Formant emphasis method and formant emphasis filter device

摘要

A formant emphasis method and device for emphasizing the formant as the spectral peak of an input speech signal and attenuating the spectral valley of the input speech signal, which uses a spectrum emphasis filter (21) for emphasizing the formant of the input speech signal and attenuating the valley of the input speech signal, a first-order variable characteristic filter (23) whose characteristic adaptively changes in accordance with the characteristic of the input speech signal, and a first-order fixed characteristic filter (24) for compensating a spectral tilt included in an output signal from the spectrum emphasis filter.