ACOUSTIC SIGNAL GENERATING APPARATUS AND METHOD

摘要

PROBLEM TO BE SOLVED: To obtain transient characteristics close to an ideal spherical wave at low costs by digital signal processing. SOLUTION: This acoustic signal generating apparatus is provided with a first speaker for generating a first acoustic signal; a second speaker for generating a second acoustic signal; a first calculation part for calculating the desired impulse response of a direct wave excluding any reverberation component; a second calculation part for calculating a control filter coefficient for acquiring a desired impulse response; a third calculation part for calculating delay quantity with which the transmission of sound from the first speaker and the transmission of sound from the second speaker satisfy causality; a delay part for processing the delay of the input signal; and a control filter part for operating the filter processing of the input signal by using the control filter coefficients. The first speaker generates a first acoustic signal according to the input signal delayed by the delay part, and the second speaker generates a second acoustic signal according to the input signal filtered by the control filter part. COPYRIGHT: (C)2009,JPO&INPIT