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Abstract

A speech synthesis system synthesizes a speech signal corresponding to an input speech signal based on a spectral envelope of the input speech signal. A glottal pulse generator generates a time series of glottal pulses, that are processed into a glottal pulse magnitude spectrum. A shaping circuit shapes the glottal pulse magnitude spectrum based on the spectral envelope and generates a shaped glottal pulse magnitude spectrum. A harmonic null adjustment circuit reduces harmonic nulls in the shaped glottal pulse magnitude spectrum and generates a null-adjusted synthesized speech spectrum. An inverse transform circuit generates a null-adjusted time-series speech signal. An overlap and add circuit synthesizes the speech signal based on the null-adjusted time-series speech signal.

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