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Хорев, А. А. (Автор МИЭТ, ИБ; Horev, A. A.). Исследование спектров звуков русской речи / А. А. Хорев, И. А. Баранов. - Текст : электронный // БЕЗОПАСНОСТЬ ИНФОРМАЦИОННЫХ ТЕХНОЛОГИЙ. - Москва : НИЯУ МИФИ, 2025. - № 4. - С. 18-36. - URL: https://bit.spels.ru/index.php/bit/article/view/1859 (дата обращения: 01.12.2025). - Режим доступа: свободный.
Авторы:	Хорев, А. А., Баранов, И. А.
Ключевые слова:	Защита речевой информации, Словесная разборчивость речи, Формантный метод оценки разборчивости речи, Speech information security, Verbal speech intelligibility, Formant speech intelligibility assessment method
Аннотация:	The word intelligibility of speech W is used as an indicator for assessing the effectiveness of protecting acoustic speech information from its leakage through technical channels. The calculation method is based on the formant method of speech intelligibility assessment. The calculations use the formant parameter of speech Ai and the coefficient ki, which shows the relative occurrence of formants in octave bands, as the initial data for the speech signal. The values of the coefficients Ai and ki were obtained through experimental studies conducted in the mid-20th century using analog technology. Therefore, the purpose of this study is to estimate the values of the coefficients Ai and ki based on the results of experimental studies conducted using modern methods of digital processing of speech signals. As a result of digital processing of audio recordings of Russian speech sounds recorded by 9 speakers (4 men and 5 women), the following were obtained: sound spectra and speech spectra for male and female voices. Based on the processing of sound spectra, the frequency intervals of sounds and formants of male and female speech were determined. A method for calculating the relative occurrence coefficients of formants in octave bands ki was proposed, and the values of these coefficients were obtained for male and female speech. Based on the processing of speech spectra, normalized values of speech signal levels in octave bands are determined for typical integral loudness levels for male and female speech. A method for calculating the formant parameters of speech in octave bands Ai is proposed, based on which the values of these parameters for male and female speech are obtained. Based on the results of the experimental studies, the speech intelligibility is calculated as a function of the signal-to-noise ratio for male and female speech. The analysis of the speech intelligibility calculation results showed that the highest intelligibility is observed for male speech
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