Compensated hybrid

Details Compensated hybrid Compensated hybrid

1994-07-05

1996-07-30

Hofsass, Jeffery

Telephonic communications

Subscriber line or transmission line interface

Hybrid circuit

379398, 379399, 379345, H04M 1900

Patent

active

055419909

ABSTRACT:
A hybrid circuit for coupling a modem to an external telephone line substantially compensates for and thereby cancels reflected echo. The hybrid includes a transformer coupled between the telephone line and the modem transceiver, which includes a transmitter and a receiver. A matching resistor connected between the transceiver transmitter and the transformer at a hybrid point presents a matching impedance to the telephone line impedance. A feedback network is implemented between the transceiver receiver and transmitter to feed back sufficient voltage into the receive line to cancel echo produced at the hybrid point.

REFERENCES:
patent: 4989243 (1991-01-01), Choi
patent: 5282157 (1994-01-01), Murphy et al.
patent: 5333192 (1994-07-01), McGinn

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