Abstract
This paper describes the fundamental experiments for localization of a sound source using differences of microphones' output levels. A sensor tower is composed of four condenser microphones locating at vertices of a tetrapod. The tower can detect only the direction of the sound source, however two towers with a certain separation can localize the sound source. We made an experimental set and collected sound data for verifying the sound localization. The results show that the directional and positional errors of a sound source with the frequency 1[kHz] are less than 0.22[rad], 1.2[m] at the distances 3[m], 5[m], and 7[m], respectively.
