A Comparative Study of Several Dynamic Time-Warping Algorithms for Connected-Word Recognition

Research in the area of automatic speech recognition has progressed to the point at which a wide variety of isolated word recognition systems have been implemented and used successfully for many applications.1"9 These systems have been used in such applications as data entry, searching, and sorting; however, use of these systems is restricted by the format of the speech input, i.e. isolated words. For many applications, a connected-word input format would have several advantages. Examples of such applications include: (i) Credit card entry--A sequence of digits (and possibly letters) is required to specify the credit card number. (ii) Directory listing retrieval--A sequence of letters is used to spell the name for which a directory listing is required. (iii) Airline reservations--Sentences based on a restricted vocabulary and a restricted syntax are used to make reservations.