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Sound data were recorded from a series of trucks that were operated in various powertrain conditions. The acquired sounds from both the steady state engine speed and second gear wide open throttle operation were then presented to a group of subjects as paired comparisons. Correlation between these subjective ratings to the objective measures of the engine sound were then done and a linear relationship developed.

The following document is a set of guidelines intended to be used as a reference for the practicing automotive sound quality (SQ) engineer with the potential for application to the field of general consumer product sound quality. Practicing automotive sound quality engineers are those individuals responsible for understanding and/or conducting the physical and perceptual measurement of automotive sound. This document draws upon the experience of the four authors and thus contains many “rules-of-thumb” which the authors have found to work well in their many automotive related sound quality projects over the past years. When necessary, more detailed publications are referenced. The intent of publication of this document is to provide a reference to assist in automotive sound quality work efforts and to solicit feedback from the general sound quality community as to the completeness of the material presented.