Telephone set

Details Telephone set Telephone set

1986-03-24

1988-07-05

Ng, Jin F.

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

379424, H04M 900

Patent

active

047560215

ABSTRACT:
A telephone set which has a hands-free mode of operation is disclosed. The telephone set includes a telephone circuit connector to a handset and a hands-free circuit connected to a loudspeaker. A hook switch is mechanically operated in accordance with operation of the handset. A semiconductor switch is connected in parallel with the hook switch and is controlled by a control circuit. The telephone circuit or hands-free circuit is selectively connected to a pair of telephone lines through the hook switch or the semiconductor switch.

REFERENCES:
patent: 4068135 (1978-01-01), Sonobe et al.
patent: 4158112 (1979-06-01), Cerbone et al.
patent: 4365118 (1982-12-01), Lindman et al.
patent: 4496799 (1985-01-01), Kingen et al.
patent: 4497980 (1985-02-01), Gorman et al.
patent: 4550226 (1985-10-01), Teater
patent: 4608462 (1986-08-01), Blomely et al.
"Loudspeaker Equipment for Key Telephone", I. Yamagami et al., Japan Telecommunications Review, Jan. 1982, pp. 29-33.

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