The present invention relates to speech recognition that enables a user to perform re-utterance recognition, in which speech recognition is performed upon both a second saying of a sequence of one or more words and upon an earlier saying of the same sequence to help the speech recognition better select...http://www.google.com.hk/patents/US7444286?utm_source=gb-gplus-share專利 US7444286 - Speech recognition using re-utterance recognition