ACOUSTIC DEVICE

摘要

Provided is an acoustic device which does not increase noise even when a plurality of microphones collect sounds at an identical distance. Sound signals outputted from respective microphone arrays are phase-shifted by phase shift circuits (211A to 211H) and combined by an adder (212). The phase shift circuits (211A to 211H) perform phase shift in accordance with the installation positions of the respective microphone arrays. The phase shift circuits successively perform shifts in accordance with the rotation angle, starting with the phase shift circuit (211A) which performs a 0-degree shift, and then the phase shift circuit (211B) which performs a 45-degree shift, the phase shift circuit (211C) which performs a 90-degree shift and so on, up to the phase shift circuit (211H).