Speaker-independent connected digit recognition

An algorithm for speaker-independent connected digit recognition for telephone use, and its experimental results are described. The main features of this algorithm are the use of multiple reference templates assigned to each speaker class, a continuous DP matching process for word spotting, and partial reference templates to confirm spotted digits. The K-nearest neighbor decision rule and pair-comparison judgement are used to obtain the final result from spotted digit sequences. Experimental results show the average correct recognition score to be 94% for each Japanese digit in their connected utterances through actual telephone lines.