Voice quality conversion system

PROBLEM TO BE SOLVED: To provide a voice quality converting system in which voice quality of input voice signals is converted in near rear timing using signal processing technique. SOLUTION: A voice analysis section 1 extracts frequency spectrum of input voice signals and a voiced sound detecting section 2 conducts voiced sound discrimination. A fundamental frequency detecting section 3 detects the fundamental frequencies existed in the voiced interval that is discriminated to be voiced sound in the section 2. A fundamental frequency processing section 4 converts the fundamental frequencies detected by the section 3 into low frequencies. A sound source signal generating section 5 generates sound source signals based on the detection result of the section 2 to synthesize voices. A voice synthesizing section 7 synthesizes and outputs synthesized signals using the frequency spectrum, that is frequency shifted the frequency spectrum obtained in the section 1 into a lower frequency side by a frequency process controlling section 6, and the sound source signals outputted from the section 5.