Lecture 15 VSA - LIN 4930 Credibility Assessment: Voice...

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LIN 4930 Credibility Assessment: Voice Stress Analyzers
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Introduction What is voice stress analysis? Techniques that purport to detect deception, stress, or other cognitive states from the speech signal Physiological response (CVSA) Psychological intent (LVA)
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Introduction Physiological response The muscle groups that control vocal fold movement become more tense under psychological stress Natural “microtremors” become suppressed Acoustic consequences of vocal fold tension are measured by: Psychological Stress Evaluator (now debunked) Computer Voice Stress Analyzer (CVSA)
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Introduction “Blocking” in CVSA
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Introduction Psychological Intent Phonation (?) and articulation (?) alter systematically when speaker is experiencing a variety of cognitive states Layered Voice Analysis (LVA) Unattested by any published studies; no model provided by the manufacturer Claims to be “voice frequency based”, applying “8,000 mathematical algorithms” to 129 voice frequencies
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Introduction What cognitive states does LVA purport to detect: 1. Emotional Level 2. Cognitive Level (degree of knowing, thinking, learning, judging) 3. Emotional Stress 4. Thinking Level (mental effort)
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This note was uploaded on 10/22/2011 for the course LIN 4930 taught by Professor Habib,r during the Spring '08 term at University of Florida.

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Lecture 15 VSA - LIN 4930 Credibility Assessment: Voice...

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