Echo suppressor with SF transmission and regeneration

Details Echo suppressor with SF transmission and regeneration Echo suppressor with SF transmission and regeneration

1977-04-29

1978-09-19

Claffy, Kathleen H.

H04B 320

Patent

active

041156684

ABSTRACT:
An interface unit for a four wire telephone circuit includes an echo suppressor. A filter circuit is connected to the transmit line drop side to detect voice and SF signals and to selectively couple a regenerated SF signal and the voice signal to the line side of the transmit line. A passive filter is selectively coupled to the receive side to attentuate voice echo but bypass SF signals.

REFERENCES:
patent: 3562439 (1971-02-01), Lugten
patent: 3725612 (1973-04-01), Campanella et al.
patent: 3769466 (1973-10-01), Von Pfeil et al.
patent: 3937907 (1976-02-01), Campanella et al.

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