transmitting microphone is utilized to detect the ambient noise which is then utilized to control the loudness of the ringer. In one illustrative embodiment, ring bursts which contribute to the ambient noise level cause build-up of ringer intensity starting at a level appropriate to the initial ambient noise level. In another embodiment, noise detection is terminated when the set is rung to maintain ringer intensity at the same level.

REFERENCES:
patent: 2428007 (1947-09-01), Boardman
patent: 2575990 (1951-11-01), Augustadt
patent: 3171901 (1965-03-01), Clemency
patent: 3290442 (1966-12-01), Suganuma
patent: 3387097 (1968-06-01), Beadle
patent: 3934084 (1976-01-01), Munson

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