METHOD AND APPARATUS FOR SYNCHRONIZING PHASES OF MICROPHONE RECEPTION SIGNALS IN MICROPHONE ARRAY

摘要

PROBLEM TO BE SOLVED: To provide a method and apparatus for synchronizing phases of microphone reception signals in a microphone array in which phases of reception signals in microphones constituting the microphone array can be highly accurately synchronized. SOLUTION: The apparatus for synchronizing phases of microphone reception signals in a microphone array including three or more microphones mounted in portable equipment and disposed on an xy-plane of a three-dimensional coordinate system with the portable equipment as a reference, includes a first means for calculating a coordinate estimate of a sound source in the three-dimensional coordinate system at predetermined time intervals and a second means for converting reception signals of the microphones into phase-synchronized signals based on the coordinate estimate of the sound source calculated by the first means, wherein the first means utilizes a natural gradient learning method to estimate coordinates of the sound source so as to minimize a difference of phase synchronized signals obtained by the second means. COPYRIGHT: (C)2005,JPO&NCIPI