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Approved: CERTIFICATION OF APPROVAL LIE DETECTION USING VOICE STRESS ANALYSIS

ZAHAR, HAZLIN AZMIRA (2006) Approved: CERTIFICATION OF APPROVAL LIE DETECTION USING VOICE STRESS ANALYSIS. Universiti Teknologi Petronas. (Unpublished)

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Abstract

In the existingtechnology, there are severalways for lie detection. Voice Stress Analysis is one of the methods for lie detection. It measures the amount of stress in the subject's voice to detect whether the subject is being truthful or not. The VSA is reported to be cheaper, easier to use, less invasive, less constrained in their operation and more accurate than polygraph with 90 to 95% accuracy. In this project, the theory of Voice Stress Analysis is used to detect deception. Developing the software of lie detection using MATLAB will help in the investigations of law enforcers to detect deception. There are two approaches that are used in this project which are frequency based system and energy based system. The frequency based system detects lie using the variation in the output graph. High variation indicates low stress or 'truthful' voice and low variation indicates high stress or 'lying' voice. The energy based system however, detects deception in the energy spectrum of the voice at 20 to 40 Hz frequency. A flat waveform indicates hard stress while a sharp waveform indicates low stress. Using MATLAB, the voice is processed and both methods are applied. The results for both methods are then compared with the result of a polygraph test. It is found that both methods have different results on certain voice samples and also similar results on certain voice samples. However, the energy based system has more similar results than the frequency based system. Thus, it is more accurate.

Item Type: Final Year Project
Academic Subject : Academic Department - Electrical And Electronics - Pervasisve Systems - Digital Electronics - Design
Subject: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Engineering > Electrical and Electronic
Depositing User: Users 2053 not found.
Date Deposited: 27 Sep 2013 12:01
Last Modified: 25 Jan 2017 09:46
URI: http://utpedia.utp.edu.my/id/eprint/7070

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