Speaker telephone

Details Speaker telephone Speaker telephone

1976-01-29

1977-05-24

Claffy, Kathleen H.

179 1HF, 179 1A, H04M 160

Patent

active

040257282

ABSTRACT:
In this speaker telephone, the microphone and loudspeaker circuits both are connected directly to the telephone line, and both are normally disabled. Separate incoming and outgoing control circuits provide respective control signals that sequentially (1) disable the other control circuit and (2) enable the respective loudspeaker or microphone circuit. By use of the alternate, sequential disabling and enabling of the audio circuits and associated control circuits, sufficient isolation is obtained so that the loudspeaker and microphone can be mounted in the same housing.

REFERENCES:
patent: 3330912 (1967-07-01), Koseki
patent: 3562791 (1971-02-01), Baker
patent: 3660603 (1972-05-01), Anderson
patent: 3823273 (1974-07-01), Beeman
patent: 3889059 (1975-06-01), Thompson
patent: 3909548 (1975-09-01), Jacobson

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