Ultrasonics or ultrasound is a radar-like system that uses ultrasonic signals at frequencies above those typical for human hearing, usually above 16 to 20 kHz. The 40- to 70-kHz range tends to be most ...
For the last 30 years, many people have invested a lot of money and effort chasing an unrealized promise of hoped-for explosive growth in home automation. With not a lot of commercial progress, it ...
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