![]() How can I make you see how amazing this is? Suppose that in 1957 some physiologist had hypothesized that cancer cells have different membrane potentials from normal cells - well, not different potentials, exactly, but a sort of a different mix of modulation frequencies in the variation of electrical potentials between the inside of the cell and the outside. In " Analyzing voice stress",, I complained that I and others had been trying for 30 years to validate the claims behind "voice stress analysis", without even being able to find evidence for the stable measurement (and even the existence) of the features (like variable "micro-tremors" or other "involuntary voice frequency changes") that this technology is supposed to be based on. Here "proprietary", as far as I can tell, means something like "The original 'voice stress' ideas have been thoroughly debunked both theoretically and practically, so now we won't tell anyone how our products work, so that no one can test the ideas without buying our stuff and taking our training - and if they do that and fail to find positive results, we can say that it's because they did it wrong…" "CVSA analyzes vocal input and identifies responses where stress is either present or absent and provides graphical output for each yes or no response." "The technology uses proprietary methods to process the vocal input, typically yes or no responses to direct questions," Kane explains. Muscles in the voice box tighten or loosen, which changes the sound of the voice, and that is what the CVSA technology registers. "The CVSA has gained international acceptance, and our foreign sales are steadily growing," reports Jim Kane, executive director of the National Institute for Truth Verification Federal Services, a West Palm Beach, FL, company that has been producing CVSA systems since 1988.ĬVSA works by measuring involuntary voice frequency changes that would indicate a high level of stress, as occurs when someone is being deceptive. The technology is also gaining momentum overseas. law enforcement agencies have dropped the polygraph in favor of newer computer voice stress analyzer (CVSA) technology to detect when suspects being questioned are not being honest, according to a report from the National Association of Computer Voice Stress Analysts.Īmong those that have already made the switch are police departments in Atlanta, Baltimore, San Francisco, New Orleans, Nashville, and Miami, FL, as well as the California Highway Patrol and many other state and local law enforcement agencies. ![]() Leonard Klie, " Momentum Builds for Voice Stress Analysis in Law Enforcement", Speech Technology Magazine, Summer 2014: ![]()
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