P2D-2 Quantitative Estimation of Ultrasonic Multiple Access Method Based on M-Sequence Code

Abstract

Recently, we have proposed an ultrasonic multiple access method based on the spectrum spread technology using M-sequence codes. However, its effect depends on the preset threshold level. In this paper, we consider a novel quantitative estimation method using the normalized cross-correlation function between two microphones. Using this quantitative estimation method, we investigate the effect of the preset level and show the optimal value of the preset threshold.