A standard electret microphone can detect sub-audio "sounds" when some simple equalization circuitry is added.

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Your iPhone does a great job of capturing a scene’s colors and tones, and you might think the best iPhone microphone is just the one that is built in, but the quality of its audio recordings may be ...

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Abstract: A bimorph lithium niobate (LN) transducer has been proposed as a microphone. Surface electrodes sense the lateral in-plane electric field in thin LN films resulting from out of plane ...