Correction of wordy legibility's value to evaluate the security of the premises

Abstract: The protected premises, in which confidential information circulates, requires an assessment of their security. To assess the security of premises on the acoustic and vibro-acoustic channel may include appropriate techniques. There is a standard methodology of the Federal Service for Technical and Export Control, which has both advantages and disadvantages. In this regard, the purpose of this work is to correct the values of verbal intelligibility, with the help of the «Whisper» system, taking into account the additions of the standard methodology. In the presented article the resulted results of the analysis of merits and demerits of a technique of an estimation of verbal intelligibility, additions of this technique are considered. To correct the values of verbal intelligibility in calculating the values of verbal intelligibility, taking into account the additions and improvements recommended in the publications of modern authors, we propose: – consideration of the influence of technical means of acoustic reconnaissance, namely narrowly focused microphones and noise cleaning means; – minimization of methodical error due to linearization of the dependence of the sensation level on perception and linearization of verbal intelligibility from the formant. To analyze the data in the presented article, the calculations of the value of verbal intelligibility using another formant method are performed.

Keywords: shotgun microphone, wordy legibility, voice in- formation leak, technical devices of acoustic reconnaissance