基于相位影响的单声道语音增强幅度谱相减改进算法

结合经典语音谱相减算法的基本理论,针对在恢复时域信号过程中利用带噪语音相位来代替纯净语音相位而使消噪效果变差的缺点,基于带噪语音功率谱、噪声谱和纯净语音功率谱三者相位几何关系,提出一种直接使用纯净语音相位来恢复信号的改进算法.经过仿真实验,通过对时域波形图以及信噪比的比较,结果表明提出的算法比经典的谱相减算法均有一定的提升.

Improved Algorithm of Amplitude Spectral Subtraction for Single-Channel Speech Enhancement Based on Phase Influence

In this paper, combining the basic theory of classic speech spectral subtraction algorithm, aiming at the disadvantage of the worse effect of noise elimination because of utilizing noisy speech phase instead of clean speech in the process of recovering time-domain signal, together with the basis of phase geometrical relationship among power spectrum of noisy speech, noise speech and clean speech, an improved algorithm is proposed, which the clean speech phase is direct used to restore signal. Though the simulation experiment and the comparison of time domain waveform and SNR, the result indicates that the proposed algorithm promotes a lot than classic spectral subtraction algorithm.