Computer-Based Vectorcardiograph for Research Purposes

Vozda, M.; Hrvolová, Barbora; Krohová, Jana; Šmondrk, Maroš; Penhaker, Marek

doi:10.5755/j01.eee.19.9.5650

Cited by 3 publications

(1 citation statement)

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“…Unfortunately, in both inputs, the common-mode signals are not the same due to mismatches in electrode-skin impedances, cable impedances, input protection circuits (typically including resistors, capacitors, diodes, etc. ), and amplifier input impedances [11,17]. This transformation of the common-mode voltage into differential-mode voltage (V DM ) interference must also be considered.…”

Section: Introductionmentioning

confidence: 99%

Two-Electrode ECG for Ambulatory Monitoring with Minimal Hardware Complexity

Babušiak¹,

Borik²,

Šmondrk³

2020

Sensors

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This article introduces a two-electrode ground-free electrocardiogram (ECG) with minimal hardware complexity, which is ideal for wearable battery-powered devices. The main issue of ground-free measurements is the presence of noise. Therefore, noise suppression methods that can be employed for a two-electrode ECG acquisition system are discussed in detail. Experimental measurements of a living subject and patient simulator are used to investigate and compare the performance of the three proposed methods utilizing the ADS1191 analogue front-end for biopotential measurements. The resulting signals recorded for the simulator indicate that all three methods should be suitable for suppressing power-line noise. The Power Spectral Density (PSD) of the signals measured for a subject exhibits differences across methods; the signal power at 50 Hz is −28, −24.8, and −26 dB for the first, second, and third method, respectively. The digital postprocessing of measured signals acquired a high-quality ECG signal comparable to that of three-electrode sensing. The current consumption measurements demonstrate that all proposed two-electrode ECG solutions are appropriate as a battery-powered device (current consumption < 1.5 mA; sampling rate of 500 SPS). The first method, according to the results, is considered the most effective method in the suppression of power-line noise, current consumption, and hardware complexity.

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Section: Introductionmentioning

confidence: 99%