Patent ID: 8565446
Filing Date: 2013-10-22
Classification: H04R

Abstract:
1. A method for suppressing noise in a communication device having at least first and second microphones and a direction of arrival circuit coupled to the microphones, said method comprising the steps of: providing first and second variable gain circuits for the first microphone, the gain of the first and second variable gain circuits being adjustable, each of the first and second variable gain circuits providing an output; providing third and fourth variable gain circuits for the second microphone, the gain of the third and fourth variable gain circuits being adjustable, each of the third and fourth variable gain circuits providing an output; adjusting the gain of the first, second, third and fourth variable gain circuits based on data from the direction of arrival circuit, said adjusting step including the steps of: calibrating the first and third variable gain circuits during the presence of a desired signal; calibrating the second and fourth variable gain circuits during the presence of an interfering signal; and combining the outputs from the first, second, third and fourth variable gain circuits.