BEAMFORMING PROCESSOR AND BEAMFORMING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a beamforming processor capable of suppressing increase in the amount of computation involved in the beamforming, when beamforming by collecting the sound of voice band, while enhancing the SN ratio and reducing degradation of sound quality.SOLUTION: Sound pickup signals Z1(n)-ZL(n) generated in microphones 401-1 through 401-L are subjected to Fourier transformation by conversion sections 402-1 through 402-L. A microphone interval information storage section 403 stores information representing the mutual interval of a plurality of microphones. A sound source distance information storage section 404 stores information representing the target sound distance of each microphone. By using the two types of information thus stored, a combination of microphones for use in the operation of each operating section 407-1 through 407-M is determined among the plurality of microphones, and the frequency range for every operation results of each operating section is determined, when performing synthesis in a synthesis section 408. An inverse transformation section 409 performs inverse Fourier transformation, and determines a signal Y(n) in the time domain.