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Hybrid encoding algorithm for real time compressed electrocardiogram acquisition
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DOI：10.1016/j.measurement.2016.05.085.png)
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Abstract
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Tele-healthcare systems have shown a great promise toward flexibility in wireless medical signal collection and increased mobility of the patient to achieve early diagnosis. We describe a simple, lossy compression algorithm for single lead Electrocardiograms (ECG) using a hybrid encoding strategy, which can be utilized for patient monitoring application. It detects the ECG beats in real time, divides it into equal size 'plain' or 'complex' blocks based on complexity measure and allocate bits using two different principles to optimize the entropy (bits per sample efficiency) in the encoded bit-stream. With MIT BIH arrhythmia data at 1 kHz sampling and 10-bit quantization, the algorithm achieved an average CR and PRDN of 10.99 and 3.27 respectively, with average bit per sample value of 1.49. The average distortion in clinical signatures using PTB diagnostic ECG data was found to be less than 3%, which is clinically acceptable. (C) 2016 Elsevier Ltd. All rights reserved.
Keywords:
Electrocardiogram
Compressed acquisition
Compression ratio
Distortion measure
Bits per sample efficiency
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