Hands-free device for use with a cellular telephone in a car to

Details Hands-free device for use with a cellular telephone in a car to Hands-free device for use with a cellular telephone in a car to

1996-11-12

1998-09-01

Zele, Krista

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

379420, 455 90, 455569, H04M 900

Patent

active

058021671

ABSTRACT:
A hands-free device is adapted for use with a cellular telephone in a car to permit hands-free operation of the cellular telephone, and includes a main terminal, a secondary terminal, and a microphone provided on one of the main and secondary terminals. The main terminal includes a first casing, a power supplying unit, a voltage regulating circuit, a first connector, an audio output amplifier circuit, and a sound output unit. The secondary terminal includes a second casing, a second connector connected removably to the first connector, a third connector connected removably to the cellular telephone, a hands-free control circuit, a voltage output control circuit, and a gain control circuit. The secondary terminal can be replaced so that the hands-free device can be used with any type of cellular telephone without changing the main terminal.

REFERENCES:
patent: 4636741 (1987-01-01), Mitzlaff
patent: 4745632 (1988-05-01), Duffy
patent: 4811390 (1989-03-01), Garabedian et al.
patent: 4905270 (1990-02-01), Ono
patent: 5291147 (1994-03-01), Muurinen
patent: 5303395 (1994-04-01), Dayani
patent: 5333176 (1994-07-01), Burke et al.
patent: 5367556 (1994-11-01), Marui et al.
patent: 5444867 (1995-08-01), Marui et al.
patent: 5493703 (1996-02-01), Yamashita
patent: 5524044 (1996-06-01), Takeda
patent: 5584052 (1996-12-01), Gulau et al.
patent: 5590414 (1996-12-01), Marui et al.

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