DIGITAL VOICE STRESS ANALYZER (DVSA)

BAKER GROUP - WHAT IS DVSA

Voice Stress Analysis (VSA), originally known as Psychological Stress Evaluation (PSE), is a procedure used for detection of deception (lie detection) or truth verification or to determine psychological stress profiles. The technology has been used for over 30 years. BAKER-DVSA software has dramatically improved on that outdated technology. Over 15,000 various VSA systems are in use worldwide. More than 1500 U.S. law enforcement agencies use VSA. The U.S. Department of Defense uses VSA in its fight against worldwide terrorism.

In the fall of 2000, Air Force Research Laboratories (AFRL), Rome, NY and the National Institute Of Justice’s National Law Enforcement and Corrections Technology Center released its findings on voice stress analysis (VSA) technology. Those results confirm the accuracy of VSA technology. An edited copy of the AFRL news release follows:

ROME, N.Y., ( AFPN) -- 

A three-year study by Air Force Research Laboratory Information Directorate engineers here has concluded several features of voice stress analysis are effective for detecting when a person is answering questions under stress. "The Department of Defense Polygraph Institute (DoDPI) provided us with tapes of investigations from two murder cases where the suspects eventually confessed and were found guilty," "Using voice stress analyzers ... (the) machines were accurate on 45 out of 45 instances."

Dr. Baker provided VSA training to the Rome Lab analysts and engineers for the above study, provided polygraph and DVSA training, and continues participating in Phase II with the DVSA.

Earlier studies conducted by both government and private organizations show similar VSA validity and reliability.

Since its inception in the early 1970's, VSA detection-of-deception technique is now utilized throughout the world by law enforcement investigators, arson investigators, military intelligence & counterintelligence units, psychologists, psychiatrists, insurers, and government agencies. VSA technology is effectively utilized worldwide in locations such as the European Communities, South Africa, Central and South America, Middle East, Asia, Israel, Egypt, Saudi Arabia, South Korea, the Balkans. Now, through DVSA software, the science is easier to use and more effective than ever before.

HOW DOES IT WORK?

THERE ARE NO ATTACHED SENSORS, BLOOD PRESSURE CUFFS, and OR ELECTRODES as in polygraph examinations.

Verbal responses are processed through a computer utilizing proprietary BAKER - DVSA software. The software detects, measures, and displays certain stress-related components of the voice. Superimposed on the audible voice frequencies are inaudible frequency modulations (FM) whose strength and pattern relate inversely to the degree of psychological stress in the speaker at the moment of utterance.

These involuntary frequency modulations result from minute oscillations of the muscles of the voice mechanism. Such oscillations, known as physiological tremor or micro-tremor, can be shown in the laboratory as a normal accompaniment to the activity of any voluntary muscle, occurring at a rate of 8-14 cycles per second. Most of the functional indicators of stress are attributed to the Autonomic Nervous System, physiological tremor as seen in the voice mechanism is controlled by the Central Nervous System; as the ANS gains dominance in a stress situation, the micro-tremors are suppressed, and the FM in the voice utterance is moderated or completely disappears.

LITTLE OR NO STRESS (PROBABLE TRUTH)

 

HARD TYPE STRESS (POSSIBLE DECEPTION)

Actual DVSA stress patterns.

Actually, the voice is just the carrier of certain physiological reactions to psychological stimuli. The voice itself is not evaluated and any attempt to control the voice is a waste of energy. It simply doesn’t work. There are no known countermeasures. Nervousness, medical disability or drugs have no effect on the evaluation.

Voice Stress Analysis examinations can protect one from improper criticism or accusations. It can verify veracity and honesty. It can verify the veracity of the account of the topics being discussed either from face-to-face interview, public speech from radio or TV, or from previous tape recordings. Cold cases are easily resurrected.

Our FORENSIC VOICE ANALYSIS SYSTEM utilizing the BAKER-DIGITAL VOICE STRESS ANALYZER, U.S. copyrighted software is a fast and accurate diagnostic Voice Stress Analysis forensic truth verification system based upon sound scientific approaches, retaining Psychological Stress Evaluator (PSE) validated charting. State-of-the-art high-sample rate digital capture of each utterance, space-age technology Time-Domain Decimation, zero-padding, envelope decay, Frequency Domain Filtration, and Fast Fourier Transform digital signal processing is completed within a fraction of a second. Solutions for voice formant frequency display and proprietary analysis algorithms create easy to interpret charted responses for VOICE STRESS ANALYSIS truth verification. This state-of-the-art software is installed into your existing computers. No need to purchase new equipment. Save thousands of dollars by obtaining this software.

Combining the “Science” of voice stress analysis and the “Art” of detection of deception testing, BAKER- DVSA requires standardized chart reading analysis, time-proven procedures, and specialized examiner training to excel in detection of deception or covert narrative analysis. Our “system” consists of three interdependent elements; the proprietary DVSA diagnostic software, appropriate test protocols, and a highly trained examiner.

DVSA is a fully digital alternative to outdated VSA systems. DVSA utilizes revolutionary innovations that optimize truth verification and counter-intelligence solutions providing examiners new insights like never before. DVSA techniques provide additional possibilities for covertly addressing intelligence and counter-intelligence matters. The system can be utilized for truth verification in any language and any culture and may be used to verify tape authenticity and conduct voice comparisons.