Transcript SBS-128 - D. Moses Consulting

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Sound Barrier System 128
Research and Development Overview
D.Moses Consulting has joined forces with Compound
Security Systems of the U.K., our manufacturer of the SBS
128 Sounder high decibel level acoustic device. This product
is an extension of research and development initiated in the
design of the MK 4 Mosquito which is marketed and sold
extensively around the world.
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SBS 128 Sounder Research and Development Overview
As a result of the MK 4 success in addressing crowd
control, an iterative design process of providing a
higher sound pressure level (measured in decibels)
device would be required as a deterrent in higher
threat scenarios. This process resulted in additional
design requirements incorporated into the SBS 128 db
unit, which has been field engineering tested and
evaluated.
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SBS 128
Operational Design Features
Compound Security Systems has provided the following
operational design features to be incorporated into the SBS
128 Sounder Unit for our review and understanding.
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SBS 128 Sounder System
Compound Security’s Overview
The unit produces a sound level of 128dB @ 3.3Ft, the acoustic signal
has been especially designed to be extremely unpleasant and to induce
ringing of the ears, dizziness and in some individuals, even headache
and nausea.
Note: The audio file has been extensively re-worked to extend both the
operating range and unpleasant effects from the original prototype with
the assistance of a world-renowned professor of acoustics.
The device has been designed to withstand extremes of both
temperature and humidity and using solid-state transducers to operate
at high power efficiency for extended periods.
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SBS 128 Sounder Unit
SBS 128 Enclosure
The enclosure has been designed to resist a high level of attack, being
manufactured in high-grade 12-gauge stainless steel with welded
seams and security fasteners used throughout. Cable entry to the rear
via IP rated stainless cable gland.
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SBS 128
Power Requirements
The unit is designed to run from 110 to 240vac.
Current consumption at 100 watts is in the range of 3 amps per unit.
Rated power 100 watts
Thermal protection has been included to prevent damage to the unit at the
extreme temperatures that some units may be exposed to. This is achieved
by automatically reducing the duration of activation on detection.
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SBS 128
Transducers (Speakers)
An array of 5 by 3 high performance piezo transducers will be utilized.
Note: The initial prototype used an array of 2 by 3 elements; the
manufactured unit uses a larger array to extend the life of the
transducers as well as increasing the sound coverage area.
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SBS 128
Control
The SBS 128 is radio linked to OPTEX HX40 dual element passive infrared
detectors. These detectors are regarded as some of the best commercial
external detectors available with a high immunity to false activations from
wild or domestic animals as well as market leading temperature
compensation circuitry.
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OPTEX HX40 Infrared Detectors
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SBS 128
The detection pattern of the PIR is 85 degrees with a range of 40Ft.
Recommended separation between units is 35 ft with an HX40 detector
mounted at the center point.
Each individual sounder is programmed to operate on activation of one or
more selected detectors, which allows for both the sounder to the right and
to the left to operate on activation of the detector mounted between them.
Operating frequency 418Mhz at 10mw.
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SBS 128 Sounders and OPTEX HX40 Infrared
Detectors Installation Along Fence Line
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Illustrated Area of SBS 128 Sounders and
OPTEX HX40 Infrared Detectors Installation and Coverage
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SBS 128
Time control
There is an inbuilt real time clock within the sounder that can be programmed so that the unit
will only operate between pre-set times over a 7-day period.
The duration of activation after detection will be programmable from 1 to 60 minutes.
The programming of the individual units is accomplished using a wireless hand held encrypted
programming unit.
Each sounder incorporates both a RF transmitter and receiver allowing the entire system to
be disabled and enabled by use of the handheld controller.
This is achieved without the requirement of a separate high-powered radio link as each unit
receives commands from the adjacent unit and passes the instructions down the line.
Guard Patrol Sounder Inhibit Transmitter
An additional feature is a belt worn transmitter that will allow staff to walk the fence line
without activating the devices.
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Sound Barrier System 128
CONCEPTUAL DESIGN CRITERIA
The conceptual design criteria, incorporated in the production of the SBS 128, provides
a sound pressure level which human hearing would experience at the threshold of
pain. Both physiological and psychological effects are non-lethal allowing for a nonconfrontational environment with a presumed threat. The urge to avoid and retreat
results in a rapid and immediate response. This response by any individual or group
acts as a deterrent, therefore preventing incursion into a predetermined and
designated perimeter line of a secured area.
To ensure the understanding of the SBS 128 operational design features as a complete
system, a brief discussion of auditory acoustic noise transmission is warranted . The
following pages simply explain auditory acoustic noise transmission, measuring noise
level and establishing hearing threshold data, and physiological and psychological
effects of high intensity noise levels on human performance.
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In general, acoustics is the
science/technology of sound,
including its production,
transmission and effects.
Auditory Acoustic Noise Transmission
Sound waves impinge on the
outer ear and cause the ear
drum to vibrate. Vibrations
are conducted via a lever
action of the middle-ear
bones to the oval window,
which activates the fluid-filled
inner ear. Portions of nerve
endings in the cochlea are
selectively excited, and their
outputs end in the brain for
further interpretation.
Physiology of Ear Noise Transmission
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Physiological and Psychological Affects of High Intensity Noise Levels
on Human Performance
Our major objectives of testing and evaluating the SBS 128 as an acceptable alarm and warning device for
non-confrontational human scenarios was accomplished. Identifying physiological and psychological affects on
human exposure to decibel levels in excess of 125 db is considered an extreme hazard. The degree of pain and
potential hearing loss is dependent on duration, intensity, and distance from the continuous and/or
intermittent originating noise source.
The following are examples of Physiological affects:
The following are examples of Psychological affects:
1.
Ear Pain
1. Reduced Speech Communication
2.
Hearing Loss
2. Reduced Thought Processes
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Nausea and Vomiting
3. Upgraded Reflex Response (Urge to Avoid
or Escape)
4.
Headache
4. Inability to Perform Simple Tasks
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Abnormal Heart Rate
5. Vertigo
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Measuring Noise Level and
Establishing Hearing
Threshold Data
This example illustration,
identifies the intensity level
measured in decibels on the
vertical scale at different
frequencies (CPS) measured on
the horizontal scale. Both
threshold of hearing and
threshold of pain for different
venues, along with an optimum
conversational speech
envelope, is illustrated.
This example illustrates Intensity
Level (SPL) in Decibels at Different
Frequencies.
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Rapid and Immediate Urge to Avoid and Retreat
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Summary
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The inner ear has the ability to adapt to pure tone or loud sounds. However, it cannot adapt
to the modulated tone and frequency variation of the SBS 128.
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Hearing devices such as headphones and earplugs will muffle pure tone sounds of the SBS
128. However, the tone modulation causes physiological and psychological effects.
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Intruders or would be criminals do not like to lose the ability to hear or see what is going on
around them.
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Studies show that 80% of criminal activity can be eliminated by sound and light.
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In summary, the research and development of the Sound Barrier System 128 has proven to
be a logical first line of defense in deterring any ground threat to company personnel,
infrastructure, materials, and services.
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When considering the mindset of those threats willing to destroy company assets, a nonconfrontational environment initiated by a high sound pressure noise level environment
creates that change in mindset, resulting in the urge to rapidly and immediately retreat.
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Conclusion
In conclusion, any threat analysis scenario involving known threats,
their location, timing and mindset, can best be treated in a non-lethal,
non-confrontational environment. The advantage of the Sound Barrier
System over other security systems is the ability to allow the human
threat to cease and desist long before the need for additional security
assets are required to eliminate a potential unsafe, unwanted event.
In providing a non-confrontational environment initiated by an
individual threat or group, the Sound Barrier System allows for safer
preventive measures, wherein we believe liability is not an issue. Both
friend and foe would easily refrain from contact within the
environment created by this event.
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