To provide a sound source direction estimation apparatus capable of precisely estimating the direction of a sound source even there is a fluctuation with the sensitivity characteristics of a microphone.
A sound source direction estimation apparatus 20 allows audible and prescribed range of frequency components in each of the electric signals output by microphones 1 to 4 and amplified by amplifiers 5 to 8 to pass through each of BPF 21 to 24, and allows a sound source direction operation part 27 to estimate the direction of a sound source based on the frequency components passed through each of BPF 21 to 24. Then, the adjustment of amplification degree to reduce the difference of sensitivity characteristics of frequencies in the prescribed range is enabled by allowing an amplification adjustment part 26 to mutually adjust the amplification degree in generating frequency components from the electric signals with respect to each of the microphone 1 to 4, thereby gaining the frequency components with reduced sensitivity characteristics fluctuations for each of the microphones 1 to 4 for estimating the sound source direction precisely.
Yoshiki Kuroki
Yuji Suwa