Arrangement determination method reflector in the filter design, device, program

PROBLEM TO BE SOLVED: To provide technology for determining the placement of a reflection object which reflects voices in designing a filter adopted for voice based information. SOLUTION: In cases where a filter adopted for voice based information is designed on the basis of a prescribed evaluation function by using a spatial correlation matrix expressed by transfer characteristics in plural directions in space, the transfer characteristics each are expressed by the sum of the transfer characteristic of a direct sound and each transfer characteristic of one reflection sound reflecting at a reflection object, and the evaluation function is such a function that the more a voice in at least a target direction is emphasized, the smaller the value it takes. A storage unit has stored therein candidates for the placement of the reflection object for a microphone array or a speaker array. A placement determination unit calculates the values of the evaluation function using a spatial correlation matrix expressed by transfer characteristics determined by the candidate, and determines a candidate for placement corresponding to the smallest of those values as the placement of the reflection object. COPYRIGHT: (C)2013,JPO&INPIT