A system for emergency call centres that can assess a caller’s stress levels or emotional state, and hence the urgency of the call, could reduce the impact of any given crisis and improve the emergency response.
A team in The Netherlands reports just such an automatic emotion-detecting system in this month’sInternational Journal of Intelligent Defence Support Systems.
Iulia Lefter of Delft University of Technology and colleagues at the Netherlands Defence Academy and TNO Defence, Security and Safety, explain how emergency call centres are commonly overwhelmed by the sheer number of calls, especially during disaster situations or other national emergencies. A system that could distinguish automatically between a seriously urgent call and a more mundane issue could reduce the burden considerably and allow calls to be prioritised more effectively.
“Stress and negative emotions, in general, have a strong influence on voice characteristics,” the researchers explain. “Because speech is a natural means of communication, we can utilise the sound patterns of speech to detect stress and (negative) emotions in a non-intrusive way by monitoring the communication.” Factors such as how quickly a person is talking, whether or not there are rises and falls in pitch and tone and breathing rate, all change when we are stressed and can be detected.