Linearization Ability Evaluation for Loudspeaker Systems Using Dynamic Distortion Measurement

Shoichi KITAGAWA  Yoshinobu KAJIKAWA  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E94-A   No.2   pp.813-816
Publication Date: 2011/02/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E94.A.813
Print ISSN: 0916-8508
Type of Manuscript: LETTER
Category: Engineering Acoustics
Keyword: 
loudspeaker system,  dynamic distortion method,  Volterra filter,  Mirror filter,  linearization,  

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Summary: 
In this letter, the compensation ability of nonlinear distortions for loudspeaker systems is demonstrated using dynamic distortion measurement. Two linearization methods using a Volterra filter and a Mirror filter are compared. The conventional evaluation utilizes swept multi-sinusoidal waves. However, it is unsatisfactory because wideband signals such as those of music and voices are usually applied to loudspeaker systems. Hence, the authours use dynamic distortion measurement employing a white noise. Experimental results show that the two linearization methods can effectively reduce nonlinear distortions for wideband signals.