Adaptive self-calibration of small microphone array by soundfield approximation and frequency domain magnitude equalization

摘要

Methods and apparatus for self-calibration of small-microphone arrays are described. In one embodiment, self-calibration is based upon a mathematical approximation for which a detected response by one microphone should approximately equal a combined response from plural microphones in the array. In a second embodiment, self-calibration is based upon matching gains in each of a plurality of Bark frequency bands, and applying the matched gains to frequency domain microphone signals such that the magnitude response of all the microphones in the array approximates an average magnitude response for the array. The methods and apparatus may be implemented in hearing aids or small audio devices and used to mitigate adverse aging and mechanical effects on acoustic performance of small-microphone arrays in these systems.

主权项

1. An adaptive self-calibrating small microphone array comprising:
a plurality of microphones disposed in a two-dimensional or three-dimensional configuration; a reference microphone; and a signal processor configured to
associate a respective delay to responses from the plurality of microphones based on a spatial relationship of a respective microphone to the reference microphone,combine the responses from the plurality of microphones to form a combined response based on the respective delay, wherein the combined response is a mathematical approximation to a reference response, andcompare the combined response to the reference response from the reference microphone.