Temporal energy contour in isolated word recognition

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Abstract
An analysis of recognition errors in a speaker-independent digit recognition experiment has demonstrated that the temporal energy contour of the teat tokens is an important feature for recognition and perception. This finding supports the conclusions of other recent studies [Rabiner et al., Proc. ICASSP 17.1.1 (1984)], [Rabiner et al., J. Acoust. Soc. Am. Suppl. 1 75, S93 (1984)]. A conventional LPC analysis with a likelihood ratio distance measure and dynamic time warping was used. This recognizer ignores the temporal energy contour. To help us understand the nature of the recognition errors, we played the test tokens through an LPG synthesizer after time alignment with the correct and with the successful (but incorrect) reference templates. Examples on tape demonstrate that the percept of either the correct or of the successful reference word can be evoked by replacing the input energy contour with the reference energy contour.

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