Method of zero sample to remove power noise in weak low frequency signal detection
Jin Gui-bin · Electrical Measurement & Instrumentation · 2008
A novel method of zero sample to eliminate the power noise in the low frequency is presented.In the zero sample,pulses of half power noise period interval that synchronize with the power noise are used to sample the mixed signals when power noises pass zero.The theory analysis and simulation have verified that this method can remove the power noise and times frequency noise effectively in the low frequency,which restrain the random noise in the mean time.This method can be used in any weak low frequency signal detection with certain frequency noise and times of frequency.