Phydeaux on 14/6/2006 at 09:28
I can hear something all the way up to 25k, but only up to 20K do I hear a loud BZZZZZZZZZZZZZZ. Everything above that is a faint whine, which might just be static or something, although I can tell that the pitch does in fact go up.
On the clip from the cell phone site I can hear BZZZZZZZ once volume is up to about 70%; below that I just hear whines.
I'm wearing $20 Sony headphones. Frequency response is 18-22000Hz.
atolonen on 14/6/2006 at 09:43
17000 was the highest I could hear with good earphones (Sennheiser MX 500 earbuds) without turning the volume way up. I guess my ears are pretty banged up because I listen to music almost all the time when I'm awake - including 8 hours with earphones at work. A funky thing is that I could hear 24000 sample very clearly, but the sound was not as high as I'd imagine 24k being. Maybe I just heard some lower harmonics of the signal.
I'll have to try these files when I get home and see if I notice a difference with my Sennheiser HD 555 cans and Fostex PM0.5 nearfield monitors. Both of these are hifi / studio quality equipment (I am a musician with a home studio you know).
This is also highly interesting: (
http://en.wikipedia.org/wiki/Holophony) Holophony. Listen to the example on the site with headphones and prepare to be amazed.
David on 14/6/2006 at 10:19
It's the second link in the thread.
PigLick on 14/6/2006 at 10:47
this kinda shit makes me wanna invoke piglicks rule again. Fuck I am sure we all read news sites.
Phydeaux on 14/6/2006 at 10:56
That's kinda cool. Not just left/right, but also some front/back, even though it's just 2 channel stereo. Somehow I think it has more to do with brain interpretations/expectations than the actual recording. If you listen to Frank Zappa's
Overnite Sensation or
Apostrophe(') albums, you can hear quite a lot of the same sort of thing. On some lyric phrases there's the slightest bit of delay from one channel to the other so instead of hearing a centralized sound, like from the middle of your head, you hear it as though it's from far outside your head on both sides. Pretty cool effect. Probably the best examples are on "Camarillo Brillo", "Stinkfoot", or "Cosmik Debris".
Matthew on 14/6/2006 at 10:59
Quote Posted by PigLick
this kinda shit makes me wanna invoke piglicks rule again. Fuck I am sure we all read news sites.
Yeah, I'm going to have to cut down on that. Sorry.
Scots Taffer on 14/6/2006 at 11:46
I can hear all of them, by the way.
Para?noid on 14/6/2006 at 12:38
1. The reason why this might be hard to hear on speakers is because you're not in the right spot, and so phase cancellation is occuring. The example is a sinusoidal tone, and the time-domain waveform is identical on both channels. You need to get central to that the phase of the two channels is aligned.
2. If you can't hear it, turn your speakers / phones as loud as possible. Human hearing sensitivity doesn't "cut off" at a certain frequency, it rolls off exponentially and there's a chance you can hear it at higher decibels.
3. You can't hear above 20,000. Don't bullshit yourself; the basiliar membrane doesn't physically support it, and your brain doesn't know particularly what to do with it. You'll notice that very high frequencies are "felt" rather than heard because of the organic nature of perception as the frequency leaves your field of experience.
Additionally, I expect most of you have an audio system that processes at 44100 samples per second. The Nyquist theorem states that signals containing a frequency over HALF the sample rate cannot be reproduced and as a result, a lowpass filter is inherent in all systems to stop "aliasing" from these higher frequencies. In this case, no frequencies above 22050 Hz.
Aaaaand what's more the the examples in the Ochen K. link are actually badly done; there's lots of "spectral leakage" going on which is probably what you think is the sound, but isn't - I can't really work out what it is, but it looks like the kind of sidebands you find when doing FM synthesis. Essentially it's foldover, but that shouldn't be the case due to filtration. Fuck knows.
Hier on 14/6/2006 at 12:43
A buddy of mine has a weird hearing disorder that affects sound within a certain frequency range that's usually in the middle of the range most humans can hear. It's very strange because he can hear sound on either side of the range just fine. I suppose it's the auditory equivalent of being colourblind.
Anyway, the amusing part is that it's the frequency range that encompasses most female voices. The doctor told him he should consider himself lucky. :D
