We propose a new technique with FFT spectrum minimum entropy deconvolution filtering to suppress the periodic narrow-band noise mixed in discharge signal. The principle is the narrow-band noise component will be treated as a new useful signal and the real pure discharge signal as a new noise in frequency domain. In frequency domain, the discharge signal component will be rejected and the narrow-band noise will be kept by minimum entropy deconvolution filtering. The remained noise will be suppressed in the F...
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