Input/output circuit for a communication device

Details Input/output circuit for a communication device Input/output circuit for a communication device

1996-12-16

2000-10-03

Isen, Forester W.

Telephonic communications

Substation or terminal circuitry

Conversion of signal form

379390, 379395, 381104, H04M 100

Patent

active

061283835

ABSTRACT:
In an input/output circuit of a communication device, such as network control unit of a facsimile machine or transmission/reception circuit of a telephone set, an amplification factor of an amplifier circuit is changed without replacing the circuit components. The amplifier circuit includes operational amplifiers which amplify an input signal from a telephone line and/or an output signal sent to the telephone line. A central processing unit is provided in conjunction with the amplifiers, which outputs a control signal to the amplification circuit so that the amplification factor of the operation amplifier is changed responsive to the control signal.

REFERENCES:
patent: 4146753 (1979-03-01), D'Arrigo et al.
patent: 4233474 (1980-11-01), Hishinuma et al.
patent: 4536888 (1985-08-01), Wilson
patent: 4718083 (1988-01-01), Boeckmann
patent: 4910768 (1990-03-01), Sues et al.
patent: 4918725 (1990-04-01), Takahashi
patent: 5133007 (1992-07-01), Nishimura
patent: 5410594 (1995-04-01), Maruyama
patent: 5555300 (1996-09-01), Gutzmer

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