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An Application of Lock-in Amplifier to Eliminate the Power Line Interference in EEG(PDF)

南京师范大学学报（工程技术版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2009年03期
Page:
75-78
Research Field:
Publishing date:

Info

Title:
An Application of Lock-in Amplifier to Eliminate the Power Line Interference in EEG
Author(s):
Shao Yi; Tong Tangji; Zhan Qingbo; Chen Ying
Institute of Biomedical Engineering,Nanjing University,Nanjing 210093,China
Keywords:
lock- in am plifier;  deno ising;  EEG;  pow er- line frequency interference;  feedback
PACS:
TN721
DOI:
-
Abstract:
Th is paper introduces a new type o f pow er- line inter fe rence rem ova lme thod, the ma in idea o f the algor ithm is der ived from the lock- in am plifier in ha rdw are c ircu it, w hich can accurate ly test the amp litude, frequency and phase o f pow er- line interfe rence in the signa ls, and ga in the co rrec t low-no ise signa l through subtracting the reconstruc ted interference signal from the or ig ina l signa .l Th is algorithm inher its the exce llent ant-i in terference ab ility of lo ck- in amp lifier. Th is a lgor ithm has been tested in an experim ent, in wh ich w e used a period of sing le- lead EEG data of 200H z samp ling frequency. W e added the data w ith no ise s igna l w hose amp litude, frequency and phase varied random ly in a certa in rang e. The restored w ave fo rm we finally obta ined is almost the same as the o rig inal w ave form. And com pared w ith the po llution w ave fo rm, SNR o f the resto red waveform im proves about 30 dB. The resu lts are satisfac to ry.

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Last Update: 2013-04-23