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分析了理想情况下离散余弦变换域中语音信号增益,先验信噪比及后验信噪比之间的关系,用实际数据获得了各种信噪比下增益范围的统计特性。基于语音呈Laplace分布、噪声呈Gauss分布的模型,推导了具有相位特性的增益及先验信噪比的估计公式,通过合理性分析得到了简化的相位判别准则。实验结果表明,在高斯白噪声和F16飞机噪声情况下,简化的相位判别可使低信噪比下的语音增强系统的性能得到较大的改善。
The relationship between speech signal gain, a priori signal to noise ratio and a posteriori signal to noise ratio in the discrete cosine transform domain under ideal conditions is analyzed. The statistical properties of the gain range under various signal to noise ratios are obtained with the actual data. Based on the Laplace distribution of speech and Gaussian distribution of noise, the estimation formulas of gain with phase characteristic and prior signal-to-noise ratio are deduced. The simplified phase discrimination criterion is obtained through the reasonable analysis. The experimental results show that the simplified phase discrimination can greatly improve the performance of speech enhancement system under low signal-to-noise ratio under Gaussian white noise and F16 aircraft noise.