In order to segment accurately and on-line,most conventional algorithms are based on small-scale audio classification and always result in a high false segmentation rate.

First, this paper analyzes many simulative signals by Matlab, and thendiscusses the problem of illusive component due to HHT , uses the K-S test to recognise theillusive component, proposes the similarity probability between the IMFs and the signal as thestandard that whether a IMF is illusive or not, and gets t.

Although those experts and educators have got the conclusion that Multiple-choice cloze is easy to deal with, formally-organized, simple to evaluate, facilitates students’guess toward answers, lowers the difficulty of tests, and tends to produce error scores, no experts and educators can analyze the proportion of error scores and the effect it has on validity of examinations comprehensively.