14. Apparatus as defined by claim 13 further comprising means for time normalizing the training word matrices and the command word matrix before the comparisons thereof.
13. Apparatus which receives spoken input training words and the subsequent spoken input command word and generates a correlation function that is indicative of the resemblance of the command word to each training word, comprising: a. feature extraction means for processing received input words and generating digital feature output signals on particular ones of a number of feature output lines, the particular ones being dependent upon the features present in an input word; b. means for storing, as a time dependent matrix, the status of the feature signals which occur during each training word; c. means for storing, as a time dependent matrix, the status of the feature signals which occur during the command word; d. means for comparing, member by member, the command word matrix with each training word matrix and for generating a correlation figure which reflects each comparison; and e. means for comparing, on a time shifted basis, the command word matrix with each training word matrix and for generating a supplementary correlation figure which reflects each such comparison.