INSTRUMENTATION • ELECTRONICS
QUANTIFYING SPEECH INTELLIGIBILITY
Brian Johansen explains how improving human- vehicle communication can create a safer and less stressful environment for travellers
P
eople spend a lot of hours in transit, sometimes travelling alone or in close proximity to others. Tese experiences can potentially have a considerable impact on our sense of well- being, so there is a lot of focus on keeping the cabin calm and quiet. A more recent in-cabin issue stems
from the increasing prevalence of infotainment systems that provide hands- free alternatives to looking away from the road and taking hands of the wheel.
It is important to ensure that when there is communication, from passenger to passenger or operator to infotainment system, that communication is clear. Tis means that much attention must be paid to supressing the unwanted noise from the engine, traffic, wind and tires. Along with supressing this unwanted noise, care must be made to ensure that acoustic treatments don’t dampen or muddle conversation and the ability to interact with phones or infotainment systems.
GRAS’ 45BB-4 KEMAR Head &
Torso Simulator (HATS) for sound quality recording is designed with realistic head and body geometry to provide realistic and quantifiable data from the driver and passenger seats to ensure clear communication in a nice, calm environment. To quantify the data and create a situation where the data can be objectively evaluated, the Speech Transmission Index (STI) is needed.
A KEMAR model in action
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