Vibroacoustic system of voice information protection "ARB-BA"
Certificate of the Operative Analytical Centre of the Presidential Office of the Republic of Belarus No. BY/112 02.01.036 00033 (valid till 21.05.2019)
Vibroacoustic system of voice information protection "ARB-BA" is designated for the prevention of voice information leakage out of the protected object via acoustic and vibroacoustc channels by means of generating adjustable masking acoustic and vibroacoustic noise in air, protective structures and utilities. The application area of the system is to protect confidential voice information, including official restricted information or state secrets related as such in accordance with the established procedure.
Main characteristics and parameters
|
Parameter (characteristic) |
Value (rate) |
|
Primary noise source |
Transistor (transmission "emitter-base") |
|
Number of channels that generate masking interference |
4 |
|
Frequency range of generated interference |
175...8000 Hz |
|
Inequality of noise level spectrum density in octave bands 250/500/1000/2000/4000 Hz |
Not more than ±dB |
|
Type of masking interference |
"White" noise or combined: "voice-like" interference + "white" noise |
|
Entropic coefficient of the quality of the distribution of "white noise" signal envelope |
Not less than 0,8 (in relation to Rayleigh distribution) |
|
Nominal integrated output power of masking interference at load of 4 Ohm |
Not less than 4 W in each channel |
|
Noise signal control range in octave bands 250/500/1000/2000/4000 Hz |
Not less than ±10 dB in each channel |
|
Buoyancy of vibration emitters |
Not less than 0,1 N |
|
Sound pressure at distance of 1 m from acoustic emitter |
Not less than 70 dB (respectively to 20 micro Pascal) |
|
Sound pressure adjusting range |
±20 dB |
|
Continuous operation duration Not less than 8 hours |
Not less than 8 hours |
|
Electric power supply |
220 V-15%+10% and frequency 50Hz ± 1 Hz |
|
Electric power consumed by the system |
Not more than 35 W |
|
Load capacity of one channel |
Up to 12 emitters |
