关键词: 能量, 自适应, 音频检测

Abstract: The paper proposes a new，effective and real-time algorithm to detect active audio in order to meet the demands of accuracy，complexity and real-time property for signal synchronization in audio assessment system.Based on the short time energy characteristics，the algorithm dynamically sets the threshold using average energy and standard deviation，distinguishes active audio from non-active audio by reversing non-active audio segments.The proposed algorithm also produces a good result in low SNR environment to synchronously detect active audio.

Key words: energy, adaptive, audio detection