Purpose: Designed to protect speech information within a room from interception via mobile phones by creating a standardized signal-to-noise ratio at the input of the phone's receiver (microphone) inside a soundproof container. Key Features:
Maintains a standardized acoustic noise-to-signal ratio in octave frequency bands at the input of mobile phone receivers.
Accommodates up to 4 mobile phones.
Acoustic noise level at 0.5 m from the device does not exceed the PS-40 permissible spectrum.
Frequency range of masking noise:175–10,000 Hz.
Does not interfere with normal operation of mobile phones.
Automatically disables acoustic noise when the container is opened.
Features two LED indicators (open/closed container status).
Power supply:220 V AC (±22 V), 50 Hz.
Weight:1.5 kg.
(Translation maintains technical accuracy while ensuring clarity and readability in English.) Alternative Terminology (if needed):
"Soundproof secure container" instead of "acoustic safe" (for broader applications).
"PS-40 noise spectrum" can be kept as-is (industry standard) or explained as "permissible noise limits per PS-40."
"Signal-to-jamming ratio" could replace "noise-to-signal ratio" in military contexts.