DEVICE AND METHOD FOR EXPANDING VOICE BAND

摘要

PURPOSE: To generate a wide band synthetic voice having high articulation using an extracted spectrum envelope and a sound source having a wide band pulse train from a narrow band voice signal. CONSTITUTION: An input signal is stored in a buffer 101 for a fixed time, feature quantity relating to a spectrum envelope is extracted for a signal train stored in the buffer by an analyzing section 102. By using this feature quantity, a sound source pulse train generating section 13 estimates a sound source pulse train for a signal of the buffer 101, and restores an omitted band using an estimated pitch period. An output voice synthesizing section 14 synthesizes voice by weighing frequency in which voice is omitted from the sound source pulse train and the spectrum envelope. Thereby, a voice band can be expanded for a voice signal in which a band is omitted with comparatively simple constitution.