SPEECH PROCESSING DEVICE, SPEECH PROCESSING METHOD, AND SPEECH PROCESSING PROGRAM

摘要

The purpose of the invention is to enable high-speed waveform generation while improving waveform reproducibility. A speech processing device according to an embodiment comprises a spectrum parameter calculation unit, a phase spectrum calculation unit, a group delay spectrum calculation unit, a band group delay parameter calculation unit, and a band group delay correction parameter calculation unit. The spectrum parameter calculation unit calculates a spectrum parameter. The phase spectrum calculation unit calculates a first phase spectrum. The group delay spectrum calculation unit calculates a group delay spectrum from the first phase spectrum on the basis of frequency components of the first phase spectrum. The band group delay parameter calculation unit calculates a band group delay parameter in a predetermined frequency band from the group delay spectrum. The band group delay correction parameter calculation unit calculates a band group delay correction parameter that corrects a difference between the first phase spectrum and a second phase spectrum reconstructed from the band group delay parameter.