Speech information security is one of the most important problems in the complex of measures for information security facility or organization. In Ukraine, according to current NDTZI, as a protective signal used only the simplest one-component protective interference of the "white noise" and "pink noise". Frequency range Output should include at least five octaves of frequencies 185600 Hz. This is the range with all devices vibroacoustic protection provided by the domestic market. However, the hearing aid man is able to record the conversation in a wide frequency band 90-11200 Hz, covering seven octave bands. Hence the need to consider the settlement and instrumental method, based on the results of experimental studies conducted by M.B. Pokrovsky. Using the procedure of universal simplex method to calculate the maximum level of intelligibility of speech in some sevenoctave bands.
speech recognition, vibroacoustic leakage channels, active protection of speech information