Digital lock-in techniques for adaptive power-line interference extraction

被引：12

作者：

Dobrev, Dobromir ^{[1
]}

Neycheva, Tatyana ^{[1
]}

Mudrov, Nikolay ^{[1
]}

机构：

[1] Bulgarian Acad Sci, Ctr Biomed Engn Ivan Daskalov, Sofia, Bulgaria

来源：

PHYSIOLOGICAL MEASUREMENT | 2008年 / 29卷 / 07期

关键词：

power-line interference; adaptive filtering; lock-in amplifier; synchronous demodulator; phase-sensitive detector;

D O I：

10.1088/0967-3334/29/7/009

中图分类号：

Q6 [生物物理学];

学科分类号：

071011 ;

摘要：

This paper presents a simple digital approach for adaptive power-line (PL) or other periodic interference extraction. By means of two digital square (or sine) wave mixers, the real and imaginary parts of the interference are found, and the interference waveform is synthesized and finally subtracted. The described technique can be implemented in an open-loop architecture where the interference is synthesized as a complex sinusoid or in a closed-loop architecture for automatic phase and gain control. The same approach can be used for removal of the fundamental frequency of the PL interference as well as its higher harmonics. It is suitable for real-time operation with popular low-cost microcontrollers.

引用

页码：803 / 816

页数：14

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