Patent ID: 7203323
Filing Date: 2007-04-10
Classification: H04R

Abstract:
1. A computer-implemented process for self calibrating a plurality of audio sensors of a microphone array, wherein each sensor has a known location and generates a signal representing a channel of the array, said process comprising using a computer to perform the following process actions: inputting a set of substantially contemporaneous audio frames extracted from the signals generated by at least two sensors of the array and a direction of arrival (DOA) associated with the frame set; computing the energy of each frame; establishing an approximation function that characterizes the relationship between the locations of the sensors and their computed energy values and using the function to estimate the energy of each frame; and for each frame, computing an estimated gain that compensates for the difference between the computed energy of the frame and its estimated energy, and applying the gain to the next frame associated with the same audio sensor.