Patent ID: 8315871

Claim:
A method to be executed in a computing device for performing speech synthesis, the method comprising: determining features as a result of analyzing text to be converted to speech; determining acoustic models from a Line Frequency Spectrum (LFS) waveform from the features, the acoustic model employing a Hidden Markov Model (HMM) algorithm and including a variance and a mean value for each segment of the waveform, wherein the LFS waveform is used to synthesize speech by enabling a synthesizer to generate different voices through multiple sets of stored segments, and wherein a start model and an end model are unstable; modifying the start and the end models such that they are stabilized by setting respective predefined co-variances for the start and the end models such that a segment of the LFS waveform in each model is near its mean value; smoothing the LFS waveform based on the setting of the predefined co-variances for generating the speech; generating the speech based on the smoothed LFS waveform.