3 ms·
Exactly what I was looking for, thank you. Interestingly, the wavelength of sound and the wavelength of wifi signals are in the same ballpark. 900MHz electroma
by jerf 1y ago
Exactly what I was looking for, thank you.
Interestingly, the wavelength of sound and the wavelength of wifi signals are in the same ballpark. 900MHz electromagnetic waves come out to ~30cm waves, which is about 1000Hz in sound-in-air.
- lawlessone 1y agojust my lay person thought here. But if you could cancel the noise/signal perfectly and everywhere wouldn't that sorta violate energy conservation? The sound energy has to go somewhere right?
- luke-stanley 1y agoPerfectly? Surely that is not reasonable?
- IAmBroom 1y agoEven imperfectly, the problem remains - and is answered by the "the energy of the cancellation source counterbalances the noise energy."
- card_zero 1y agoThat's an interesting question: what to do with the energy, ideally? Maybe convert it to very low frequency, so it only annoys elephants.
- loa_in_ 1y agoYou are providing the energy by emitting the counter signal in the first place.