Considerations on articulatory dynamics for continuous speech recognition

In this paper, a new method is proposed to eliminate coarticulation effect in articulatory domain. Since coarticulation phenomena are due to the physiological and physical processes of speech production, it is effective to consider articulatory dynamics using a suitable model. This method is to estimate motor command based on the modeling of the transfer function from the command of phonemic unit to the articulatory motion. If second order system is adopted as the model, it is shown that parameters of the dynamics satisfy a simple equation for wide variety of data. And an effective algorithm is proposed to get optimal phonemic commands under the assumption of the above dynamics. When this alogrithm is applied to the phoneme recognition in continuous speech, it is found that the command can be estimated successfully and a few percent higher recognition rate can be obtained compared with the result by our previous method.