THIS IS A NEW PRIVACY MENACE:
The Touch Screen Display on ANY Smartphone,
Tablet, Laptop or Desktop is NOW a MICROPHONE!
WARNING !!! WARNING !!! WARNING !!!
Your brand-new touch screen phone
or tablet is now a secret microphone
which can be hacked to form a transducer
which can STEAL your private conversations!
Touchscreen displays can be one of
the available types including Resistive,
Capacitive and Surface Acoustic Wave (SAW).
These above methods of detecting a finger
touch means that the touch screen on your
phone, tablet, laptop or desktop CAN NOW BECOME
A TRANSDUCER (otherwise known as a MICROPHONE!)
and with appropriate digital signal processing can
INTERPRET sound waves bouncing off your screen
and convert them to text for secret storage
and transmission across the Internet!
New technology has recently come forward
that can obtain the very noisy electrical signal
produced by the touch screen circuitry
in any touchscreen display and convert
it into audible sound.
By getting the UNFILTERED capacitance
or resistance signal BEFORE it is filtered
by the ADAC (analog to digital converter)
software and/or hardware, you can use
STATISTICAL METHODS to interpret the
VERY SLIGHT variations in pressure or
electrical readings coming off the
touchscreen display to create a
synthetic audio waveform that is
an AMPLIFICATION AND ESTIMATION
of what is said in any room.
How Touch Screens Work Wiki Link:
Human speech has a fundamental frequency
range from 80 HZ to 255 HZ and when
translated to multi-frquency bands
will fall into a range between
300 HZ to 3400 HZ.
See Fundamantal Frequency definition:
This fundamental frequency range means
that EVEN A CAPACITIVE TOUCHSCREEN
can be affected by acoustic waves that
affect the local atmosphere near the
surface of a touchscreen thus altering
the electrical conductance of the touch
screen's area of influence, which means
(especially in humid environments!) that
the SPURIOUS ELECTRICAL NOISE generated
as the acoustic waves from our voices hit
a capacitive screen EVER-SO-SLIGHTLY
affecting the electrical conductance properties
of the atmosphere near its surface.
This atmospherically-triggered spurious
electrical activity which is NORMALLY
filtered out using low-pass/high-pass
electrical signal filters built into
the display before being converted to
a 2D-XY coordinate for your computer,
is sent to special digital signal processing
software for further interpretation.
Since MANY NEWER TOUCHSCREEEN DISPLAYS
now have upgradeable software and now use
generic non-discrete circuit chips to do the
noise filtering, it means that CLEVER SOFTWARE
DEVELOPERS can intercept the unfiltered
noise signature coming off the touch screen,
and then run statistical analysis software to
try and recover the audio waveform which
can then be compressed or speech-to-text
filtered for later transmission.
This type of technology BEST WORKS upon
resistive and surface acoustic wave screens
BUT HAS BEEN RECENTLY TESTED AS WORKABLE
on capacitive touchscreen systems !!!!!!
This means governments and criminal
organizations can ADD at the touchscreen
factory or via secret remote installation,
the sofware code to intercept the unfiltered
electrical noise created when sound waves
hit the display's surface.
It now means that NO CONVERSATION IS PRIVATE
on your smartphone, your laptop, your desktop
or tablet computer if it's in your room where
you are talking about ANY sensitive material!
THIS IS SCARY STUFF !!!!
P.S. NO Sources For This Information
Will Be Discussed or Disclosed
AT ALL because those sources
and will be KEPT THAT WAY
as per their request !!!!
edit on 2016/3/29 by StargateSG7 because: sp