VOICE ACTIVITY DETECTION SYSTEM, METHOD AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide a highly accurate voice activity detection method in a low S/N environment.

SOLUTION: The voice activity is performed by extracting a long-term spectrum variation component and a harmonic structure as feature vectors from a speech signal and increasing difference in feature vectors between speech and non-speech included in the speech signal by using the long-term spectrum variation component feature, or a long-term spectrum variation component extraction and a harmonic structure feature extraction. A correct rate and an accuracy rate of the voice activity detection is improved over conventional methods by using a long-term spectrum variation component having a window length over an average phoneme duration of an utterance in the speech signal. The voice activity detection system and method provides speech processing, automatic speech recognition, and speech output capable of very accurate voice activity detection.

COPYRIGHT: (C)2009,JPO&INPIT