Abstract
An investigation of the first derivative of instantaneous speech power at any point in the spectrum was made by first assuming that the total energy variance is produced by two components: the amplitude modulation of the excitation wave and the movement of the formants. It was found that the effect of the amplitude-modulation component is to produce a uniform first derivative of power over the entire speech spectrum. The maximum rate of change produced by this component is 12 the fundamental pitch of the speaker. The change produced by the formant-movement component, however, does not exhibit a uniform rate of power change over the speech spectrum. Rather, it was found to fall off at the high and low end of the spectrum by more than 3 to 1 and attained a maximum rate of change, at 1000 cps, which was less than 13 that of the amplitude-modulation component. These studies were performed by using test sentences obtained from 5 male and 5 female speakers. No significant difference was found between male and female. [Work supported in part by the U. S. Air Force under contract No. AF19(628)-586.]
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