• How Voice Stress Analysis (VSA) works

    From warmfuzzy@700:100/0 to All on Sat Mar 9 01:15:27 2019
    Have you ever seen those toys on ebay that cliam that they can detect lies
    from samples of a person's voice? They are most certainly snake-oil.
    However the idea of voice-based lie detection is a solid field. If you
    wanted to make your own VSA kit you would get a high-fidelity field recorder such as the Sony PCM-D100 and select the 192 kHz, 24-bit FLAC setting. You would then hire two men and two women to take 2000 audio samples where the answer to the question is either a definte true or false and having all
    parties know for certain that it is either true or false. Such as "Is the
    ball round?" or "it it colored blue." This way both parties can verify
    easily that it is either a definite true or false result. 1000 of the 2000 samples would be a known false, and the second 1000 of the 2000 would be a known truth. The audio would then be analyzed to determine what
    similiarities there are in the truth sample and likewise the false sample. Because the recordings would be of such a high quality there would be a lot
    of data to be able to stastically analyze to determine commons and constants. There would be at least two men for the sample so that differences in a
    persons natural voice can be accomodated for, and having two women giving samples would make the VSA working on women as well as men. Such technology would be suitable for people who consent to the tests, but those who do not consent could use a hoarse voice to "beat the system." VSA can be a part of
    a polygraph set of measurements. It should not be relied on to "prove" one thing or the other, but can be a useful indicator as an additional metric in
    a lie/truth indicator system. To make this technology work can be done for under 25 grand, taking into account the field recorder, the hiring of voice workers, and the development of an analytical algorithm to find
    commonalities and differences. For the usefulness of this technology it is well worth the $25,000.

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