The listening jury technique of subjectively evaluating the acceptability of airborne noise radiating from a manufactured product will be much more meaningful if the results of such a method can be converted directly into engineering data. By using a spectrum shaper between the sound source and listening device, the noise spectrum of the product can be shaped to a subjectively acceptable level. The difference between the sound pressure levels in each of the adjustable amplitude pass bands of the shaper before and after shaping the noise spectrum are the reductions in decibels required to meet the subjective criteria. If the pass bands of the shaper have the same characteristics as the pass bands of an analyzer used for engineering data, then the subjective test results will yield objective engineering data.
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