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Digital Audio Recording Transceiver (DART)
Audio Surveillance with Digital Audio Processing
for Law Enforcement and Intelligence.
Key Features
- Wide dynamic range and high audio fidelity
- Real-time audio monitoring using wireless
communication link
- Mono and stereo modes of operation
- Digital recording and data storage
- Digital data authentication
- Large quantities of local storage
- Triggered modes of operation
- Indoor and outdoor operation
- Small size and low power consumption
- Wired and wireless monitoring and control
- Robust data recovery protocols
- PC-based user interface
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The DART device digitizes, compresses,
authenticates, stores and transmits surveilled audio. It is
supported by a PC-based user interface.
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High Fidelity, Digitally Recorded Audio
The DART system employs the latest digital audio
intercept, monitoring and recording technologies in a flexible, highly usable
DART device with unmatched audio performance. Surveilled audio is digitally
recorded at the source of the audio. Digital recording enables numerical
authentication and digital data compression of the original audio and allows for
large quantities of local data storage in nonvolatile memory. Stored data can be
transmitted in near real-time for monitoring via a wireless link and can be
recovered at a later time using the same wireless link or a high-speed wired
connection.
DART offers user-selectable parameters that can be
configured over-the-air from a PC-based field terminal, allowing the operator to
best execute the mission. The field terminal also provides for wireless recovery
of stored DART data and for executing built-in tests for a deployed DART. DART
incorporates design elements to conserve power for extending mission life and to
provide a small form factor for aiding in concealment of the device with
batteries. The DART system is designed to increase post-processing options for
difficult audio collection situations characterized by high levels of external
audio interference and concurrent speakers.
Features and Benefits
- Audio Quality - Linear gain and 16-bit digitized
audio sampled at up to 24 kHz provides wide dynamic range and high audio
fidelity.
- Authentication and Integrity - Digitized audio
samples are signed with a unique digital signature generated by industry
standard data authentication algorithms. Each DART module contains a unique
identification number that is burned into the internal processor silicon at
the time of manufacture and is used in data communication.
- Indoor and Outdoor Operation - The DART module
is tested to outdoor unsheltered operating temperature ranges, and the
electronics are enclosed in an aluminum housing designed to meet IP-65
splash resistance.
- On-Device Digital Storage - Onboard CompactFlash,
currently the most memory dense solid-state memory technology, provides
on-device storage for audio at the highest level of fidelity. Compressed
audio storage modes (at reduced audio fidelity) can increase the amount of
on-device audio storage time by a factor of 6 with a quality that surpasses
.mp3 recording.
- Triggered Recording - The DART module can
operate in a mode that conserves battery power and memory by waiting to
record until an internal sound detector and/or an external input, such as
from a motion detector, activates.
- Dual-Channel Recording - The DART device
includes mono and stereo modes using one or two external microphones.
- Power Conservation Techniques - Perhaps the
greatest feature of the DART design is the power management implementation,
which permits major sections of the DART processing electronics to be turned
off to extend operational life and meet aggressive mission duration
requirements on a single set of batteries.
- Configurable Operating Parameters - A simple
though highly capable user interface running on a PC allows operating
parameters to be tailored to meet specific mission objectives for audio
recording trigger, fidelity, monitoring, recovery and other operating
characteristics.
- Wired/Wireless Monitoring and Control - An
internal radio modem provides operator control of configurable operating
parameters and supports near real-time monitoring along with retrieval of
audio information stored in the device memory. A wired interface provides
for high-speed serial communication via a cable.
- User Interface - A user interface running on a
PC provides for command and control of the DART, configuration of operating
parameters, monitoring, and recovery of data. The user interface is capable
of verifying the authenticity of the recovered recordings, storing the
recording to CD or DVD, splitting and/or merging recordings for ease of
analysis, and exporting the data to .wav files that can be played using
standard media players.
For more information,
contact
James A. Moryl,
Director, Surveillance and Geolocation Department.
Surveillance and Geolocation
Signal Exploitation
and Geolocation
SwRI Technical Divisions
 SwRI
Home
March 25, 2013
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