Echo controller comprising a mode switch for switching echo supp

Details Echo controller comprising a mode switch for switching echo supp Echo controller comprising a mode switch for switching echo supp

1975-09-04

1977-01-25

Cooper, William C.

1791706, H04B 320

Patent

active

040052770

ABSTRACT:
An echo controller comprises a parallel circuit of an echo suppressor and a self-adaptive echo canceller near an echo path of a long-distance telephone network. The echo controller further comprises a mode switch responsive to levels of a received signal, an unprocessed signal, and an output signal of the echo canceller and operable during absence of double talk for suspending operation of the echo canceller and putting instead the echo suppressor into operation only when characteristics of the echo path and operation of the echo canceller are objectionable.

REFERENCES:
patent: 3508017 (1970-04-01), Unrue, Jr.
patent: 3754105 (1973-08-01), Poschenrieder et al.
patent: 3894200 (1975-07-01), Campanella et al.

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