Communication system with active noise cancellation

Details Communication system with active noise cancellation Communication system with active noise cancellation

1989-07-31

1991-07-16

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379388, 379392, 381 71, 381 94, H04B 323, H04B 1500

Patent

active

050330829

ABSTRACT:
An active acoustic attenuation system (10) is provided with various adaptive filter models (40, 48, 56, 70, 84, 100) enabling communication between persons (26, 30) in spaced zones (12, 16) by selectively cancelling undesired noise and undesired speech, all on an on-line basis without dedicated off-line pretraining and also for both broadband and narrowband noise.

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"Adaptive Noise Cancelling: Principles and Applications", Widrow et al, Dec. 1975, IEEE.

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