...分析即可确定语音信号频率范围；但若噪声为乘性的或卷积性的，则需利用倒谱进行分析，此时采用同态滤波器(homomorphic filtering)，即广义线性滤波器的基本思路来去噪。
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homomorphic filter restoration 同态过滤复原
local statistics-homomorphic filter 局部统计同态滤波
homomorphic mean filter 同态均值滤波
To improve homomorphic filter:(1) The cut-off frequency range of homomorphic filter is confirmed.
2.针对同态滤波技术不足的改进：(1)确定了同态滤波器截止频率的范围。
参考来源 - 基于频率域、小波变换和神经网络的真彩图像增强算法研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Because the algorithm of cloud threshold often generates boundary effect, this paper proposed an improved algorithm based on wavelet transform and homomorphic filter.
针对基于小波阈值理论提出的云区阈值法存在的容易产生边界效应的问题，提出了一种改进的单幅图像去除薄云的新算法。
After the gray transformation and the histogram equalization, these images were filtered by a frequency-domain homomorphic filter, hence noises in the images were greatly reduced.
利用自开发软件，对图像进行灰度变换和直方图均衡化处理后，采用频域同态滤波的方法对图像进行降噪滤波处理。
Instead of using the homomorphic filter which is used to get rid of multiple noise and is a biased estimator, this algorithm translates speckle into locally stationary additive white noise.
该算法不同于有偏的去除乘性噪声的同态滤波算法，而是将噪声转化为局部平稳的加性白噪声。
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