Method and apparatus for speech synthesis by wave form overlapping and adding

摘要

Speech is synthesised from elements such as diphones. At least the vocalized sounds of the sound elements are subjected to window analysis centred essentially on the start of each pulsed response of the vocal tract to the stimulation of the vocal cords, using a filtering window whose amplitude decreases to zero at the edges of the window and whose width is equal to at least twice the fundamental period of origin or twice the fundamental period of synthesis. The signals corresponding to each sound element which are obtained from the window analysis are replaced, the phase shift of the signals being equal to the fundamental period of synthesis, which is greater or less than the fundamental period of origin, depending on the prosodic data concerning the synthesis frequency. Synthesis is carried out by addition of the phase-shifted signals.