基于信号相位差和后置滤波的语音增强方法

A Speech Enhancement Method Based on Phrase-Error and Post-Filtering

在复杂的声学环境中,通常噪声场特性和混响强度是未知的,这样就对麦克风阵列语音增强算法的性能提出了较高的要求.本文提出一种基于带噪语音信号相位差和后置滤波的语音增强方法.首先,将麦克风阵列接收信号分帧,利用相邻两个麦克风之间每帧带噪语音信号的相位差,构成该帧改变频率点幅度谱值的比例系数,对该帧带噪语音信号进行掩蔽增强处理,得到预处理信号;然后利用固定波束形成、独立分量分析算法和后置滤波技术对预处理信号进一步处理,从而有效地抑制了噪声.计算机仿真实验结果表明,在存在一定混响的多种噪声场中,该方法均具有较好的噪声抑制能力.

In complicated acoustic environment where the characteristics of noise field and reverberation time are unknown,the performance of the speech enhancement methods with microphone array face a great challenge.A speech enhancement method based on phrase-errors of the noisy speech signals and post-filter is proposed.First,in each frame of the microphone array signals,by using the phrase-errors of the adjacent noisy speech signals,we can construct scaling coefficients to preprocess the noisy speeches,and then the preprocessed signals are obtained. Second, by using the fixed beamformer, independent component analysis and postfilter, we can suppress the noises further. Simulation results show the effectiveness of the proposed method in various noise fields with some reverberation.