Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 3

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: power line interference

Sortuj według:

Ogranicz wyniki do:

A segment-wise reconstruction method based on bidirectional long short term memory for Power Line Interference suppression

Qiu Y., Huang K., Xiao F., Shen H.

Biocybernetics and Biomedical Engineering

2018

Vol. 38, no. 2

217--227

The overlap between the signal components of Power Line Interference (PLI) and biomedical signals in the frequency domain makes the filtered results prone to severe distortion. Electrocardiogram (ECG) is a type of biomedical electronic signal used for cardiac diagnosis. The objective of this work is to suppress the PLI components from biomedical signals with minimal distortion, and the object of study is mainly the ECG signals. In this study, we propose a novel segment-wise reconstruction method to suppress the PLI in biomedical signals based on the Bidirectional Recurrent Neural Networks with Long Short Term Memory (Bi-LSTM). Experiments are conducted on both synthetic and real signals, and quantitative comparisons are made with a traditional IIR notch filter and two state-of-the-art methods in the literature. The results show that by our method, the output Signal-to-Noise Ratio (SNR) is improved by more than 7 dB and the settling time for step response is reduced to 0.09 s on average. The results also demonstrate that our method has enough generalization ability for unforeseen signals without retraining.

Improved Data Preprocessing Algorithm for Time-Domain Induced Polarization Method with Digital Notch Filter

Ge S.-C., Deng M., Chen K., Li B., Li Y.

Acta Geophysica

2016

Vol. 64, no. 6

2264--2288

Time-domain induced polarization (TDIP) measurement is seriously affected by power line interference and other field noise. Moreover, existing TDIP instruments generally output only the apparent chargeability, without providing complete secondary field information. To increase the robustness of TDIP method against interference and obtain more detailed secondary field information, an improved dataprocessing algorithm is proposed here. This method includes an efficient digital notch filter which can effectively eliminate all the main components of the power line interference. Hardware model of this filter was constructed and Vhsic Hardware Description Language code for it was generated using Digital Signal Processor Builder. In addition, a time-location method was proposed to extract secondary field information in case of unexpected data loss or failure of the synchronous technologies. Finally, the validity and accuracy of the method and the notch filter were verified by using the Cole-Cole model implemented by SIMULINK software. Moreover, indoor and field tests confirmed the application effect of the algorithm in the fieldwork.

Power supply and signal filtering for 24-hour ECG

Tomala R., Marciniak P., Kotas R., Wenerski M., Napieralski A.

International Journal of Microelectronics and Computer Science

2011

Vol. 2, nr 1

28-34

The goal of this research is to present signals filtering for the high resolution Hotter monitoring system. The first part of this paper concentrates on working of human heart and description of architecture of biopotentials recorder. This part also includes proper amplification and filtration of interferences of bioelectric signals. The second part of this research presents practical realization of Holter monitoring system. Special attention is put on proper selection of components of the recorder and joining them into optimal structure.