LVA technology

Layered Voice Analysis (LVA™) is Nemesysco’s core technology, developed by Amir Liberman

In its essence, LVA technology enables better understanding of your suspect’s mental state and emotional makeup at a given moment by detecting the emotional cues in his or her speech. The technology identifies various types of stress levels, cognitive processes, and emotional reactions that are reflected in different properties of the voice. This information provides insights into the way the subject thinks, what troubles him, what excites him, what portions of his speech he is uncertain about, what questions require more of his attention, and what areas appear to be sensitive issues for the speaker.

LVA uses a unique mathematical process to detect different types of patterns and abnormalities in the speech flow and classify them in terms of stress, excitement, confusion and other relevant emotional states, found through our research to be highly correlated with these emotions.

LVA technology further enables the user to explore several levels of emotional intensity, and by doing so, expose additional layers of information that would otherwise be unavailable. This information can save crucial time during any investigation processes.

Nemesysco’s layered voice analysis is a new and proprietary technology and has no relations to the old “Voice Stress Analysis” (or VSA) technologies, nor does it use any previously known method for detecting “voice stress”. As such, LVA does not perform “micro tremors” (8-14 Hz) analysis in the voice, and can be used over telephone lines and with standard commercially available microphones.

The human speaking mechanism

The human speaking process is one of the most complicated procedures the human body performs due to the number of muscles and physical apparatus involved, and the ways in which they need to be synchronized.

When a person speaks, air is pushed upward from the lungs into the vocal cords. Consequently, the vocal cords vibrate at a specific frequency and produce sound. The air continues to flow up toward the mouth where it is manipulated by the tongue, teeth and lips to produce sound streams that we recognize as words or phrases. 

The brain plays a leading role in orchestrating the entire process and monitoring what is said to ensure that the sound you emit is what your brain intended, is at the right volume to be heard by the intended listener, and is further accepted by the listener in the manner you intended it to be received.

LVA properties ignore the content of what your subject is saying and the language being used, and instead focus on the patterns and abnormalities in the speech flow.

LVA and “Lie Detection”

Professionals in the field of lie detection know that there is no such thing as a “real” lie detector, since lying is not a unified reaction that is consistent at all times. Even the polygraph, the most known “Lie detector”, can only function as a lie detector in its pre-defined settings and in the relevant context. Simply connecting a polygraph to a person watching a video or performing any physical activity will render meaningless results.

Lying is a result of a deep logical process that is executed with a particular intention. One might lie to protect himself from harm, while another might lie to gain profit, or even just to make a joke. Due to this variety in motivations and intentions, there is no fixed set of characteristics (physiological or psychological) that differentiate “lies” from “truth”. However, LVA is capable of detecting the associated emotions behind the lie, and by doing so can lead you to identifying and revealing the meaningful lie itself.

Security Vs. Personal use

Intentions and emotional settings change according to the situation, and it is only expected that one will feel far less comfortable (or more “stressed”) when investigated by an officer of the law than when speaking with his friends. In such unique emotional settings, various emotions and other internal processes come to play.

Security level users, depending on their specific task, need a tool that can provide the right amount of information relevant to the case at any given time. Any data that is not related can obscure what is essential. Using LVA based tools, once a specific piece of data stands out emotionally, a determination is made regarding whether further exploration is needed.

While Nemesysco’s personal-use products utilize the commercial level of Nemesysco’s voice analysis technology (SENSE™) to provide both detailed and generalized data, LVA has a dynamic range of sensitivities that automatically zero-in on those emotional indications that are more relevant to the formal investigative procedure.

LVA further provides you with tools to explore any identified piece of information in depth. LVA technology can be utilized both in real-time (for general overview of any subject/case/suspect/witness), and in an offline mode (for more in-depth exploration), using recorded data from any source.

LVA analysis process

This data can be further processed by statistical learning algorithms to predict the probability of deceptive or fraudulent intentions in a sentence or for any other psychological analysis.

LVA has two basic formulas comprised of unique signal-processing algorithms that extract more than 120 parameters from each voice segment.

These are further classified into nine major categories of basic emotions. Depending on the goal of the analysis, several “Final Analysis” formulas can also be applied to the emotional parameter data: “Lie Stress” (or “Risk Level” analysis), “Arousal Level”, “Attention Level”, “Deception Patterns” match, and additional methods of veracity assessments. 

Learn about LVA modes of operation

Please Note – LVA™ is a Trademark of Nemesysco Ltd., and Nemesysco is the only company that manufactures LVA based products. Several software vendors are illegally using Nemesysco brands to promote their products – these are fake products, and have no connection to Nemesysco or the LVA technology.