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New Type of Acoustic Filter Using Periodic Polymer Layers for Measuring Audio Signal Components Excited by Amplitude-Modulated High-Intensity Ultrasonic Waves

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A new acoustic filter that uses four polymer films with half-wavelength spacing was designed and used for detailed measurements of the audio signal components from amplitude-modulated high-intensity ultrasonic waves. The filter provided strong attenuation of the carrier frequency, which is a major cause of microphone nonlinearity. The measurements clearly showed parametric array effects from 300 to 8000 Hz and modulated radiation pressure above 30 Hz.

JAES Volume 53 Issue 10 pp. 930-941; October 2005
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