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[ 3.6 ms ] story [ 17.9 ms ] thread
Super cool. Curious how / why ultrasound gets morphed into audible frequency range in air though.
The frequency the transducers produces is too high to hear, but their amplitude is being modulated at a frequency you can hear.

Picture each 40khz wave as a discrete bar in a bar graph and the heights of each bar mapping out the sound you actually hear.