Abstract

Measurements of insertion loss and interior masking noise were conducted using a representative sampling of 23 1972–1973 automobiles. One-third octave-band insertion losses were determined for each car for different orientations with respect to the sound source. One-third octave-band interior masking noise levels were determined from tape recordings made during preselected portions of a test drive. An estimate of the sound level and frequency required of a warning device to be “heard” by the driver inside an automobile is given.

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