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Human ear cant hear anything above 16-18Khz...
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You're right. Most people can't hear above 15Khz, some people can hear up to 20Khz. As you get older you lose the ability to hear higher frequencies.
I could've sworn back in sub command that the helo dipping sonar sounded higher pitched than the torpedo ping. Even though the frequencies don't reflect that. The helo would hover and ping at 15khz IIRC (not sure what sensor/s it was actually using, talking about AI helo) What came from the helo was so high pitched I had a hard time hearing it in game. But obviously the torp ping is very easy to hear. I'm almost willing to bet money, what came through the speakers was "backwards" in game.
I'm pretty sure in game, the sound file they use for a torp ping, is actually much lower than 20,000-22,000. Otherwise I'd never be able to hear it and most other ppl wouldn't either.
Make me wonder if its even realistic to hear a torp pinging in RL with the human ear? Or is it something about going through water that changes the pitch? Or perhaps a torp emits sounds at all sorts of frequencies, more than just 20Khz?
I found a link to a free tone generator. I can't hear anything when its playing a tone over 17,000 hz. Absolutely nothing. Could be my cheap speakers though. Funny though, I can barely hear a 10hz bassy sounding note. I'm not sure how accurate this thing is. But check it out. I betcha most ppl can't even here 20,000 hz come through their speakers.
http://www.nch.com.au/action/tnsetup.exe