A Practical Trial to Realize Active Noise Control System by a Fixed Point Processing Type DSP

Atsushi YAMAGUCHI  Hiroyuki FURUYA  Kensaku FUJII  Juro OHGA  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E80-A   No.5   pp.840-843
Publication Date: 1997/05/25
Online ISSN: 
Print ISSN: 0916-8508
Type of Manuscript: Special Section LETTER (Special Section on Acoustical Inverse Problems)
active noise control,  filtered-x algorithm,  'polarized-x' algorithm,  INLMS algorithm,  fixed point processing,  

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The filtered-x algorithm, which is widely applied to active noise control system, requires setting a small step gain. Such a small step gain reduces the noise reduction effect when the alogrithm is implemented by fixed point processing. This paper presents an experimental result that the 'polarized-g' individually normalized least mean square (INLMS) algorithm can provide almost the same noise reduction effect even in the fixed point processing of 16 bits as that in floating point processing.