Speech synthesizer and method for synthesizing speech for superposing and adding a waveform onto a waveform obtained by delaying a previously obtained waveform

摘要

A speech synthesizer includes a first indicator for indicating the amplitude of a waveform by using a random number, a second indicator for indicating the superposition period for waveforms by using a random number, a waveform generator for generating first and second waveforms having an amplitude indicated by the first indicator, and a waveform superposition device for synthesizing an unvoiced speech waveform by superposing the second waveform generated by the waveform generator onto a waveform obtained by delaying the first waveform by a superposition period indicated by the second indication means. The speech synthesizer is capable of making the frequency characteristic of unvoiced speech analogous to that of white noise, and generating synthesized speech which is natural and analogous to an actual human voice.