ACOUSTIC REPRODUCTION METHOD AND APPARATUS THEREOF AND ULTRASONIC WAVE GENERATION PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide an acoustic reproduction method and an acoustic reproduction apparatus for reproducing audible sounds by generating signals that are equivalent to ultrasonic signals that are subjected to amplitude modulation by the audible signals by a computer, and to provide an ultrasonic wave generation program. SOLUTION: Audible sounds are oversampled at a sampling frequency that is at least two integer multiples of the upper-limit frequency of the audible sounds, at least one portion of samples that are not in the audible signals and are newly added is substituted with zero values to generate aliasing, and an electroacoustic conversion section is driven by signals including the aliasing components to generate ultrasonic waves.