Parametric Difference-Frequency Generation of Sound in Air.
NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF
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The study explores the feasibility of parametric difference-frequency generation in air through the interaction of two intense high-frequency sound waves. The sound pressure levels at various distances from the source are shown and the directivity of the difference-frequency is described. An experimental apparatus to generate the high-intensity primary signals is explained and some characteristics of the resonator are described. Author Modified Abstract