Abstract
Theoretical and experimental data are presented on a standing wave resonance system for obtaining a high pressure sound field with a prescribed harmonic eliminated. It consists of an eight-foot iron pipe ten inches in diameter, and a five-sixteenths-inch wall, with an eight-inch dynamic speaker at one end and a movable iron piston at the other. A pressure of 1000 dynes per cm2 at 100 cycles per second is readily obtained with a speaker input of less than 0.5 watt. Harmonic attenuation factors of 68 to 1 and higher are obtained. Hence the sound field is free of a given harmonic to within a few hundredths of one percent with three percent harmonic in the speaker input voltage.
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