FIELD: data protection. SUBSTANCE: invention is aimed at masking voice signals in secret-information leakage channels within voice signal spectrum. Method includes shaping noise and masking signals and their mixing up; in the process, masking signal is shaped by mixing up formant signals whose short-time autocorrelation functions additionally mask those of vocalized sections of voice signal. Masking jamming shaping device has noise generator, masking signal shaping unit, masking signal amplifier, and output adder. EFFECT: improved masking abilities of jamming. 4 cl, 18 dwg
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