Abstract: The endpoint detection is the key technology of speech signal process. Selecting the short time energy and the short time average zero crossing rate as the feature, according to the algorithm of two levels threethreshold detection, this paper uses relationship operator to avoid the
pointbypoint comparison looping statements, realizes quick and convenient search to endpoint. The restults of simulation experiments on the algorithm show that this method has high accuracy, and makes certain robustness.

Key words: short time energy, short time average zero crossing rate, threshold, endpoint detection