Patent ID: 8218787

Claim:
A microphone array signal processing apparatus comprising: delay devices that add delays to respective ones of a plurality of sound signals output from respective ones of a plurality of microphones constituting a microphone array; an adder that sums the plurality of sound signals with the respective delays added thereto; a detecting device that detects a harmonic structure of sound included in the sound signal; a determining device coupled to the adder and to the detecting device that determines a direction of a sound source; and a filter device that selectively passes predetermined frequency components based upon the detected harmonic structure of sound including the sound signal coming from the sound source in the direction determined by said determining device, wherein said determining device determines the direction of the sound source by comparing frequency response before delay-and-sum processing performed by said delay devices and said adder with frequency response after the delay-and-sum processing, only with respect to positions of overtones constituting one harmonic structure.