A voice recognition system (204, 206, 207, 208) assigns a penalty to a score in a voice recognition system. The system generates a lower threshold for the number of frames assigned to at least one state of at least one model and an upper threshold for the number of frames assigned to at least one state...http://www.google.com.tw/patents/US6233557?utm_source=gb-gplus-share專利 US6233557 - Method of selectively assigning a penalty to a probability associated with a voice recognition system