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In this paper, we investigate unsupervised fast speaker adaptation based on eigenvoice to improve the performance of Korean connected digit recognition over the telephone channel. In addition, utterance verification is introduced into speaker adaptation to examine whether input utterance is appropriate to adaptation or not. Performance evaluation showed that the proposed method yielded performance improvements. We obtained 18%-22% string error reduction by the N-best-based fast speaker adaptation method with utterance verification using Support Vector Machine.