Experiments in isolated digit recognition with a cochlear model

We have conducted speaker-independent isolated digit recognition experiments using vector quantized cochleagrams. Without the use of time order information, we were able to achieve a recognition rate of 97.24%. With a modified Viterbi algorithm we achieved a rate of 98.38%. Since we achieved a 98.05% recognition rate with a scheme that did static pattern matching on the first and second time-halves of our utterances, we must call into question the effectiveness with which the Viterbi algorithm uses time order information. Our results also lead us to conclude that future progress may depend on our ability to construct more sophisticated vector quantizers.