Abstract
A panel of subjects assessed the noisiness of six cars at four constant speeds. The sound pressure levels existing in the vehicles were measured in one-third octave bands from 25 to 10,000 Hz, and also using the A and B weighting networks. From the band levels estimates were made of single figure parameters to describe the noise environment, i.e. Zwicker Phons, Stevens Phons, Noise Criterion, Noise Rating Number and Speech Interference Level. Good correlation was found between subjective assessment and Zwicker Phons, Stevens Phons, dB(A) and dB(B). Less good correlation was obtained between the subjective assessment and Noise Criterion, Noise Rating Number and Speech Interference Level. The experiment indicates that subjective response to internal car noise can adequately be measured using the A weighting network.
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