The degree calculation section which it calculates degree n of the filter factor decisive device and the local

摘要

PROBLEM TO BE SOLVED: To provide a filter coefficient calculation device which calculates a filter coefficient used by a local reproduction device which can set a plurality of listening regions, and the local reproduction device.;SOLUTION: A plurality of speakers are arranged separately on a spherical surface, with their sound releasing sides directed toward the outside. An order calculation unit calculates the order n' of a spherical harmonics function on the basis of order determination information as a value (n'kr₀) greater than a wave number k of an input signal, or the condition for a spherical evanescent wave to be generated, multiplied by a position radius r₀ of the speakers. Then, a filter coefficient calculation unit, accepting the position information of the speakers (r₀,θ_u,φ_v) and the order n' and a mode m' of the spherical harmonics function as its inputs, substitutes the position information of the speakers (r₀,θ_u,φ_v) and the order n' and the mode m' for the spherical harmonics function to calculate a filter coefficient.;COPYRIGHT: (C)2013,JPO&INPIT