Evaluation of a glottal ARMA modeling scheme
Arthur P. Lobo, William A. Ainsworth · The Journal of the Acoustical Society of America · 1989
In many speech analysis/synthesis schemes, the source of excitation for voiced speech is a train of impulses. Although this is a mathematically sound scheme, there is no physiological basis for it. The quality of speech that has been attained due to the introduction of a dynamically varying source, e.g., a parametric source mode, multipulse excitation, etc., has been found to be better than that produced using impulse excitation. In this paper, a pitch synchronous glottal ARMA analysis/synthesis scheme is proposed. A parametric voice source model is discussed. The voice source and vocal tract parameters are simultaneously estimated. The AR and MA orders of the vocal tract model are variable and their values are decided every period depending on whether a resynthesis efficiency threshold is crossed during the analysis/synthesis procedure. This scheme is compared with two other schemes, viz., (1) closed phase LPC analysis/synthesis and (2) robust LPC analysis/synthesis. The superiority of the proposed scheme over the latter two methods is shown in terms of better formant/bandwidth tracking ability and efficiency of resynthesis.