Digital lock-in techniques for adaptive power-line interference extraction
| Autor: | Nikolay Mudrov, Tatyana Neycheva, Dobromir Petkov Dobrev |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Engineering
Amplifiers Electronic Physiology business.industry Biomedical Engineering Biophysics Electrical engineering Phase (waves) Signal Processing Computer-Assisted Fundamental frequency Interference (wave propagation) Square (algebra) Microcontroller Electrocardiography Physiology (medical) Harmonics Electronic engineering Automatic gain control Waveform Humans business |
| Zdroj: | Physiological measurement. 29(7) |
| ISSN: | 0967-3334 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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