Voice synthesis utilizing multi-level filter excitation

Abstract From the Canadian patent

Abstract, An improved speech analysis and synthesis system where pitch information for excitation is transmitted during voice segments of speech and pulse excitation or noise excitation is transmitted during unvoiced speech segments along with linear predictive coding (LPC) parameters. The decision of whether to transmit noise excitation or pulse excitation is performed by comparing the variance of the residual to the square of the mean amplitude of the rectified residual for each frame. If the result of this comparison is greater than a threshold value pulse, excitation is utilized otherwise noise excitation is used. The pulse excitation comprises a subset of samples of the LPC residual as …