Abstract
No matter how much the performance of speech recognition systems improves, it is unlikely that perfect recognition will always be possible in practical situations. Environmental sounds will interfere with the recognition. In such circumstances it is sensible to provide feedback so that any errors which occur may be detected and corrected. In some situations, such as when the eyes are busy or over the telephone, it is necessary to provide feedback auditorily. This takes time, so the most efficient procedure should be determined. In the case of entering digits into a computer the question arises as to whether feedback should be provided after each digit has been spoken or after a string of digits has been recognized. It has been be found that this depends upon the accuracy of the recognizer and on the times required for recognizing the utterances and for changing from recognizing to synthesizing speech.
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