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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">RUDN Journal of Engineering Research</journal-id><journal-title-group><journal-title xml:lang="en">RUDN Journal of Engineering Research</journal-title><trans-title-group xml:lang="ru"><trans-title>Вестник Российского университета дружбы народов. Серия: Инженерные исследования</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2312-8143</issn><issn publication-format="electronic">2312-8151</issn><publisher><publisher-name xml:lang="en">Peoples’ Friendship University of Russia named after Patrice Lumumba (RUDN University)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">40356</article-id><article-id pub-id-type="doi">10.22363/2312-8143-2024-25-2-111-120</article-id><article-id pub-id-type="edn">HMIHLA</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Статьи</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Algorithmic Support for Spectral Processing of Cardiograms</article-title><trans-title-group xml:lang="ru"><trans-title>Алгоритмическое обеспечение спектральной обработки кардиограмм</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0359-0897</contrib-id><contrib-id contrib-id-type="spin">8247-7310</contrib-id><name-alternatives><name xml:lang="en"><surname>Andrikov</surname><given-names>Denis A.</given-names></name><name xml:lang="ru"><surname>Андриков</surname><given-names>Денис Анатольевич</given-names></name></name-alternatives><bio xml:lang="en"><p>Ph.D. of Technical Sciences, Associate Professor of the Department of Mechanics and Control Processes, Academy of Engineering</p></bio><bio xml:lang="ru"><p>кандидат технических наук, доцент кафедры механики процессов и управления, инженерная академия</p></bio><email>andrikovdenis@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0005-6632-9102</contrib-id><name-alternatives><name xml:lang="en"><surname>Kurbanov</surname><given-names>Sinan V.</given-names></name><name xml:lang="ru"><surname>Курбанов</surname><given-names>Синан Владимирович</given-names></name></name-alternatives><bio xml:lang="en"><p>Postgraduate student of the Department of Mechanics and Control Processes, Academy of Engineering</p></bio><bio xml:lang="ru"><p>аспирант кафедры механики и процессов управления, инженерная академия</p></bio><email>ya.sinan@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">RUDN University</institution></aff><aff><institution xml:lang="ru">Российский университет дружбы народов</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-07-30" publication-format="electronic"><day>30</day><month>07</month><year>2024</year></pub-date><volume>25</volume><issue>2</issue><issue-title xml:lang="en">VOL 25, NO2 (2024)</issue-title><issue-title xml:lang="ru">ТОМ 25, №2 (2024)</issue-title><fpage>111</fpage><lpage>120</lpage><history><date date-type="received" iso-8601-date="2024-08-11"><day>11</day><month>08</month><year>2024</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, Andrikov D.A., Kurbanov S.V.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Андриков Д.А., Курбанов С.В.</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="en">Andrikov D.A., Kurbanov S.V.</copyright-holder><copyright-holder xml:lang="ru">Андриков Д.А., Курбанов С.В.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by-nc/4.0/legalcode</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rudn.ru/engineering-researches/article/view/40356">https://journals.rudn.ru/engineering-researches/article/view/40356</self-uri><abstract xml:lang="en"><p style="text-align: justify;">The method of recording electrocardiograms as a non-invasive research method is widely used in modern functional diagnostics. Spectral diagnostic methods based on Fourier transform and wavelet transform are being developed. For the purposes of identification of cardiac rhythm disorders, the method of research selected is spectral (frequency) analysis of short-term ECG recordings, up to one period of heartbeats. Fourier series decomposition of the cardiac signal (ECG) in EDF-format for one period was carried out. It is determined that the maximum accuracy of cardiac signal description is achieved at the number of harmonics equal to half of the number of sampling points of the cardiac signal during the period. The correctness of the script developed for spectral analysis was checked by reconstructing the cardiac signal from its spectrum and comparing it with the original signal. The correlation between the spectrum and the shape of the cardiac signal has been established. The conclusion is made about the applicability of the spectral analysis method for the identification of heart rhythm disorders, as well as about the possibility of using the spectrum of electrical signals of heart contractions as a multidimensional function of the heart state. The direction of further identification of regularities by means of statistical analysis with interpretation of results by specialized specialists is indicated. The theoretical and practical value of this study lies both in determining the areas of application of spectral analysis of the cardiac signal for diagnosis and treatment, and in the practical results obtained, which can be used in the development of an expert system or a specific technical device.</p></abstract><trans-abstract xml:lang="ru"><p style="text-align: justify;">Метод регистрации электрокардиограмм, как неинвазивный метод исследования, широко применяется в современной функциональной диагностике. Развиваются спектральные методы диагностики, основанные на преобразовании Фурье и вейвлет-преобразовании. Для целей идентификации нарушений сердечного ритма методом исследования выбран спектральный (частотный) анализ кратковременных записей ЭКГ, вплоть до одного периода сердечных сокращений. Проведено разложение в ряд Фурье на одном периоде кардиосигнала в EDF-формате. Определено, что максимальная точность описания кардиосигнала достигается при числе гармоник, равном половине числа точек дискретизации кардиосигнала в течение периода. Корректность работы разработанного для спектрального анализа скрипта проверялась восстановлением кардиосигнала по его спектру и сравнением с исходным сигналом. Установлена корреляция спектра и формы кардиосигнала. Сделан вывод о применимости метода спектрального анализа для идентификации нарушений сердечного ритма, а также о возможности использования спектра электрических сигналов сердечных сокращений как многомерной функции состояния сердца. Указано направление дальнейшего выявления закономерностей путем статистического анализа с интерпретацией результатов профильными специалистами. Теоретическая и практическая ценность настоящего исследования заключается как в определении направлений применения спектрального анализа кардиосигнала для диагностики и лечения, так и в полученных практических результатах, которые могут быть применены при разработке экспертной системы или конкретного технического устройства.</p></trans-abstract><kwd-group xml:lang="en"><kwd>digital electrocardiogram</kwd><kwd>EDF-format</kwd><kwd>spectral analysis</kwd><kwd>Fourier series</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>цифровая электрокардиограмма, EDF-формат, спектральный анализ, ряд Фурье</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Drozd DD. Basics of application of mathematical models in cardiology. 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