ULTRASONIC FILTER FOR MICROPHONE
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United States of America Patent
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app pub date -
Feb 5, 2015
filing date -
Feb 5, 2015
priority date (Note) -
Abandoned
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Abstract
A measurement system is provided for measuring operational characteristics of ultrasonic emitters, such as their frequency response. A low pass acoustic filter is provided to filter out the ultrasound portion of a modulated ultrasonic signal emitted by an ultrasonic emitter, thereby allowing only the audio portion of the modulated ultrasonic signal to pass through to a measurement microphone. The low pass acoustic filter may include one or more layers of a thin material, such as Mylar, wherein at least one layer of the one or more layers of the thin material have a substantially non-smooth surface to prevent unwanted reflections.
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