Formant emphasis method and formant emphasis filter device

摘要

In a formant emphasis method of emphasizing the formant as the spectral peak of an input speech signal and attenuating the spectral valley of the input speech signal, a spectrum emphasis filter performs processing for emphasizing the formant of the input speech signal and attenuating the valley of the input speech signal. A first-order variable characteristic filter whose characteristic adaptively changes in accordance with the characteristic of the input speech signal and a first- order fixed characteristic filter compensate a spectral tilt included in an output signal from the spectrum emphasis filter.