Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent
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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Allie Mark C.
Eriksson Larry J.
Dwyer James L.
Nelson Industries Inc.
Shehata M.
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