1. A method for determining the mouth features for a speaking character, comprising the steps of: sampling a time-domain audio signal; separating the time-domain audio signal into a plurality of frames; applying a window to each of the plurality of frames; and applying a linear predictive coding (LPC) technique to each of the plurality of frames to achieve a plurality of LPC coefficients and a gain for each of the plurality of frames, whereby the LPC coefficients and gain for each frame are used to determine the mouth features for the character on a frame-by-frame basis.