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

摘要： 针对音频评价系统中信号同步处理对算法准确度、复杂度、实时性等要求，提出一种简单、有效、实时的活动音频检测方法。该方法基于音频短时能量特征，通过能量均值和均方差分层逐步调整，动态设定判决门限，通过倒置非活动音频段，快速区分活动音频和非活动音频。提出的方法在低信噪比环境下也能实时地检测出活动音频。

关键词: 能量, 自适应, 音频检测