We apply the multi-resolution analysis(MRA) of wavelet transform(WT), which was proposed by Mallat [5], to suppress the three main types of noises existing in electrocardiogram(ECG) signals: baseline wander,powerline interference and electromyographical interference.

Designs a digital trap for eliminating 50Hz power-line interference and applies it in eliminating 50Hz interference on ECG signals, based on the law for the pole-zero distribution to influence on the characteristics of frequency response.

This paper introduces the ways in both hardware and software to eliminate power-line interference in MEG detection.

The power-line interference and the linear birefringence effect are pointed out as the key barriers for getting the useful signal from the system,and a way based on modulated light source for depressing the power-line interference is verified,where 2 000 Hz square-wave light is considered as the optic supply.

Design of digital trap filter for reducing power line interference in SEMG

A method which eliminates power line interference in the ECG based on QRD-LS algorithm is studied.

Objective To find a new method for repressing the 50 Hz power line interference in ECG signals.

Extraction and removal of strong power interference;

Aiming at actual instance that the frequency of electric network is waving,based on twin-T resistance-capacitance active-trap filter,a trap filter which can filter the power interference between 49.

It s always difficult in technology to eliminate power interference of 50 Hz in Brainwave Data Acquisition System .

By this algorithm, both the power frequency interference and baseline shift, for example, the ones of ECG signals, can be successfully eliminated.

50Hz power frequency interference is the main noise in the ELF communication system.

It used EMTP to stimulate the power frequency interference to come to a conclusion that the power interference can affect the accuracy of measuring result seriously.