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<article article-type="research-article" dtd-version="1.3" 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" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">tuzsut</journal-id><journal-title-group><journal-title xml:lang="ru">Труды учебных заведений связи</journal-title><trans-title-group xml:lang="en"><trans-title>Proceedings of Telecommunication Universities</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1813-324X</issn><issn pub-type="epub">2712-8830</issn><publisher><publisher-name>СПбГУТ</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.31854/1813-324X-2023-9-3-6-13</article-id><article-id custom-type="elpub" pub-id-type="custom">tuzsut-475</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ЭЛЕКТРОНИКА, ФОТОНИКА, ПРИБОРОСТРОЕНИЕ И СВЯЗЬ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ELECTRONICS, PHOTONICS, INSTRUMENTATION AND COMMUNICATIONS</subject></subj-group></article-categories><title-group><article-title>Оценка качества матричного маскирования цифровых звуковых данных</article-title><trans-title-group xml:lang="en"><trans-title>Quality Analysis of Matrix Masking of Digital Audio Data</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5981-4074</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Григорьев</surname><given-names>Е. К.</given-names></name><name name-style="western" xml:lang="en"><surname>Grigoriev</surname><given-names>E.</given-names></name></name-alternatives><bio xml:lang="ru"><p>ассистент кафедры вычислительных систем и сетей Санкт-Петербургского государственного университета аэрокосмического приборостроения</p></bio><email xlink:type="simple">ev.grig95@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4788-9869</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Сергеев</surname><given-names>А. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Sergeev</surname><given-names>A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>кандидат технических наук, доцент кафедры вычислительных систем и сетей</p></bio><email xlink:type="simple">aleks.asklab@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Санкт-Петербургский государственный университет аэрокосмического приборостроения</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Saint-Petersburg State University of Aerospace Instrumentation</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>10</day><month>07</month><year>2023</year></pub-date><volume>9</volume><issue>3</issue><fpage>6</fpage><lpage>13</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Григорьев Е.К., Сергеев А.М., 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">Григорьев Е.К., Сергеев А.М.</copyright-holder><copyright-holder xml:lang="en">Grigoriev E., Sergeev A.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://tuzs.sut.ru/jour/article/view/475">https://tuzs.sut.ru/jour/article/view/475</self-uri><abstract><p>Рассмотрена задача обеспечения конфиденциальности звуковой информации, передаваемой по каналу связи с пакетной передачей. Анализ предметной области показал, что для обеспечения конфиденциальности переговоров используются, в основном, криптографические методы. Однако, наряду с ними, начинают применяться матричные методы защитного кодирования, с реализацией на программируемых логических интегральных схемах или процессорах цифровой обработки сигналов. Данные методы, используя случайные матрицы, накладывают дополнительные инструментальные ошибки при декодировании. Целью исследования является оценка качества защитного кодирования – маскирования звуковых данных квазиортогональными структурированными матрицами. Предложенный в работе метод маскирования цифровой звуковой информации квазиортогональными матрицами отличается от известных предсказуемыми результатами и простотой реализацией. Предложен подход оценки результата маскирования, альтернативный классическому использованию метрик. Он основан на анализе спектральной составляющей сигнала. Показано, что маскирование квадратной матрицей Мерсенна ‒ Уолша приводит цифровую звуковую информацию, представленную в виде матрицы, к виду, близкому по спектру к белому шуму. Это надежно защищает ее в коммуникационном канале от несанкционированного доступа. Полученные результаты показывают перспективность применения предлагаемого метода и предполагают исследование влияния выбора структур ортогональных матриц и их размеров на результаты маскирования.</p></abstract><trans-abstract xml:lang="en"><p>This article considered the guarantee of confidentiality task of audio information transmitted over a packet communication channel. Domain analysis showed, that in most cases cryptographical method used for guarantee of confidentiality of audio information, however, along with them, matrix methods of protective coding used, with implementation on FPGA or DSP processors. These methods, using random matrices, impose additional instrumental errors during decoding. The purpose of the study: is to assess the quality of protective coding ‒ masking of audio data by quasi-orthogonal structured matrices. The proposed method of masking digital audio information by quasi-orthogonal matrices differs from the known ones in predictable results and simplity of implementation. An alternative approach to the classical use of metrics is proposed for evaluating the result of masking. It is based on the analysis of the spectral component of the signal. It is shown that masking with a square Mersenne ‒ Walsh matrix brings digital audio information, presented in the form of a matrix, to a form close in spectrum to white noise. This reliably protects it in the communication channel from unauthorized access. The obtained results showed that the proposed method is promising and suggests the study of the influence of the choice of orthogonal matrix structures and their sizes on the results of masking.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>матричное маскирование</kwd><kwd>цифровая звуковая информация</kwd><kwd>качество маскирования</kwd><kwd>белый шум</kwd><kwd>шумо-подобный сигнал</kwd></kwd-group><kwd-group xml:lang="en"><kwd>matrix masking</kwd><kwd>digital sound information</kwd><kwd>masking quality</kwd><kwd>white noise</kwd><kwd>noise-like signal</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование выполнено при финансовой поддержке Министерства науки и высшего образования Российской Федерации, соглашение № FSRF-2023-0003, «Фундаментальные основы построения помехозащищенных систем космической и спутниковой связи, относительной навигации, технического зрения и аэрокосмического мониторинга»</funding-statement><funding-statement xml:lang="en">The paper was prepared with the financial support of the Ministry of Science and Higher Education of the Russian Federation, grant agreement No. FSRF-2023-0003, “Fundamental principles of building of noise-immune systems for space and satellite communications, relative navigation, technical vision and aerospace monitoring”</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Владимиров С.С., Когновицкий О.С. 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