Key telephone system multilink hands free answer circuit

Details Key telephone system multilink hands free answer circuit Key telephone system multilink hands free answer circuit

1977-03-04

1977-12-13

Claffy, Kathleen H.

179 1HF, 179 81B, H04M 100

Patent

active

040630471

ABSTRACT:
A multilink intercom is disclosed having hands free answer capability on each of the links. The circuit is arranged for use with the standard key telephone system and is station oriented such that concurrent hands free communication connections can be utilized on each of the links. A common selector is used to serve all of the links and the hands free detector and control circuitry at each station is shared among all of the intercom lines at that station.

REFERENCES:
patent: 3743791 (1973-07-01), Duff et al.
patent: 3787640 (1974-01-01), Bush
patent: 3860756 (1975-01-01), Shinoi
patent: 3872262 (1975-03-01), Kerman
patent: 3898392 (1975-08-01), Jackson
patent: 3904834 (1975-09-01), Shinoi
patent: 3976847 (1976-08-01), Bidlack et al.
patent: 3979563 (1976-09-01), Kita
patent: 4010332 (1977-03-01), Matheny

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