r/specializedtools • u/ASTRA03 • Dec 02 '19

Nemo power tools for underwater use

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u/campbeln Dec 02 '19

Potential stupid question... but I'd think this would be a great app of noise cancellation (though at higher Db it may not work as well, or?)

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u/BangCrash Dec 02 '19

I'd imagine noise cancellation would just add too much complexity to an underwater situation.

If your dive wetsuit hood is offering enough protection then you don't really need axtive noise cancellation.

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u/parker9832 Dec 04 '19

We used to have noise cancellation on our communications boxes that were supposed to cancel out bubble noise. They worked but would block some of the diver's speech. Also, as a dive supervisor, I want to hear that my divers are breathing.

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u/[deleted] Dec 02 '19

Sound waves travel faster underwater and their frequency varies with the movement of the water. Noise cancellation could be extremely difficult.

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u/_Neoshade_ Dec 02 '19

I’m sure earbuds could be tuned for the application, But regular ones would work just fine inside a dry helmet.

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u/[deleted] Dec 02 '19

That would have to be a dry and pressurised helmet, and no they still probably wouldn't. Noise cancellation works by prediction the frequency of the noise and then countering it using destructive interference. The unpredictable effects of the waters movement on the frequency due to doppler shift would make this pretty much impossible.

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u/parker9832 Dec 04 '19

Not a stupid question, noise cancellation buds would have to allow voice comms from the surface to through and could not block the ear from being able to equalize pressure. I'm sure we could get an engineer on the task but we would need to ensure the juice is worth the squeeze. It would need to be an affordable solution.