Patent ID: 8311236

Claim:
A noise extraction device, comprising: first and second microphone units respectively located at spatially different positions and each configured to pick up a sound; a directivity synthesis unit configured to perform a directivity synthesis on output signals respectively received from said first and second microphone units, and generate two directionally synthesized signals which have: different sensitivities to noise; a same directional pattern with respect to sound pressure; and a same effective acoustic center position; and an acoustic cancellation unit configured to extract a noise component by cancelling an acoustic component of one of the two directionally synthesized signals by subtracting the one of the two directionally synthesized signals from another of the two directionally synthesized signals, wherein said directivity synthesis unit includes first, second, and third directivity synthesis units, each configured to perform the directivity synthesis on the output signals respectively received from said first and second microphone units, and wherein said acoustic cancellation unit includes a cancellation calculation unit configured to obtain the one of the two directionally synthesized signals from an output signal provided by said first directivity synthesis unit, generate the other of the two directionally synthesized signals using output signals respectively provided by said second and third directivity synthesis units, and cancel the acoustic component by subtracting the one of the two directionally synthesized signals from the other of the two directionally synthesized signals.