A word meaning explanation request to a word in document data, which is output as speech, is input from a user instruction input unit. When the word meaning explanation request is input, a text analysis unit analyzes already output document data, which is output as speech immediately before the word...http://www.google.com.tw/patents/US7353175?utm_source=gb-gplus-share專利 US7353175 - Apparatus, method, and program for speech synthesis with capability of providing word meaning immediately upon request by a user
