Accession Number:

ADA459064

Title:

Real-valued Delayless Subband Affine Projection Algorithm for Acoustic Echo Cancellation

Descriptive Note:

Technical rept.

Corporate Author:

UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES CA IMMERSIVE AUDIO LABORATORY

Personal Author(s):

Report Date:

2006-01-01

Pagination or Media Count:

5.0

Abstract:

Acoustic Echo Cancellation AEC often involves adaptive filters with large numbers of taps, which results in poor performance in real-time applications. The utilization of Delayless Subband Adaptive Filter DSAF helps reduce computations and improve the overall performance. However, conventional oversampled subband adaptive filters mainly use DFT or GDFT based analysissynthesis filter banks and generate complex-valued subband signals. This is particularly inefficient when applying the Affine Projection Algorithm APA, a popular adaptive algorithm for AEC problem, to each subband. For APA implementation, real-valued signals show higher efficiency than complex signals. In this paper, we present a real-valued delayless subband APA and study both its computational complexity and performance on AEC problems. Compared to the complex valued approach, our method achieves a better performance with lower computational cost.

Subject Categories:

  • Electrical and Electronic Equipment
  • Numerical Mathematics
  • Miscellaneous Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE