As far as I can tell, ultrasonic atomizers run around 30 to 40 kHz and this should be similar (there might be important differences I'm not thinking of though). And a dog's range of hearing is generally considered to be up to around 45 kHz.

So, to answer your question, I have no idea.

Vimeo is better, but it's still pretty low. I'd like for their bitrates to be at least double what they are right now. 4x would be ideal, but I know even 2x is asking a lot.

For instance, the "Posing and Rendering CGI Characters" video from Filmmaker IQ:

Youtube 720p - 782 kbps video (44 khz 125 kbps audio / 178MB file)
Vimeo 720p - 1,077 kbps video (48 khz 256 kbps audio / 135MB file)

Youtube 1080p - 1,474 kbps video
Vimeo 1080p - 2,545 kbps video

Also, if downloads are enabled for the video on Vimeo you can download the original file, which looks like this:

Vimeo 1080p original - 10,100 kbps video. (1.35 GB file)

15.5 kHz @ 48, though there was an undertone that continued longer. I guess I'm not a teenager any more.

It's a pretty good test of my cheapo Logitech computer speakers as I got the same result with fairly high-specced headphones.

It's been tested and the "best" audiophiles can't hear differences between 14bit and 16bit, nor can they hear differences between 44.khz and ANYTHING higher. In some tests they could use12bit sound with 36khz sampling frequency... The differences they hear are inside their head. Thus the description of improved sound is always "air", "brilliance", "organic" etc.. Don't be fooled by their fancy gear, most of it is for nothing. Cables: i am always willing to bet my months salary on doubleblind tests, 10 000€/m against a coat hanger, no audible differences.. It's all about confirmation bias, you think there's a change and suddenly you hear it.

About MP3s vs PCM:
Here we have audible differences. But. Put on high enough energy, ie turn your amp high enough, suddenly double blind studies can't find which is which. But it can be audible, mp3 is lossy format and even 320kbps can be heard. Not with all material, it's about in the limits of human hearing. Some might hear high end loss, if you're in your twenties. Once you hit 40, everything above 17khz is gone, forever. You will never hear 20k again. And to really notice the difference, you need good gear. Your laptop earphone output most likely won't even output anything past 18khz well and it's dynamic range can be represented with 8bit depth.. It can be just horrible. Fix that with usb box, around 80€: you can take that box anywhere on planet to the most "hifiest" guy out there and he can't hear the difference between his 10000€ A/D converter.. In fact, 5€ A/D converter can produce the same output as 3000€ one... That's not why i said buy a external.. It's more to do with RF and other shielding, protection against the noises a computer makes than A/D conversion quality. Note, i'm talking about audible differences, you can find faults with measuring equipment and 95% of the gear price is about "just to be sure".

If you want a good sound, first, treat your room. Dampen it, shape it.. If you spent 10k on stereo and 0 on acoustics, you will not have a good sound no matter what you do. Spend the same amount on acoustics than what you do on you equipment, room makes a lot more differences than gear. Next comes speakers, they are the worst link in the chain by a large margin. Quality costs, still wouldn't go to extremes here either, the changes are again "just to be sure", not always audible.. Then amps, beefy, low noise, A/B. You don't need to spend a huge lot of money but some. Then cables.. Take the 50€ version instead of 300€ or 3000€. Build quality and connectors, durability. Those are the reason to buy more expensive than 5€. Not because of sound quality.. There will always be group of people that will swear they can hear the differences, that's bullcrap. Human ear CAN NOT detect any chances, even meters are having a REALLY hard time getting any changes. You need to either amp up the signal to saturation point, or use frequencies in the Mhz ranges, thousands of times higher than what media needs to get any changes between cheapest crap and high end scams.

Audiophiles can't be convinced they are wrong, they are suffering from the same thing antivax people do: give them facts, they will be even more convinced they are right.

Thanks for the reply and sharing your expertise -- sounds like you'd confirm everything that the video said.

This probably just displays my ignorance more, but specifically with regards to the MP3 format, do you think it adds any noticeable compression artifacts even at high-quality settings? Part of my problem was that I was thinking of MP3 *bit*rate as sampling rate (128 kbit/s = 128 kHz, which is not at all correct). But still, MP3 is a lossy format (obviously since one can turn a 650M CD into ~60M of 128k MP3s, or still a large filesize savings even for 320k) and even my relatively untrained ear can sometimes hear the difference at low (say, 128k or lower) bitrates.

I guess that a music producer wouldn't record/master anything in a compressed format like MP3, so that is sort of entirely separate from the point of this video and your comment. But just out of curiosity, do you think that people can detect differences between a 16 bit 44 kHz uncompressed digital recording (flac maybe?) and a very high quality MP3 (say, 320 kbit)?

Going from 16 bits, to 24 bits will lower the noise floor which, if you have the audio turned up enough, you can hear it ever so slightly. It's not a huge difference and you're not going to hear it in a typical song. It's definitely there, but it's already insanely quiet at 16 bits. An "Audiophile" on pristine gear may notice the slight change in hiss in a moment of silence, with the speakers cranked up - but that's about it.

As for pushing up the sampling rate, when you get beyond 44.1kHz, you're not really dealing with anything musical anymore. All you're hearing, if you're hearing it at all, is "shimmer". or "air". It sounds "different" and you might be able to tell which is which, but it's one of those differences that doesn't really matter in effect. A 44.1khz track can still make ear-piercingly high frequencies - the added headroom just makes it glisten in a really inconsequential way.

This is coming from 17 years of music production. I've gone through all of this, over and over again, testing myself, trying to figure out what is and isn't important.

At the end of it all, I work on everything in 16bit 48kHz - I record audio files in 24 bit 48 kHz - then export as 16 bit 44.1kHz. I don't enable dither anymore. I don't buy pro-audio sound cards anymore. I don't use "studio monitors" anymore. I just take good care of my ears and make music now.

It is NOT impervious you stupid fucks. Learn some physics. First of all, EM frequencies over a few (tens?) of kHz can go right through this faraday cage.

Also this high voltage might also easily penetrate the chicken wire. The thing is that the path to ground is less resistance to follow the chicken wire then to go past it. If you had a huge grounded copper wire on the other side of the chicken wire it would go right "through" it to the wire in your hand.

In fact it appears the chicken wire doesn't even need to be there, all the arc'ing is to the large metal rods that support the cage. The chicken wire probably isn't doing jack shit.

Finally, it isn't even a faraday cage, because I see hige gaps between the two horizontal support rods.

Stupidest title ever.

30 hz to 13 khz.

The audio is a representation of radio frequency signals measured at Saturn. The RF signals are described as 'kilometric' - which means wavelengths around a kilometer. This means they have a frequency around 300 kHz (on the lower side of AM radio) - since the speed of light is 300,000 km/s - i.e. a 1 km wave goes by at a frequency of 300,000 times per second. To let us hear the patterns in the signal, they shifted these RF signals down by a factor of 30 or so, and converted them to sound - around 10 kHz.

These RF signals are due to the motions of charged particles (electrons and protons) trapped in the magnetic field of Saturn. As the particles cycle back and forth along the magnetic fields, they move at different speeds and spread out, with different frequencies coming at different times. Converted to sound, it becomes these eerie tones.

The giant planets have very large magnetic fields. The charged particles come from the Sun, and also interact with the moons and rings. Jupiter has an even more powerful magnetic field, and radio bursts indicate that lightning bolts jump the space between Jupiter and the inner moons.

Here is a video that shows a model of Saturn's magnetic field.
The video must be correct, since the narrator has a british accent.
http://videos.howstuffworks.com/hsw/23337-saturn-composition-and-magnetic-fields-video.htm

Very interesting, but badly edited video, some of the explanations were on screen much too short.
I blogged about high frequency tones some time ago.
If you want to hear to how many kHz your hearing goes, you can check it out on this ringtone site:
http://www.freemosquitoringtones.org/
These ringtones are used by kids so they can hear their phone in class for example without the teacher hearing it.
Depressingly enough these high frequency tones are also used as an areal denial system in some areas in my country and others where they don't want youngsters hanging around. Very annoying and an infringement on liberties if you ask me.

http://en.wikipedia.org/wiki/Earthquake_light
http://www.louthleader.co.uk/news/More-earthquake-light-sightings-.3864580.jp
http://inamidst.com/lights/earthquake



"It is perfectly practicable to transmit electrical energy without wires and produce destructive effects at a distance. I have already constructed a wireless transmitter which makes this possible, and have described it in my technical publications, among which I may refer to my patent 1,119,732 recently granted."
- Tesla


"t's 7:17 AM on the morning of June 30, 1908, the exact moment when Nikoli Tesla is testing his "Death Ray" by aiming his beam towards the Arctic Cirle where he hopes Admiral Peary will see a visual display in the sky.

In the small Siberian village of Tunguska, herders of Reindeer are awoken by a huge ball of light, followed by an enormous explosion."
- http://www.viewzone.com/tesla.tunguska.html



"However, he did hear about the unexplainable event in Tunguska, and was thankful no one was killed, as it was clear to him that his death ray had overshot. He then dismantled his machine, as he felt it was too dangerous to keep it."
- New Scientist October 2002



"On 31 March, 1980, anomalous EM emissions were recorded thirty minutes before a deep-focus (depth = 480 km) magnitude 7 earthquake 250 km from an observatory near Tokyo. These emissions were widely-separated at 10 Hz and 81 kHz. Other similar emissions were recorded for a magnitude 7.4 earthquake in Iran, 1200 km from the epicentre, at 27 kHz and 1.63 MHz. Other examples of such emissions have also been reported."
- Chris A. Rutkowski "The Tectonic Strain Theory of Geophysical Luminosities"

I've taken my upper-end at work before, in a sound proof room, and could follow with good detection accuracy up to 17.4 kHz (labmates typically maxed around 16.8... I win).

The lower end is highly dependent on the speaker, and tactile detection of vibration at very low frequencies can be confused for hearing. The upper end is also speaker and background dependent. If anything I thought this ramp test might show people where they have 'notches' in hearing: frequency ranges where they have hearing damage in one or both ears. BUT, with this poorly compressed recording on my cheap Monsoon pc speakers there were all sorts of fades and rises in amplitude.

I wouldn't use this to test hearing, or even test speakers, but it was fun rumbling around on the low end.

25ish Hz to 14 kHz here. It's scary though because for me I notice certain freqs dropping in and out really quick depending on the ear.

Here's a really interesting set of audio tests:http://tonometric.com/rhythmdeaf/

40 hz to 13 khz. Drops out between 10-11 khz here as well.

30 hz to 13 khz.