Abstract
The paper considers the possibility of creating a speech-like interference for the means of vibro-acoustic protection of speech information based on tables of syllables and words of the Russian language. The choice of research directions and experimental conditions is substantiated: synthesis of sound files by random sampling of speech elements from a database, research of spectra of synthesized noise, algorithm for creating interference of the “speech choir” type, study of autocorrelation functions of synthesized speech-like interference, as well as their probability distribution density. It is shown that the spectral and statistical characteristics of the synthesized speech-like interference type "speech choir" of five voices are close to similar characteristics of real speech signals. At the same time, the speech choir was formed by averaging the instantaneous values of temporary realizations of sound files. It is shown that the spectral power density of the speech-like interference of the “speech choir” type practically is not changed with the number of averaged “voices” starting from five. The probability density distribution of the speech-like interference value with an increase in the number of voices in the “speech choir” approaches the normal law (unlike a real speech signal whose probability density is close to the Laplace distribution). Evaluation of the autocorrelation function gave a correlation interval of several milliseconds. The articulation tests of speech intelligibility using synthesized speech-like interference with different signal-to-noise ratios showed the possibility of reducing the integral noise level by 12-15 dB compared to noise-like interference. The dependencies of verbal intelligibility on the integral signal-to-noise ratio are constructed on the basis of polynomial and piecewise linear approximations. A preliminary assessment of a possible impact of speech-like interference on the psycho-emotional state of a person was performed. The direction of further research on increasing the efficiency of algorithms for generating speech-like interference is discussed.
Highlights
Алёна Юрий Милена Катя НиколайИнтегральные уровни в октавных полосах речевого хора с разным количеством дикторов
It is shown that the spectral power density of the speech-like interference of the “speech choir” type practically is not changed with the number of averaged “voices” starting from five
The probability density distribution of the speech-like interference value with an increase in the number of voices in the “speech choir” approaches the normal law
Summary
Интегральные уровни в октавных полосах речевого хора с разным количеством дикторов. Каждый аудитор во время испытаний заполняет принятые элементы в специальный бланк, после чего для каждого измерения вычисляется среднее значение разборчивости W по формуле (1):. При проведении артикуляционных испытаний в качестве помехи использовался речевой хор из трех голосов, а в качестве сигналов– аудиозаписи четырех дикторов, созданные в программе-синтезаторе Vocalizer: Диктор 1 – синтезированный женский голос не участвующий в помехе; Диктор 2 – отрывок из фильма, в котором присутствуют и мужские и женские голоса, отличающиеся по уровню громкости; Диктор 3 – синтезированный мужской голос, не участвующий в помехе; Диктор 4 – синтезированный мужской голос, участвующий в помехе. Результаты артикуляционных испытаний для Диктора 4 с помехой типа речевой хор, созданной на основе слов q, дБ. По усредненным значениям артикуляционных испытаний семи аудиторов для всех дикторов созданы графики аппроксимаций для РПпомех из слогов и слов, представленные на рисунках 3-6. Средняя ошибка аппроксимации – среднее отклонение расчетных значений от фактических: A. При этом средняя ошибка аппроксимации не определена для нулевых значений. Значение ошибки аппроксимации до 15% свидетельствует о хорошо подобранной модели уравнения
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