To counter the characteristic of suppress jamming and center of mass jamming, this paper establishes the models of noise jamming, signal power attenuation and center of mass jamming.

针对压制干扰和质心干扰的特点，分别建立了噪声干扰模型、信号功率衰减模型和质心干扰模型。

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The improved smooth algorithm based on the characteristic sub-space used deepen the null to fall the depth, enhanced the system's signal to noise ratio.

研究了改进的基于特征子空间的平滑算法，加深了零陷深度，提高了系统的信噪比。

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The experiment results show that the new technique outperforms the conventional spectral subtraction methods in spectrogram characteristic, output signal-to-noise ratio (SNR) and aural performance.

实验结果表明， 新算法比传统谱相减算法有更优的语谱特性、更高的输出信噪比和更好的听觉性能。

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