ASA 126th Meeting Denver 1993 October 4-8

2aNS6. An assessment of automotive sound quality.

Kathleen K. Hodgdon

Appl. Res. Lab., State Univ., P. O. Box 30, State College, PA 16804

The intent of this research was to define and validate a statistically sound subjective presentation procedure while gathering additional information on individual preferences for sound quality in the passenger compartment of a six-cylinder car. Samples of noise spectra in the passenger compartments of four six-cylinder vehicles were recorded in both steady and accelerating modes of operation. These noise spectra were then presented in a multiple-comparison listening task to 40 individuals for subjective evaluation and ranking from most to least preferred. A nonparametric statistical analysis of the data was completed utilizing the Friedman two-way analysis of variance by ranks. The data were analyzed overall as a function of vehicle and as a function of demographic subgroups of the subjects. A retest of 20 subjects was administered approximately 1 month after initial testing to assess the reliability of the procedure. [This research was sponsored by Advanced Powertrain Engineering, Ford Motor Company.]