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Recently, much importance
has been focused on the sound quality of vehicles.
We developed two objective evaluation methods for
vehicle sound quality.
First method is to evaluate the intermittent turbid
engine noise during acceleration. Analysis of the
noise by using the human hearing model has clarified
that there are many types of amplitude modulation,
each of which provides a unique sense of unpleasantness.
This method enables objective rating of the engine
noise.
Second method is to
evaluate the exhaust sound quality during acceleration.
Analyzing the terms used to express exhaust sound
quality, we have clarifed important factors for
the rating of exhaust sound quality. Analysis of
the subjective evaluation on precisely synthesized
exhaust sounds has led to the new evaluation method.
This method enables objective measurement of the
properties of exhaust sound.
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