Zero-Phase Impulsive Noise Suppression with Iterative Phase Reconstruction

A. Ishibashi, A. Kawamura
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Abstract

This paper proposes a zero-phase impulsive noise suppression method with an iterative phase reconstruction. A zero-phase signal is obtained as IFFT of FFT spectral amplitude, and the impulsive noise suppression is achieved on the zero-phase domain. So, the zero-phase impulsive noise suppression is a process of the FFT spectral amplitude, and the spectral phase is unprocessed. To improve the noise suppression capability, we introduce an iterative phase reconstruction method to the zero-phase impulsive noise suppressor. The iterative phase reconstruction generates spectral phase with no contradiction on FFT overlap-add method. Simulation results showed that the introduced iterative phase reconstruction improves PESQ value in comparison to the conventional zero-phase method.
基于迭代相位重构的零相位脉冲噪声抑制
提出了一种基于迭代相位重构的零相位脉冲噪声抑制方法。作为FFT谱幅值的IFFT得到一个零相位信号,并在零相位域实现脉冲噪声抑制。因此,零相位脉冲噪声抑制是对FFT谱幅值的处理,而对谱相位不进行处理。为了提高噪声抑制能力,我们在零相位脉冲噪声抑制器中引入了一种迭代相位重建方法。在FFT叠加法上,迭代相位重建产生无矛盾的谱相位。仿真结果表明,与传统的零相位法相比,引入的迭代相位重建方法提高了PESQ值。
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