Stereo interface telephone ring detector

Details Stereo interface telephone ring detector Stereo interface telephone ring detector

1981-10-13

1987-03-24

Psitos, Aristotelis M.

Telephonic communications

Composite substation or terminal

379373, H04M 1108

Patent

active

046530878

ABSTRACT:
A stereo interface telephone ring detector device is disclosed which generates a tone through a headphone set of a stereo unit in response to an incoming telephone signal to audibly alert a stereo listener of the presence of the telephone call. The incoming telephone signal is rectified and coupled to both tone generating means and switching means whereby the stereo signal to the headphone set is momentarily interrupted and substituted with a modulated tone signal.

REFERENCES:
patent: 1775567 (1930-09-01), Lewis
patent: 2766378 (1956-10-01), Sundin et al.
patent: 3446976 (1969-05-01), Shaw
patent: 3532823 (1970-10-01), Ellis
patent: 3867585 (1975-02-01), Morstadt
patent: 4099936 (1978-05-01), Tech
patent: 4243973 (1981-01-01), Sandidge
patent: 4338492 (1982-07-01), Snopko

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