Assessment of security of confidential information from leak on the acoustic and vibroacoustic channel on the basis of definition and calculation of coefficient of noise contamination and octava coefficient of noise contamination

The article presents In article it is said that for an assessment of efficiency of protection of acoustic speech information of confidential character taking into account use of active systems of acoustic vibroacoustic protection it is necessary to enter concept - coefficient of noise contamination and an octava coefficient of noise contamination. The problem of an assessment of security is reduced to comparison of the octava levels of a signal calculated taking into account coefficients of sound insulation of the protecting designs with octava levels of the noise in a place of possible investment of funds of investigation calculated taking into account coefficient of system of active protection.