This is a portable device that records snoring sounds. It uses a microphone to capture audio, then processes it by filtering out background noise, converting it to digital data, and analyzing both the sound's intensity and its frequency components. This processed information, which can include how many snores occur per unit time, is then stored in memory.
Why it matters: Filed before embedded processors became powerful and efficient enough to perform real-time digital signal processing like FFT and moving average filtering cheaply in a portable, battery-powered device.
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