Robust Inverse Filtering Using Smoothing Technique for Cross-Talk Cancellation in a Two-Channel Sound Image Projection System

Kiyoaki TERADA  Yoshinori TAKAHASHI  Hiroaki NOMURA  Mikio TOHYAMA 

Publication
A - Abstracts of IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences (Japanese Edition)  Vol.J90-A  No.3  pp.181-189
Publication Date: 2007/03/01
Online ISSN: 1881-0195
Print ISSN: 0913-5707
Type of Manuscript: PAPER
Category: 
Keyword: 
two-channel source image projection system,  inverse filter,  minimum-phase,  all-pass phase,  poles and zeros, 

Full Text(in Japanese): PDF(2.9MB)

Summary: 
This paper describes a robustness of a two-channel source image projection system based on complex smoothing technique that is extended for non-minimum-phase component. In multicahannel reproduction space, acoustic crosstalk cancellation is a essential system to make virtual sound images. Such a system, however, is sensitive to source/reciever position since the system is composed including inverse filter. We propose a method to modify the inverse filter by moving poles and zeros of the transfer function far from the unit circle in the z-plane. Exponential time-windowing moves the minimum-phase zeros, while the pole/zero symmetric location for the all-pass part can be controlled by windowing after causal and noncausal cepstrum decomposition. It is shown that this technique is more useful for a multichannel virtual source imaging system compared with traditional minimum-phase smoothing technique.