Patent Document ID: 10154342
Application ID: 15360838
Patent Flag: 1

Claim One:
1. A spatial adaptation method for providing long term symmetry among a plurality of microphones of a device, comprising: calculating a magnitude ratio (MR) by computing a ratio between a first energy representing first group of one or more near-field microphones and a second energy representing a second group of one or more far-field microphones; using the MR to provide microphone matching of large variations without any situational assumptions to lower manufacturing cost and complexities, wherein the microphone matching depends on a difference between a near-field signal and a far-field signal; and in accordance with the microphone matching, adjusting the first group of one or more near-field microphones and the second group of one or more far-field microphones to have similar performance characteristics, wherein the step of calculating the magnitude ratio further comprises: calculating a minima follower and a maxima follower configured to track a minimum magnitude ratio and a maximum magnitude ratio over time, applied separately and independently in each frequency band of a plurality of frequency bands; and calculating an average magnitude ratio based on the minima follower and the maxima follower, wherein a buffer stores the minimum magnitude ratio and the maximum magnitude ratio over time, and wherein the average magnitude ratio is used to provide the microphone matching.