Instead of many algorithms rely on accurate estimation of noise variance, this algorithm estimates noise energy through DCT which extracts local feature.

该算法不依赖于对噪声方差进行估计，直接利用DCT变换对高频各个子带进行局部特征提取，从而估计噪声能量的估计阈值。

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This article proposed the technology of estimation common-mode noise with the energy of switching cycle and FPGA as the main component.

本文提出了用FPGA作为主要器件、以能量为指标的共模噪声评估技术。

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