2min chapter

Twenty Thousand Hertz cover image

Ultrasonic Tracking

Twenty Thousand Hertz

CHAPTER

Using a Microphone and Devices to Look at Sound

The technology is also being used at sporting events, music festivals and even the mall. It can listen to what's around you and give that information to advertisers so they can get you to buy stuff. The ability to discern between different tones can be correlated to zeros and ones - which we wouldn't see in the wild.

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