The Zenith Space Command, one of the first wireless television remotes ever to exist.
These were so cool. Didn’t they work by the pitch omitted? When a mechanical lever struck a plate that emitted a tone. The tv then receives the tone and completes the task.
Yup. Entirely passively powered - no batteries at all. Pretty ingenious stuff.
I think it’s a noise in the ultrasound spectrum. Humans can’t hear it
Na it made a click, that’s why we call remotes ‘clickers’
The click was the release of a spring-loaded plunger that pushed air through an ultrasonic whistle. The whistle was what controlled the TV or stereo.
Weird I think I saw a YT video explaing it and this is the info I remembered
Looks like it’s a bit of both: while they did work by emitting an ultrasonic frequency, they also made an audible click. https://www.theverge.com/23810061/zenith-space-command-remote-control-button-of-the-month
I feel like there’s a technology connections video on the topic but I could be hallucinating
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