EURASIP Journal on Advances in Signal Processing 
Volume 2007 (2007), Article ID 71948, 9 pages
doi:10.1155/2007/71948
Research Article

Subband Approach to Bandlimited Crosstalk Cancellation System in Spatial Sound Reproduction

Mingsian R. Bai and Chih-Chung Lee

 Department of Mechanical Engineering, National Chiao-Tung University, 1001 Ta-Hsueh Road, Hsin-Chu 300, Taiwan
Received 27 December 2005; Revised 1 May 2006; Accepted 16 July 2006

Recommended by Yuan-Pei Lin

Abstract

Crosstalk cancellation system (CCS) plays a vital role in spatial sound reproduction using multichannel loudspeakers. However, this technique is still not of full-blown use in practical applications due to heavy computation loading. To reduce the computation loading, a bandlimited CCS is presented in this paper on the basis of subband filtering approach. A pseudoquadrature mirror filter (QMF) bank is employed in the implementation of CCS filters which are bandlimited to 6 kHz, where human's localization is the most sensitive. In addition, a frequency-dependent regularization scheme is adopted in designing the CCS inverse filters. To justify the proposed system, subjective listening experiments were undertaken in an anechoic room. The experiments include two parts: the source localization test and the sound quality test. Analysis of variance (ANOVA) is applied to process the data and assess statistical significance of subjective experiments. The results indicate that the bandlimited CCS performed comparably well as the fullband CCS, whereas the computation loading was reduced by approximately eighty percent.