Spatial localization of intermittent noise sources by acoustic antennae

摘要

A noise source localization process that uses as few as four microphones in an antenna array. The process combines different averaging to the information from the various signals with non-linear (wavelet-based) filtering, cross-correlation and triangulation to more particularly locate a noise source relative to a target point. The process calculates a propagation time based on the distance from a target to each microphones, delays each of the signals according to the propagation time from the target, calculates a continuous wavelet transform for each of the signals to band-pass filter each of the signals according to a predetermined frequency of interest, determines the product of each pair of signals to produce correlation fringes, and locates the noise source based on the product of the pairs of signals.

主权项

1. A method of localizing a noise source, comprising the steps of:
obtaining at least four acoustic signals, each of which is provided by a separate microphone; selecting a target and calculating the distance from said target to each of said microphones; delaying each of said signals according to a propagation time delay from said target based on said distance; calculating a continuous wavelet transform for each of said signal to band-pass filter each of said signals according to a predetermined frequency of interest; determining the product of each pair of said signals to produce correlation fringes; calculating the local average of said fringes; concluding that said noise source is at said target if the peak of the average correlation occurs for zero additional delay relative to the propagation time delay.