Instruments and Systems: Monitoring, Control, and Diagnostics Annotation << Back Peculiarities of the speech information allocation while its noise masking for the protection purposes S.V. SKRYL A.M. BONCH-BRUEVICH S.S. NIKULIN S. B KOZLACHKOV In the article is described the methodology of not cryptographic protection of the verbal information, witch is based on its noise masking with the subsequent allocation of useful. The unique feature of a mentioned methodology is separation of the verbal information by its noise masking through the use of signals transformation from the waveform into graphic in coordinates frequency-time-level. It is proved advantages graphic spectrograms using. They allow to define presence in record of an acoustic signal of the verbal information which are not perceived aurally, and to simplify process of algorithms processing’s choice, because the signals representation in coordinates frequency-time-level characterizes signal structure most fully. It is considered the order of spectrogram’s formation, most the general approaches the comparative qualitative characteristic is resulted in clearing of a verbal signal of hindrances, such as stratification of an acoustic signal on levels, frequency weighting, spectral subtraction, addition of a hindrance from the reference channel. Key words: not cryptographic protection of the verbal information, acoustic signal, masking of the verbal information, the graphic form of representation of a verbal signal, system of coordinates frequency-time-level, the spectrogram, ways of clearing of a verbal signal from hindrances, a way of stratification of an acoustic signal on levels, a way of frequency weighting, a way of spectral subtraction, a way of addition of signals from various channels, a way of subtraction of a signal of a hindrance from the reference channel. Contacts: E-mail: zi@bmstu.ru Pp. 26-32.