1Witt S M.Use of Speech Recognition in Computer—Assisted Language Learning[D].Cambridge:The University of Cambridge,1999.
2Franco H,Neumeyer L,Digalakis V,et al.Combination of machine scores for automatic grading of pronunciation quality[J].Speech Communication,2000,(2—3):121—130.
3Kawai G,Hirose K. A method for measuring the intelligibility and nonnativeness of phone quality in foreign language pronunciation training I-A]. Proceedings of ICSLP[C]. Sydney: IEEE, 1998. 1823- 1826.
4Tomokiyo M L. Recognizing Nonnative Speech :Characterizing and Adapting to Non-native Usage in Speech Recognition [D]. Pittsburgh: Carnegie Mellon University,2001.
5Young S, Evermann G, Kershaw D, et al. The HTK Book(for HTK Version 3.2) [EB/OL]. http: //htk. eng. cam.ae. uk/, 2002.
6Weide R L. The CMU Pronouncing Dictionary [EB/OL].http: //www. speech, cs. cmu. edu/cgi-bin/cmudict, 1998.
