GUARDSENSE Wireless Through-Wall Audio - Winkelmann (UK)

data sheet
GUARDSENSE
Wireless
Through-Wall
Audio
Features
+ Stand alone, field-ready system
+ Digital-encrypted transmission using
commercial open spectrum (2.4GHz)
+ Uses up to 7 lightweight, weather-proof
wireless microphone sensors
+ High intelligibility listening through
50cm concrete walls
+ Handheld multichannel receiver with
advanced DSP-based noise reduction
+ Over 8 hours of continuous performance time
+ Microphone & contact microphone operation
+ Ruggedized case, inc. outdoor mounting kit
1 2
1. Contact Microphone Transmitter Sensor 2. Microphone Transmitter Sensor
www.winkelmann.co.uk
Applications
A MATTER A MATTER OF NATIONAL OF NATIONAL SECURITY
+ Listening through walls
+ Structure-borne sound sensing
+ Life saving, search and rescue operations
+ Industrial and noisy environments
+ Standard outdoor surveillance operations
+ Homeland Security
+ Suited for use in SWAT & tactical task forces

About the Guardsense
GuardSense provides fire,
police and special enforcement
teams with handheld, digitallyencrypted
sound monitoring
over 250 meters (line-of-sight)
via the commercially open
2.4GHz spectrum, making it
an indispensable intelligence
gathering tool for nearly
every scenario.
Its high performance technology
supports as many as 7 lightweight
wireless sensors capable of very
high intelligibility - even through
concrete walls as thick as 50cm.
The GuardSense receiver includes
DSP based noise reduction, a
built-in speaker, sensor power
and signal monitoring, batteryconserving
sleep functionality and
optional built-in digital recorder.
GuardSense is a wireless, standalone,
high performance device that
enables you to listen and record
through air and through various
surfaces including walls, floors,
windows, and doors without the
need to be inside the room in which
the recording is taking place.
It provides the user with handheld,
digitally-encrypted sound
monitoring over 250 meters (lineof-sight)
via the commercially open
2.4GHz spectrum.
GuardSense has the following
sensor types:
Mic Microphone
Transmitter Sensor
The MIC sensor includes an
omni-directional, highly sensitive
microphone that can pick up a wide
range of speech signals in the room.
The unit transmits the audio
channel to the receiver, in which
ambient noise can be attenuated via
the Receiver’s Noise Reduction 10
segment’s control.
DMic Directional Microphone
Transmitter Sensor
The DMIC (Directional Microphone)
is very similar to the MIC as it
captures speech, but this sensor
uses an internal Noise Cancelling
construction which provides better
directivity (the speakers/target
should be in front of and at the rear
axis of the sensor). This sensor will
not pick up signals further away
from the sensor or at the sides
of the sensor effectively and will
reduce reverberation and echo.
These characteristics, together
with the control of the Noise
Reduction in the receiver, enable
maximum intelligibility from the
speakers/target at the front and
rear of the sensor.
TMic Throw Microphone
Transmitter Sensor
Ruggedized omni microphone
designed to be thrown long
distances, survive impact and keep
transmitting quality audio.
cM contact Microphone
Transmitter Sensor
The CM (Contact Microphone)
senses the vibrations of thin to
medium thickness walls and
converts these vibrations into
audio signals. The sensor should
be attached firmly to the structure,
either using the needle or Blu Tack
(for indoor applications) or the
double side adhesive patches (for
outdoor applications).
TWcM Thick Wall contact
Microphone Transmitter Sensor
The TWCM (Thick Wall Contact
Microphone) is very similar
to the CM but utilizes higher
sensitivity to maximize faint
signals which are attenuated
by thick walls. This sensor is not
ideal for thin structures such as
windows and doors.
PMic Probe Microphone
Transmitter Sensor
Ultrasensitive omni microphone
attached to 30cm semi-rigid
probe, designed for insertion
through tight spaces.

Technical Specifications
RF Properties
Transmitting frequency 2.4GHz
Transmitting principle Digital, encrypted
Maximum number of 7
transmitters per receiver
(one at a time)
Maximum distance At least 250m
between transmitter and
receiver (open space)
Maximum distance At least 250m
between transmitter
and receiver for remote
activation (open space)
Receiver antenna 5dBi
Transmitter power 6-100mW
(maximum power at max.
distance between
transmitter and receiver)
Acoustic Properties
Intelligibility through Up to 50cm (~20”)
concrete wall thickness
Frequency response 20 to 3400Hz
Amplification Up to 10,000
Noise reduction via DSP 0 to 22dB in 10 steps
DSP latency 10msec
Headphones output 102dB SPL
sound pressure level
Loudspeaker output >94dB SPL
SPL (0.5 W @ 1m)
Recording Properties
Signal to Noise ratio 64dB
Recording mode Mono
Compression algorithm Without compression,
u-Law, ADPCM 2-and
4-bytes
Sampling rate 5.5, 8 (default),
11, 16 or 22kHz
Frequency range 100-4000Hz
PC interface USB 1.1, exchange rate
up to 5.5Mbit
Recording Times
Without Compression 329 min (55 kbit/s)
(SR=5.5 kHz)
Without Compression 224 min (80 kbit/s)
(SR=8 kHz) default
Logarithmic Compression 400 min (44 kbit/s)
(u- Law) (SR=5.5 kHz)
Logarithmic Compression 280 min (64 kbit/s)
(u- Law) (SR=8 kHz)
ADPCM 4-bites 800 min (22 kbit/s)
(SR=5.5 kHz)
Recording Times continued...
ADPCM 4-bites 560 min (32 kbit/s)
(SR=8 kHz)
ADPCM 2-bytes 1600 min (11 kbit/s)
(SR=5.5 kHz)
ADPCM 2-bytes 1120 min (16 kbit/s)
(SR=8 kHz)
Electronic Properties
Recommended transmitter Photo-lithium CR2
battery type
Recommended receiver 4 x AA (Alkaline),
batteries rechargeable can be
used for shorter
operational time
Line out (mobile phone ear < 10mV
piece/mic input compatible)
Operational Properties
Operating temperature range 0°C to +60°C
(32°F-140°F)
Receiver and transmitter Up to 8 hours
operation time
Dimensions and Weights
Dimensions of transmitter 40 x 70 x 25mm
(HxDxW)
Weight transmitter 55g
(including battery)
Dimensions receiver 80 x 195 x 35mm
(HxDxW)
Weight receiver 450g
(including batteries)
Receiver antenna 190mm
Package type & dimensions Rugged case, Explorer,
434 x 415 x 149mm
Package weight 5.5Kg

The GuardSense receiver is a
multi-channel receiver designed
for digital encrypted transmissions
which utilizes advanced noise
reduction (DSP) technology. It
contains the main components
for controlling power, microphone
settings, volume and noise
reduction settings, and for
attaching headphones and an
optional recording device.
The basic GuardSense system
comes with two lightweight
wireless transmitter sensors: one
microphone transmitter sensor
and one contact microphone
transmitter sensor.
However, it can be connected
up to seven wireless transmitter
sensors in total, which are
activated sequentially (not
simultaneously).
Technology
GuardSense uses various types
of microphones which sense
pressure and pressure gradients
through the air, alongside contact
microphones which sense the
microscopic vibrations resulting
from sound and noises inside
the room and translates them
into audio signals. GuardSense
is based on unique acoustic
technology resulting in high
quality sound.
It includes a built-in DSP based
Noise Reduction function that
increases voice intelligibility
in noisy environments or
where there is ambient noise,
such as air conditioning or in
highly reverberant rooms. The
GuardSense contact microphone
heads are both highly sensitive
and extremely robust devices. +
Product Codes
GuARDSEnSE TAcTicAl liSTEninG - Full Systems
3-299-581 GuardSense Ultimate - including one receiver with built-in digital
recorder, seven transmitters (4 Contact microphone transmitter
sensor + 3 Microphone transmitter sensor), professional
headphones, receiver antenna, batteries, package of Blu tack
adhesive, two-sided adhesive stickers, Needle Kit (Plaster Wall
Needles & Butterfly screws), Guidance Manual & carrying case.
3-299-582 GuardSense Professional - including one receiver, two transmitters
(1 Contact microphone transmitter sensor + 1 Microphone
transmitter sensor), professional headphones, receiver antenna,
batteries, package of Blu tack adhesive, two-sided adhesive stickers,
Needle Kit (Plaster Wall Needles & Butterfly screws), Guidance
Manual & carrying case.
GuARDSEnSE TAcTicAl liSTEninG - Accessories, components & upgrades
3-299-583 GuardSense Built-in digital recorder (2-8hrs)
3-299-585 Microphone Transmitter Sensor - Capture sound from all directions
3-299-586 Directional Microphone Transmitter Sensor - Capture sound close to
the microphone, reduces reverberation
3-299-587 Throw Microphone Transmitter Sensor - Ruggedized omni
microphone designed to be thrown long distances, survive impact
and keep transmitting quality audio
3-299-584 Contact Microphone Transmitter Sensor - Attach to window,
doors, thin walls to capture speech through vibration of structures
(attach with Blu-tack, adhesive tape, needle kit)
3-299-588 Thick Wall Contact Microphone Transmitter Sensor - Two aggregate
contact sensors for attachment to a thick wall (attach with Blu-tack,
adhesive tape, needle kit)
3-299-589 Probe Microphone Transmitter Sensor - Ultrasensitive omni
microphone attached to 30cm semi-rigid probe, designed for
insertion through tight spaces
3-299-590 GuardSense multi-channel receiver designed for digital encrypted
transmissions with built-in DSP based Noise Reduction function
For further information contact
Winkelmann (UK) Limited
Unit 63, Rowfant Business Centre
Wallage Lane, Rowfant, Near Crawley
West Sussex RH10 4NQ UK
T: +44 (0) 1342 719024
F: +44 (0) 1342 719030
E: sales@winkelmann.co.uk
www.winkelmann.co.uk