Telephonic communications – Line equalization or impedance matching
Patent
1991-02-28
1995-04-25
Dwyer, James L.
Telephonic communications
Line equalization or impedance matching
379413, 379344, 379338, 379402, 379403, H04B 303
Patent
active
054105943
ABSTRACT:
A transmission input/output device for signal transmission through a telephone line, with reduced power consumption, size, and cost. The device includes: a resistor, connected to the telephone line, for setting a signal input and output impedance; and a transmission control circuit for amplifying the transmission signals to be outputted to the telephone line, including: a variable resistor, connected in series with the resistor, for supplying voltages corresponding to the transmission signals to be outputted to the telephone line into the resistor according to changes of an impedance of the variable resistor; and an operational amplifier for controlling the changes of the impedance of the variable resistor by supplying an output according to the transmission signals to be outputted to the variable resistor.
REFERENCES:
patent: 4004102 (1977-01-01), Ott
patent: 4064377 (1977-12-01), Regan
patent: 4359609 (1982-11-01), Apfel
patent: 4567331 (1986-01-01), Martin
patent: 4604741 (1986-08-01), Borsellotti
patent: 4607141 (1986-08-01), Schorr
patent: 4609781 (1986-09-01), Gay
patent: 4796295 (1989-01-01), Gay et al.
patent: 4894864 (1990-01-01), Cook
patent: 4914693 (1990-04-01), Beck et al.
Fully Integrated Analog Telephone, E. Moons et al, IEEE Journal of Solid-State Circuits 24 (1989) Jun., No. 3, New York, U.S., pp. 681-685.
Dwyer James L.
Kabushiki Kaisha Toshiba
Shehata Magdy W.
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