METHOD FOR SEQUENTIAL CORRECTION IN MICROPHONE ARRAY COORDINATE SYSTEM, METHOD AND EQUIPMENT FOR CORRECTING MICROPHONE RECEPTION SIGNAL IN MICROPHONE ARRAY

摘要

PROBLEM TO BE SOLVED: To provide a correction method of a microphone reception signal in a microphone array, enabling conversion of a signal received from each microphone, constituting a microphone array to signals which have no differences in the delay time between each other. SOLUTION: In the correction method of the microphone reception signal in the microphone array, having no less than three microphones mounted on portable equipment and disposed at an equal distance from the origin on the xy plane of a three-dimensional space referenced from the portable equipment, the method includes a step of calculating the angle rotated about the x-axis and the rotation angle about the y-axis on a basis of a predetermined period, when the microphone array coordinate system is rotated about the x-axis and the y-axis so that the delay time difference of the object sound source signal reaching each microphone becomes zero; and a step of converting each microphone reception signal into a signal having no delay time difference, based on the rotation angle around the x-axis and the rotation angle around the y-axis calculated above. COPYRIGHT: (C)2004,JPO