Distance Estimation Based on Interference of Audible Linear Chirp Signal

—Performance Evaluation in Noisy Environments and a Trial for Noise Reduction—

Abstract

The distance estimation method based on interference of linear chirp sound has been proposed. However, the measurement performance was degraded by additional noise. In this paper, we expand the method to a method that is robust to noisy environments by introducing a concept of synchronous addition and spectral subtraction. Finally, we confirm the validity and effectiveness of the expanded method through experiments.