Telephone transmission circuit

Details Telephone transmission circuit Telephone transmission circuit

1981-03-12

1983-07-19

Miller, C. D.

H04M 160

Patent

active

043945422

ABSTRACT:
A telephone transmission circuit for connection to telephone line terminals includes a transmitter amplifier, a receiver amplifier and a balancing circuit for suppressing the leakage of the output of the transmitter amplifier to the receiver amplifier, the transmitter amplifier being connected to the line terminals so that a power supplied from the line is effectively used. Good impedance matching between the line and the telephone transmission circuit is achieved by the automatic adjustment of the balancing circuit responsive to the line length between the telephone transmission circuit and an exchange.

REFERENCES:
patent: 3748400 (1973-07-01), Ritz et al.
patent: 3825848 (1974-07-01), Sternbeck
patent: 4233474 (1980-11-01), Hishinuma et al.
patent: 4304969 (1981-12-01), Walla
Ericsson Review, No. 3, 1976, pp. 118-132, "Electronic Push-Button Telephone Set-Ericofon 700" by Boeryd et al.

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