How old are your ears? (Hearing Test!)
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It's a nice attempt but using a flash video player to play test tones is a very bad idea.
I can already hear with the low frequency test tones that there are glitches. Multiple passes of lossy compression (youtube re-encodes) can further cause distortion. Sample rate mismatch can cause aliasing.
But it's still a simple way to show how such high frequencies "sound" like, or how annoying they are.
Edited by xnor - 8/14/13 at 10:50am
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One also has to take into account headphone driver capability, I could quickly scare people off letting people listen with my Q40. xD Generally I hear up to around 16.000 with these headphones, 16k will be noticeably more quiet than 15k though. The FR response below probably shows why ^^
Edited by RPGWiZaRD - 8/25/13 at 11:55am
Has anyone got a decent substitute for an online (or downloadable) "hearing" test?
I try to take good care of my ears. Even then, I'm a little paranoid about doing one - I had mine checked professionally a few years ago, but that was.. A few years ago
EDIT: Even a decent frequency sweep would be fine.
Nope. And it's not possible because there is no way to calibrate the system all the way through the transducer (headphone). You simply have no way to know what exact level is being presented to your ears, and the unknown frequency response of your headphones only makes it worse. The results of any self administered test done without audiology-grade equipment is meaningless.
Sorry, even more vague. There's no way to collect hearing data from a sweep. It has to be spot frequencies at various levels.
The idea of the sweep was to be able to vaguely determine how much damage I've collected over the years, to my sensitivity to higher frequencies - Will I still be able to hear above 15.5Khz? If it's narrated with on-screen prompts (currently displaying the frequency being played) it may help.
I'm aware it won't be anywhere near as accurate as a professional hearing test - as mentioned, I've had professional testing before.
Hearing doesn't just stop at some frequency, it gets less sensitive. High frequency hearing decreases with age but you can "force" high frequencies to be audible just in increasing level. Your hearing response is a curve. If the curve drops below your audible threshold at 10KHz, for example, but you increase the volume 10dB, then the curve may not drop below your audible threshold until 15KHz. Your conclusion will be, "I can hear to 15KHz!", when a real audiometric test would show the actual loss at 15KHz. But if you can't hear 15KHz, and keep turning it up to see if you can hear it at all, there's a real potential for hearing damage.
You need to know the absolute reference level of the test signals, or all you'll get is a very distorted view of your hearing.
You might be able to find a university in your area that has a medical program with some sort of hearing research lab. Interns need people to practice on, you might be able to get a hearing test as a volunteer.