小波变分辨率频谱特征静音检测和短时自适应混音算法

静音检测算法使用两种语音感觉特征与变分辨率频谱的Mel频率倒谱系数组合成音频特征,采用多门限过零率对静音进行初判,并通过二分类支持向量机对组合语音特征进行分类;实时混音算法使用每一路音频的短时能量作为混音权重.测试表明,静音检测算法在不同信噪比下语音识别正确率高于G.729b静音检测算法;实时混音算法听觉测试优于传统的算法,并且混音计算延时低,满足网络实时传输的要求;两种算法同时应用于视频会议系统,视频会议服务器的运算量低于使用了G.729b静音检测算法的视频系统.

Voice Activity Detection Using Wavelets Multiresolution Spectrum and Short-time Adaptive Audio Mixing Algorithm

The proposed VAD uses MFCC of multiresolution spectrum and two classical audio parameters as audio feature,and prejudges silence by detection of multi-gate zero cross ratio,and classifies noise and voice by Support Vector Machines.New speech mixing algorithm used in Multipoint Control Unit(MCU) of conferences imposed short-time power of each audio stream as mixing weight vector,and was designed for parallel processing in program.Various experiments show,proposed VAD algorithm achieves overall better perform...