ITE Inc   ****   Fatigue Detection and Technology

For information and Demonstrations Please Contact 703-608-3100 or 240-463-2899



FATIGUE DETECTION Systems for operators in high risk occupations:

Flight Crews, Train Engineers, Truck Drivers, Nuclear Plant Operators ...

In line with ITE support of human systems integration in systems design, ITE is introducing new technologies for unobtrusive Fatigue Detection based on real-time analysis of brain activity associated with monitored speech. This Page provides Links to associated Technical Reports and Demonstrations. 

Undetected Chronic Fatigue in operators of moving aircraft and vehicles is statistically the major cause of accidents.

This technology offers objective detection in time to alert the operators.


Technical  Reports

Overview of technical paper delivered in Singapore 2008 —Variations in the chaotic characteristics human speech are strongly related to the speaker’s fatigue condition. When we define a time-local exponent to evaluate the time-local characteristics of speech’s time domain signal and calculate it periodically or continually, it is possible to observe changes in human cerebral activity. The time-local exponent, called the Cerebral Exponent, can be defined like the first Lyapunov exponent. Being able to use the proposed chaotic voice analysis technology to calculate the Cerebral Exponent of speech in real-time provides fatigue detection and prediction for a speaker. 

Link to CENTE Technology Technical Paper  (1.5 MB)

Abstract of technical paper describing the use of CENTE to detect the onset of Operator Fatigue using a train simulator. It is possible to measure human cerebral activity by utilizing a new chaotic method for analyzing the spoken voice. In experiments, we measured the Flicker Frequency and voice derived Cerebral Exponents of subjects at 12-minutes intervals during a ten-hour railway driving simulation exercise. The results confirm that our analysis method is able to measure human central nervous system activity levels, as is possible using the Flicker Tester, from speech. We believe that it will be possible to evaluate the mental and physical condition of critical workers in real-time in their working environments by monitoring only their speech. We also believe that workspace safety will be much improved by the introduction of the new chaotic voice analyzer.

Link to Technical Report Describing CENTE Validation using a Train Simulator  (0.8MB)

Movie Clip Demonstrations

Below are Links to three Movie Clips of Validation Trials for the "CENTE" technology found on the ITE FTP site. Each Clip is 6 to 7 minutes long in Apple Quick Time .mov format. The files are large (size shown). Download times depend on your connection speed (155 MB / 300 Kbs = approximately 9 minutes). Please be patient. Go get a cup of coffee and the clips will open eventually and be very instructive.

The Clip narratives are in Japanese, but the context is obvious as the camera looks over the shoulder of the operator and at the CENTE computer screens. One computer screen shown frequently is the display of the Chaotic Strange Attractor displaying cerebral activity, the Cerebral Exponent (CE) associated with speech. Figures 1 and 2 below show a Normal and Fatigued CE pattern, respectively. As the test and validation trials progress over time these images will display on the computer screen and become the predictors presented in a numerical scale as discussed in the Technical Papers.


Figure 1 Normal      Figure 2 Fatigued                                                                                                                                                                                                                                                  

Three Film Clips:

1.  Link to Train CENTE Validation Clip  (155 MB)

2.  Link to Automobile CENTE Validation Clip  (188 MB)

3.  Link to Truck CENTE Validation Clip  (195 MB)

Please Contact us at ITE for more information or to arrange a demonstration.

Page Rev. 9/16/09