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AVSA Fundamentals

Various VSA softwares offer a graphic representation derived from that obtained on the Polygraph. Alpes Software uses sound recordings made in WAV format, to 11,025 Hz, 8bits. The sound is filtered by retaining low frequencies. The envelope is not the most interesting and the modulation is added in order to bring out the low frequency oscillations.

Some VSA softwares use a theory introduced by the British physiologist Olaf Lippold, 1957. They extract the low frequency of about 8 to 12 Hz and deduce a value of stress. Understandably, it's not too difficult to compute the frequency for the curve displayed Image 1, but it becomes much more complex for a curve in image 2.

AVSA
AVSA

Alpes Software, which is the basis and the software designer of Diogenes Lantern Pro now uses a new technique for calculating the value of stress, and not based on a direct calculation of the micro-tremor

Alpes Software uses a knowledge base collected from several VSA experts. Thousands of samples were processed, with approximately 1,200 being retained.

A totally independent scoring excercise was conducted by VSA experts. At the culmination of the project it was notable that 80% of the results had only 5% difference on the estimated values of stress, which provides a consistent and reliable basis for the techniques used by Alpes Software.

The technique consists in training a neural network with 1000 phonemes (utterances) from interrogations. The voice samples are processed to obtain the curves as the Image 1 and Image 2.

These graphs were digitized to provide a basic set to training the neural network. The training of neural network generates a file of weights that are at the heart of the network processor. Some parameters are used to adjust the neural network ; ie : the number of neurons in input, the threshold, the desired error (1%). The duration of training is approximately 45 minutes on a standard PC.

A fundamental property of the neural network is it’s capability to produce a reliable result when we enter a voice graph for which it has not been trained. When we submit a graph for which it was trained, it will produce a result with the specified error (1%).

The software AVSA extracts in real time phonemes, digitizes curves, charts are submitted to the network, then displays the results.

Another interesting neural network property is that there is no need to formalize mathematically complicated formulas to extract frequencies of micro-tremors. The neural processor teaches itself how to deduct the outcome on the basis of data provided.

It is totally free from the assumption 8Hz for low stress and 12 HZ for the presence of stress. Our only certainty is the know-how of human experts who have conducted thousands of successful vsa examinations, together with known solution outcomes.

The AVSA software can calculate up to 20 estimates of stress per second on a standard PC. Chart tests (validated protocols) are scored within 2 seconds. Exam scores (average of the tests conducted) are displayed instantly at the culmination of the last test chart.

AVSA PRO currently provides TWO commercial versions :
Version 1,8A : For structured DOD interview examinations + all auto features. Manual operation is
                        still retained.
Version 1,7 :   For free flow, real time narrative screening. Easy to follow graphics for operators
                       processing high volumes of subjects. Two stress levels engines provided.

Both programs are provided per licence purchased.

AVSA

AVSA PRO’s UNIQUE FEATURES

AVSA PRO 1,8A

The only Automated, true VSA program. AVSA is not LVA.
AVSA auto-scores Validated PDD test protocols ( Zone & MGQT’s )
(Examiner may score captured response graphics manually)
Auto Tabbing of CQ’s and RQ’s
Auto Scoring of individual tests
Auto Scoring of entire Examinations ( multiple test charts)
Auto Rotation of RQ’s
Auto Control of Cadence –Audible Answer Cue ( Onset Delay of FOF Syndrome)
Auto Assignment of SV (stress value) to every captured word during interview narrative. Recording time frame exceeds Five Minutes per file. Unlimited file capacity.
Auto, real-time check and display of incoming signal volume
Fully Integrated with ALL MS Windows platforms; MS Word / Explorer / Notepad etc
AVSA files tests in alphabetical sequence for individuals. Batch files for corporate and / or regular clients may be created in AVSA Files or other Windows applications.
Fully integrated with MS Windows O/S ( Win 95 – Win 7 )
AVSA PRO utilizes neural network processor power.
Known Solution Database. The expertise of VSA experts spanning 20 years
AVSA PRO training is presented by selected, thoroughly trained professionals.
AVSA PRO is distributed by an internationally certified PDD examiner, recognized DOD professional and author on PDD Techniques and Technologies.

AVSA PRO is the most advanced vsa program available worldwide.
AVSA PRO is written by Alpes Software. The only vsa software ever validated was written by Alpes. (Refer AFRL – ROME study )

AVSA PRO 1,7

Specifically designed to conduct real-time narrative screening interviews, covert or overt. Provides instant, easy to follow colour bars, arrays and % linear graphs to monitor DI / NDI trends and transitions.

Both AVSA PRO 1,7 & 1,8A are provided with a single licence purchase.

IF IT’S NOT AVSA PRO, IT’S OBSOLETE………………………………………….

INTERNATIONAL ACCREDITATION

There is no true International VSA Association. Any claim by any VSA association that it is ‘international’ is a deliberate attempt to mislead consumers. SA PAVSA is an active PDD association in South Africa for the past 8 years.