Computerized
Voice Stress
Analysis CVSA The Principle
It is a technique used to tell if
a person is lying or not by making voice analysis
1)If
the person is talking normally & telling the truth his voice curve will contain
AM Amplitude
Modulation which is audible &
FM Frequency
Modulation which is not audible and detected by the device. All the man’s
muscles vibrates between frequency
8 - 12 Hz , in the
normal cases the body muscles vibrate at the range of
8-9 Hz this includes
vocal cord which is normal.
2)If the person is
under stress of being telling a lie or deception the body makes the response of
fight or flight increasing the muscle vibration frequency to
11 - 12 Hz which
cause the vocal cord to produce a voice with
AM & without
FM!! . Note
The fight or flight response produced when telling a lie because everyone from
his birth learnt that telling lies is wrong and deserve punishment so the body
give this response. So even is the person is old enough to control himself he
couldn’t control his involuntary system which response to the lie but the
interpretation of the voice spectrum curve is not that simple. Types of CVSA:
there is different types of
CVSA devices like Analogs old instruments with
coming out charts , notebook computers with
CVSA software , in which the curves
can be saved as files and the portable palm
CVSA device like
LiarLiar &
handy Truster.
A most known
CVSA device & software is
Truster & Truster Pro which is Israelian
&
Fortress Personal
Lie Detector ,
which is the only one has a trial 15 days version online , you can download it
from here. When I tried all the download links on the internet I found all dead
so I hope my link would live for awhile.
(This is not an
advertisment or recommendation to any product , all the software names just for
knowledge and aids further web searches by the surfers) CVSA is like Lie
Detectorsmust not
be used in criminal investigations or convicting someone as any person can give
lie response even if he is telling the truth because he is afraid of being
detected but he is telling the truth which will lead to a positive feedback
response which will exaggerate his tension & stress resulting in false positive
lie response?!! . Also if the person was telling the truth in his past life but
his father or mother was telling him that he is telling lies, he will be
stressed if he told the truth because he is afraid that people could accuse him
as a liar as his mother or father was . So the device measures the stress but
can never figure out the reason of this stress which could be of other reason
not related to himself!!
@Download
Fortress Personal Lie Detector Software trial
Quote""
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