Patent ID: 6760449
Filing Date: 2004-07-06
Classification: H04R

Abstract:
A microphone array system comprising a plurality of microphones and a sound signal processing part,wherein at least three microphones are arranged on each spatial axis, and the sound signal processing part estimates a sound signal in an arbitrary position in a space by estimating a sound signal to be received at each axis component in the arbitrary position, utilizing a relationship between a difference, which is a gradient, between neighborhood points on a time axis of a sound pressure of a received sound signal of each microphone and a difference, which is a gradient, between neighborhood points on a spatial axis of an air particle velocity, and a relationship between a difference, which is a gradient, between neighborhood points on a spatial axis of the sound pressure and a difference, which is a gradient, between neighborhood points on a time axis of the air particle velocity, and based on a temporal variation of the sound pressure and a spatial variation of the air particle velocity of the received sound signal of each microphone arranged in each spatial axis direction; and synthesizing the estimated signals three-dimensionally.