Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent
1993-11-01
1996-08-13
Hofsass, Jeffery
Telephonic communications
Subscriber line or transmission line interface
Network interface device
379410, 379406, 379416, 370 321, H04M 908
Patent
active
055464599
ABSTRACT:
An apparatus that automatically adjusts the adaptation block size for a least-mean square (LMS) adaptive filter depending on the input signal-to-noise ratio (SNR) is disclosed. The apparatus monitors the instantaneous SNR and continually adjusts the block size to provide high noise immunity, thereby increasing the convergence speed of the filter and decreasing the asymptotic mean-square error. An exemplary embodiment of the present invention is presented in the context of acoustic echo cancellation, though it is noted that the adaptive filter of the present invention is useful in any environment in which the noise characteristics are subject to change.
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Antonio Franklin P.
Sih Gilbert C.
English Sean
Hofsass Jeffery
Hunter Daniel S.
Miller Russell B.
Qualcomm Incorporated
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