A microprocessor-electrocardiograph

Dotsinsky, Ivan; Christov, Ivaylo; Levkov, Ch. L.; Daskalov, И.

doi:10.1007/bf02446859

Cited by 8 publications

(3 citation statements)

References 2 publications

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“…Moreover, the procedure copes successfully with changes in amplitude and frequency of the interference. The procedure has been continuously improved over the years [12,13,23-32], and implemented in thousands ECG instruments and computer-aided systems [33,34]. Similar approaches have also been published by other researchers [35-41].…”

Section: Methodsmentioning

confidence: 99%

Removal of power-line interference from the ECG: a review of the subtraction procedure

Levkov¹,

et al. 2005

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Background: Modern biomedical amplifiers have a very high common mode rejection ratio. Nevertheless, recordings are often contaminated by residual power-line interference. Traditional analogue and digital filters are known to suppress ECG components near to the power-line frequency. Different types of digital notch filters are widely used despite their inherent contradiction: tolerable signal distortion needs a narrow frequency band, which leads to ineffective filtering in cases of larger frequency deviation of the interference. Adaptive filtering introduces unacceptable transient response time, especially after steep and large QRS complexes. Other available techniques such as Fourier transform do not work in real time. The subtraction procedure is found to cope better with this problem.

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Section: Methodsmentioning

confidence: 99%

Removal of power-line interference from the ECG: a review of the subtraction procedure

Levkov¹,

et al. 2005

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“…The so called subtraction procedure has been developed some decades ago [9,10]. It was further improved over the years [11,12,13,14,15,16] and implemented in thousands ECG instruments and computer-aided systems [17,18]. The subtraction procedure eliminates almost totally the interference without affecting the signal spectrum.…”

Section: Introductionmentioning

confidence: 99%

Power-Line Interference Removal from High Sampled ECG Signals Using Modified Version of the Subtraction Procedure

Dotsinsky

Stoyanov

Mihov

2020

Preprint

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BackgroundThe acquired ECG signals are often contaminated by residual Power-Line Interference (PLI). A lot of methods, algorithms and techniques for PLI reduction have been published over the last few decades. The so called subtraction procedure is known to eliminate almost totally the interference without affecting the signal spectrum. The goal of our research was to develop a heuristic version of the procedure intended for ECG signals with high SR up to 128 kHz.ResultsThe PLI is extracted from the corrupted signal by technique similar to second order band-pass filter but with practically zero phase error. The sample number as well as the left and right parts outside the samples belonging to a current sine wave are counted and measured. They are used to compensate the error arising with the shift between the moving averaged free of PLI signal samples and their real position along the linear segments (usually PQ and TP intervals having frequency band near to zero). The here calculated PLI components are appropriately interpolated to ‘clean’ the dynamically changed in amplitude and position contaminated samples within the non-linear segments (QRS complexes and high T waves).ConclusionsThe reported version of the subtraction procedure is tested with 5 and 128 kHz sampled ECG signals. The maximum absolute error is about 20 μV except for the edges of the recordings. Finally, an approach to PLI elimination from paced ECG signals is proposed. It includes pace pulse elimination, signal re-sampling down to 4 kHz and subtraction procedure implementation followed by adding back the pace pulses.

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“…The two main methods to achieve FR are using a passive network (Dotsinsky et al 1985) or subtracting the dc input voltage by using an integrator to feed back the dc output voltage (Seguine et al 1998, Smit et al 1987, Spinelli et al 2004 (figures 1(a) and (b) respectively). Both approaches restore the baseline level by switching time constants as was described before.…”

Section: Introductionmentioning

confidence: 99%

A capacitive electrode with fast recovery feature

et al. 2012

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Capacitive electrodes (CEs) allow for acquiring biopotentials without galvanic contact, avoiding skin preparation and the use of electrolytic gel. The signal quality provided by present CEs is similar to that of standard wet electrodes, but they are more sensitive to electrostatic charge interference and motion artifacts, mainly when biopotentials are picked up through clothing and coupling capacitances are reduced to tens of picofarads. When artifacts are large enough to saturate the preamplifier, several seconds (up to tens) are needed to recover a proper baseline level, and during this period biopotential signals are irremediably lost. To reduce this problem, a CE that includes a fast-recovery (FR) circuit is proposed. It works directly on the coupling capacitor, recovering the amplifier from saturation while preserving ultra-high input impedance, as a CE requires. A prototype was built and tested acquiring ECG signals. Several experimental data are presented, which show that the proposed circuit significantly reduces record segment losses due to amplifier saturation when working in real environments.

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A microprocessor-electrocardiograph

Cited by 8 publications

References 2 publications

Removal of power-line interference from the ECG: a review of the subtraction procedure

Removal of power-line interference from the ECG: a review of the subtraction procedure

Power-Line Interference Removal from High Sampled ECG Signals Using Modified Version of the Subtraction Procedure

A capacitive electrode with fast recovery feature

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