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Abstract
Model testing of jet engine noise control devices has spurred high-frequency microphone development because of the importance of the high-frequency bands in the full-scale noise reduction. Calibration of the Western Electric 640AA microphone to 100 kc by free-field reciprocity has become routine in our laboratory. Some essential details of the technique and results of repeated calibration over a long period are reported. Use of reciprocal equalization in the complementary circuitry facilitates the use in noise analysis. Sensitivity and noise threshold of the 640AA microphone are excellent for model jet measurements.
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