Kumaravel N, Senthil A, Sridhar K S, Nithiyanandam N
College of Engineering, Anna University, Madras, India.
Biomed Sci Instrum. 1995;31:115-20.
The power-line frequency interference in electrocardiographic signals is eliminated to enhance the signal characteristics for diagnosis. The power-line frequency normally varies +/- 1.5 Hz from its standard value of 50 Hz. In the present work, the performances of the linear FIR filter, Wave digital filter (WDF) and adaptive filter for the power-line frequency variations from 48.5 to 51.5 Hz in steps of 0.5 Hz are studied. The advantage of the LMS adaptive filter in the removal of power-line frequency interference even if the frequency of interference varies by +/- 1.5 Hz from its normal value of 50 Hz over other fixed frequency filters is very well justified. A novel method of integrating rule-based system approach with linear FIR filter and also with Wave digital filter are proposed. The performances of Rule-based FIR filter and Rule-based Wave digital filter are compared with the LMS adaptive filter.
消除心电图信号中的电力线频率干扰，以增强用于诊断的信号特征。电力线频率通常在其50Hz的标准值上下变化±1.5Hz。在本工作中，研究了线性FIR滤波器、波数字滤波器（WDF）和自适应滤波器在电力线频率以0.5Hz步长从48.5Hz变化到51.5Hz时的性能。即使干扰频率在其50Hz的正常值上下变化±1.5Hz，LMS自适应滤波器在去除电力线频率干扰方面相对于其他固定频率滤波器的优势也得到了充分证明。提出了一种将基于规则的系统方法与线性FIR滤波器以及波数字滤波器相结合的新方法。将基于规则的FIR滤波器和基于规则的波数字滤波器的性能与LMS自适应滤波器进行了比较。
