求解反向滤波器的方法讨论

Discussion on the Method of Solving Inverse Filter

阐述去除房间脉冲响应影响的方法,房间脉冲响应的反向逆波器的方法。对房间脉冲响应是最小相位函数,可以直接求反向滤波器,但是对房间脉冲响应是非最小相位函数,要将其分解为最小相位函数和全通函数。对非最小相位函数求其最小相位函数是比较关键,依据倒谱法求出其最小相位函数。当全通函数是纯延迟的,求出的反向滤波器混响的语音信号进行卷积,从而得到的去混响效果非常好。

This paper discusses the methods of removal of room impulse response. It obtains mainly inverse filter the room impulse response. When the room impulse response is minimum phase, inverse filter function can be directly obtained, but the room impulse response is non-minimum phase function, it needs to decompose it into minimum phase function and the all pass function. The key step is to obtain the minimum phase function for the non-minimum phase function.The paper is based on the cepstrum method to calculate the minimum phase function. When the all pass function is a pure delay, The inverse filter is convoluted with reverberated speech signal, the dereverberation effect is very good.