The DNG-2000 generator

It is well-known that sound distributes though walls, doors, windows and other
constructions. In some materials sound travels even better than through air. For example,
water is a good conductor and a heating system can pass a conversation out of a room.
Eavesdroppers take advantage of this with the use of contact microphones. These
microphones pick up the vibrations from the air ducts, plumbing, structures, walls,
windows, doors, floors, ceilings and more. The microphones may not be in the same
room as the conversation, but may be several floors or rooms away attached to a pipe or
other fixture.
The DNG-2000 can render these devices useless. It produces non-filterable acoustic noise which is transferred to constructions by transducers and speakers.

TRULY RANDOM NOISE

The DNG-2000 consists of 2 independent white noise digital generators. “White” means
that the noise is fully random and is equally distributed along the voice spectrum. This
distribution provides complete resistance against the filtering of a conversation. Another
feature of white noise is its unpredictability i.e. there is no method to wipe it out from a
recorded conversation.

VOICE MASKING

Men’s and women’s voices consist of lots of frequencies simultaneously produced during
speech. These frequencies lie between 100 Hz and 6000 Hz. Listening devices usually
have a narrower range mostly because of size limitations, the scheme of the device and
battery time. The DNG-2000 has a range of 250-5000 Hz which is optimal to cover all
types of voices and suppress all listening devices.

OPERATION

The DNG-2000 uses a combination of transducers and speakers placed strategically
throughout a target area to create a blanket of masking noise that covers private
conversations from eavesdropping. Each transducer utilizes adapters for mounting to a
variety of surfaces such as walls, windows, ductworks, plumbing, etc. The two separate
channels allow the user to tailor the noise for separate materials, allowing greater
flexibility and increased protection.

LOOPBACK INPUT

The DNG-2000 has an input LOOPBACK which allows easy and fast tuning to the
necessary level of noise. Optional probe microphone DNG-MIC and probe stethoscope
DNG-STET are used for the required measurements.

SUPPLIED SET

The DNG-2000 is supplied with AC power cable and user manual. The TRN-2000 and
the OMS-2000 are sold separately. Their quantity depends on the room size and the
situation. The probe microphone DNG-MIC and the probe stethoscope DNG-STET are
also sold separately.

TRANSDUCERS

The TRN-2000 transducer

The OMS-2000 speaker

The TRN-2000 is the recommended transducer for use with the DNG-2000. It has optimal power parameters and can be set on different types of surfaces. The TRN-2000 injects most of its power into surfaces while only a tiny part of the noise gets inside a room. This does not forcepeople to speak louder. The TRN-2000 transducer can be supplied with adapters for mounting on walls, ceilings, windows, etc.
The speaker OMS-2000 can also be used with the DNG-2000. It does not inject the noise
into the surfaces but radiates it into surrounding space. The OMS-2000 is usually used in
air ducts, ceiling tiles, etc.

Download User Manual