Digital Automatic Word Recognition Procedure

An eighteen‐channel Vocoder has been utilized in conjunction with the AFCRC magnetic computer in a real time word recognition study. This paper briefly describes this equipment and the manner in which it is used in both learning and recognition modes. Any new input word may be added to a computer vocabulary after several utterances and subsequent labeling of that word through the computer typewriter. In the recognition mode, previously learned words are identified and typed. Recognition of an unknown word is accomplished by selection from the computer vocabulary of the word closest to the unknown word as indicated by several measures. Formulas are derived for computing the optimal representation of a given word for the computer vocabulary from a number of utterances of that word. By using the previously described equipment and pattern recognition procedure, results have been obtained in several areas: (1) Over 2000 recognitions of digits between zero and ten involving thirty talkers have been made. Numeri...