Some of the very first remote controls used ultrasound. http://www.pushclicktouc... | Hacker News

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userbinator on June 14, 2016 | parent | context | favorite | on: Show HN: TCP/UDP over sound

Some of the very first remote controls used ultrasound.

http://www.pushclicktouch.com/blog/?p=107

They didn't even need batteries, since they were purely mechanical.

bcook on June 14, 2016 [–]

My father always referred to TV remotes as "ker-chunkers" because of his experience with an early TV remote that would make a noise like a tuning fork when pressed then the TV knob would make an audible "ker-chunk" as the channel changed.

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