Developed a fatigue detector that judges the degree of fatigue through sound

In the summer of 2008, Japan introduced an innovative fatigue detection system that assesses a person's level of tiredness through their voice. As temperatures rise, physical and mental energy consumption increases, making it easier to feel exhausted. This can lead to accidents, especially in high-stress environments. Fatigue in hot conditions is often linked to serious health issues like brain and heart diseases. Therefore, early detection of fatigue is crucial for preventing such problems. The Japan Institute of Electronic Navigation developed a portable device that evaluates fatigue by analyzing vocal patterns and brain "vitality." It offers a practical solution for office workers who are exposed to long hours under hot conditions. The device is user-friendly: users answer questions or input data via a touch screen, speak into a microphone, and read a short passage on the display. Within seconds, the system provides a result. The test results are shown as a numerical index called the Brain Vitality Index (CEM), which ranges from 400 to 600 when normal. If the value falls outside this range, the device alerts the user with voice prompts, such as “Please rest” or “You are extremely tired.” This helps individuals take timely action to avoid overexertion. But how does the device determine fatigue based on voice alone? Researchers believe that when the brain is in a non-fatigued state, it generates specific types of noise during information processing. These subtle signals can be detected and measured through voice analysis. The system uses software to analyze sound waveforms, and even if a person tries to mask their voice, the results remain accurate. Traditional methods for detecting fatigue include questionnaires, heart rate monitoring, and work performance evaluation. However, these approaches often lack precision and are inconvenient. In contrast, this voice-based system is simple, non-intrusive, and easy to use. Since May 2008, the device has been tested in Tokyo’s bus companies. It checks drivers’ voices before they start their shifts, helping identify potential fatigue levels. If a driver shows signs of reduced alertness, the system warns them, reducing the risk of accidents. Due to its compact design, it is also suitable for taxis, trucks, and other vehicles. Beyond drivers, the technology could benefit pilots, air traffic controllers, train operators, and healthcare professionals who require high levels of focus. Researchers predict that as the technology advances, the cost will drop to levels comparable to car navigation systems, making it accessible to many households. This innovation marks a significant step forward in workplace safety and personal well-being, especially during the challenging summer months.

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