Common control digital echo suppressor

Details Common control digital echo suppressor Common control digital echo suppressor

1975-12-10

1977-06-14

Claffy, Kathleen H.

1791706, H04B 320

Patent

active

040299120

ABSTRACT:
A common control digital echo suppressor is disclosed which is configurable as full or split selectively on a channel-by-channel basis. Improved break-in and reduced hangover are provided by an arrangement for approximating the anticipated echo signals more accurately and by a wait-window technique to better distinguish between impulse noise and speech for break-in. The echo signal arrangement accurately approximates anticipated echo during both the rising and falling portions of speech signals. The wait-window technique provides for substantially instantaneous break-in, then a short wait period for impulse noise to subside, followed by a speech sampling window. If outgoing signals are detected during the window, suppression removal goes into a full break-in state. Otherwise, suppression is reinserted at the end of the window.

REFERENCES:
patent: 3562448 (1971-02-01), May
patent: 3673355 (1972-06-01), LaMarche et al.
patent: 3706091 (1972-12-01), May
patent: 3823275 (1974-07-01), LaMarche et al.
patent: 3896273 (1975-07-01), Fariello

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