Keywords: in–vehicle communication, speech intelligibility, hearing in noise test, HINT, driving simulator, jury testing, simulation, driving environments, talker location, listener location, automobile industry, automotive operating conditions, vehicle noise, vehicle vibration, harshness, NVH
The evaluation of speech intelligibility in a simulated driving environment using the hearing in noise test
The implementation of the hearing in noise test (HINT) was carried out using an NVH driving simulator in order to evaluate the speech intelligibility in a car between driver and passenger for a variety of driving speeds and the configurations of the talker and of the listener. The sentence reception threshold (sSRT) was determined for each of the various communication situations. When presented with the same listening task, the participants required on average an approximate 3 dB increase in sound pressure level of the HINT speech material while driving and listening compared to when just listening, for an equivalent speech intelligibility performance. A suggested improvement to the current state of art would be to develop a driving simulation for acoustic perception jury testing as described in this study. This would form the basis of a standard method for a more complete, accurate and repeatable evaluation of in–vehicle speech intelligibility.