Voice Risk Analysis

The Voice Risk Analysis or VRA is a lie detection technology developed by Digilog. It works by detecting the changes in the voice of the subject when he is lying. It will be used by the Harrow council of London during one year to test its reliability fighting benefit claim frauds.

VRA technology works by measuring slight, inaudible fluctuations in the human voice known as 'micro-tremors' that indicate when a speaker delivers words under stress, and when those moments of stress are generated by an attempt to deceive. Voice patterns are analysed and displayed on a computer.

Normal speech ranges in frequency from 8 to 12 hertz. When they are being honest, the average sound is below 10 hertz. When they lie, the stress causes the frequency to rise to above 10 hertz.