METHOD FOR ELECTROCARDIO-SIGNAL PROCESSING FOR PERSONAL WEARED CARDIOMONITORS Russian patent published in 2017 - IPC A61B5/452 

FIELD: medicine.

SUBSTANCE: electrocardiograms are taken from the ECG sensors, amplified, and primary analog processing is performed. The analog signal is sampled in its amplitude and time for digital conversion. The isoline drift is corrected by determination of the moving average in a rectangular time window of duration N₁ in 30 discrete samples, followed by subtraction from the input signal. Adaptive normalisation of R-peak signals is performed. Noise and high-frequency interference are eliminated by estimating the difference ΔS_i between the signal area S_N3 within the moving rectangular window N₃ in 15 discrete samples and its average value S_N1 av. in the moving window N₁. The original waveform is retained if the difference ΔS_i exceeds two, and is replaced by the average value of the signal in the moving window N₁, If the difference ΔS_i is less than two. The position of R peaks is localized by threshold detection at a level of 0.5, selecting the maximum peaks from every five adjacent samples and determining the temporal location of the maximum. Atypical cardiocycles are removed, and information related to user's to heart contractions is extracted.

EFFECT: reduced computing costs and capacities, power consumption, increased duration of cardiac monitor operation without changing the batteries, increased reliability of ECG diagnosis, shortened evaluation of the functional state for the patient, and accelerated pre-hospital assessment of heart diseases.

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