一种引入延迟的语音增强算法

摘要

针对传统语音增强算法中,只采用当前帧和当前帧以前的信息对当前帧语音谱进行估计而造成变电平噪声和音乐噪声的问题,采用一种改进的引入延迟的语音增强算法.通过引入延迟,可以在对当前帧语音谱进行估计时使用当前帧以后帧的信息,在噪声估计冲采用类似路径搜索的双向搜索方法消除变电平噪声的影响,在先验信噪比估计中采用改进的非因果先验信噪比估计算法,消徐低信噪比平滑不足带来的音乐噪声,在此基础上构建了一个完整的语音增强算法.实验结果表明,该算法基本不受变电平噪声的影响,而且音乐噪声和残留背景噪声都得到了很好的抑制.%Since traditional speech enhancement algorithms usually only use the information of the current frame and the previous frame for estimation of the speech spectrum, which may cause variable level noises and music noise, a improved speech enhancement algorithm with leading-in delay is proposed to solve this problem.By using the information of the frame after the current frame, a two-way search method which is similar to the method of path search can be adopted to eliminate the influence of variable level noises and music noise.An improved non-causal priori SNR estimation method is employed in the priori SNR estimation to eliminate the music noise caused by the inadequate of smooth in low SNR.Based on this, a complete speech enhancement algorithm is constructed.The experimental results show that the proposed algorithm is noy affected by the variable level noise, but can suppress the music noise and residual background noise effectively.