SOUND SIGNAL ENHANCEMENT DEVICE, SOUND SIGNAL ENHANCEMENT METHOD, AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To enhance a specific sound by subjecting digital sound signals of a plurality of channels in unknown observation positions to signal block classification based on sound source positions.SOLUTION: The magnitude of a digital sound signal in a sound block is normalized by the magnitude of a digital sound signal in a non-sound block to obtain a feature quantity for each channel, and a feature quantity string comprising feature quantities obtained for a plurality of channels is clustered, and a signal block classification to which the feature quantity string belongs is determined. Digital sound signals are converted to frequency domains in a plurality of time blocks to obtain a plurality of amplitude spectra and a phase spectrum. Further, processing of enhancing an amplitude spectrum corresponding to a feature quantity string belonging to an enhancement signal block classification being one of signal block classifications, out of the plurality of amplitude spectra is performed, and the phase spectrum is given to the amplitude spectrum after the processing to obtain a complex spectrum.