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SeraRelm
besides audible range, there can still be vibrational sensory input via touch.
Yes, that's what I (she) said.
Yes, that's what I (she) said.
Minor victory thread
- Thread starter Thread Necromancer
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I love spicy food as do most people I know, so I'm confused.
figmentPez
Staff member
I've heard something about those higher frequencies interacting with echoes and other ambient effects, kind of like the argument against compressed audio (you don't hear it directly, but indirectly), but I'm not sure how much I buy it.
It must be where I've lived. Most of my co-workers freaked whenever I brought something even moderately (to me) spicy for them to try.
I must have worked with a bunch of wusses.
I'll send you some of my jambalaya. Let me know what you think.
Love spicy food as well. Most of my family does. I cook with Jamaican jerk often, and when I'm not using that I'm using jalepenos/ (Or thai red peppers if I can get them) and sriracha.
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SeraRelm
Fixed to make me laugh.I just had awkward, barely satisfactory sex. Now I feel like a teenager again.
Maybe not but it should be a good place to make contacts that could help you with your future career.I got inducted into Psi Chi today. I'm only putting it under minor because all you need is a 3.4 or higher GPA in your psych major and 40 bucks
While kinda cool, I don't know if it's something that grad schools are going to be wetting themselves in anticipation about me attending their schools about.
fade
Staff member
You know I wrote that while I was boxing up a mother's day gift, and I take it back. Where you'll really hear the difference will be in sharp, short duration things like drum beats and high hats. Those things contain frequencies beyond human hearing, but many frequencies are required to produce sharp events.
Yeah, that. Harmonics/overtones and their interplay combine to add a lot (something called the Nyquist frequency, I think...the auditory equivalent of Moiré patterns). And I'm pretty sure there's something about digital audio having a hard time accurately reproducing frequencies higher than 1/4 the sample rate.
See, you already get hard-limited to 1/2 the sample rate since 44kHz just really means it can "hear" oscillations (peak-to-trough-and-back-again) as high as 22kHz. Anything higher than 22kHz gets lost because it simply transitions faster (high-low-high) than the sampler can detect and so is completely lost.
On top of that, as the frequency being recorded gets higher and higher, the resolution goes lower and lower since the sample rate is linear across the band, but frequencies are logarithmic, doubling at every octave. Basically, this means that the higher the frequency goes, the more distorted and "stair-step" the waveform will become (no matter what its original envelope might've been), until, at 22kHz, everything collapses to some form of square wave, simply because it would be impossible to be anything else. Think of it like running a video game with AntiAliasing turned off. The lower your screen resolution, the more likely you are going to be able to notice the "jaggies" along the edges. Increasing the sample rate to 96kHz is like moving your game from a 1280x768 monitor to 2560x1536...it means that you now get no noticeable auditory "jaggies" all the way up to 24kHz (96/4=24), which is something you really notice* when you listen to music that has a lot of highs in it (cymbals, trumpet, oboe, violin, or most of all, pipe organ).
tl:dr; CDs are great for bass and anything else up to about 11kHz, but there's a good reason that rabid audiophiles aren't happy with them.
--Patrick
*Seriously. You'd notice. You might decide you don't care, but you'll definitely hear the difference.
fade
Staff member
Well, the Nyquist frequency is just the frequency that can be correctly reconstructed at a given sampling rate. The Nyquist frequency was the grounds for choosing 44.1 kHz in the first place, because it's defined as 1/2 the sampling rate. I'm not sure what you mean by "frequencies are logarithmic". Certainly they double at every octave, but that's the definition of octave. Notes are logarithmic, but not frequencies in general. The sample rate is linear across time, but it's continuous in the frequency domain from DC to 22.05 kHz. The ADC doesn't operate in the frequency domain. Whether high frequencies get clipped into square waves depends on the reconstruction software in your player. A DAC should interpolate onto a sine wave, which would mean that it should be able to exactly represent the 22.1kHz wave (but no more). That is the Nyquist theorem. It shouldn't alias at all. It shouldn't remain blocky. In the video game analogy, you're saying that you know what the edge of a curve looks like, you just took the min number of points required to represent it. If you drew that curve by connecting those samples, sure, it'd be a square wave (like a computer graphic). But the DAC works by assuming it knows what the curve looked like, and it uses the points you provided to reconstruct the curve exactly--up to the Nyquist frequency. This is the way a DAC works in your typical data recorder. Whether your standard CD chip does this, I'm not sure.
A different graphics analogy would be vector graphics. You can represent a circle as three points. If you try to connect the dots, you'll get a triangle, which of course a terrible representation of a circle. But if you know that the dots represent a circle, those three dots should be sufficient to reconstruct the circle exactly. Any less than three dots (below the Nyquist), and you couldn't do it.
If your player is directly playing the digital waveform, then sure. I very much agree that sharp sounds, which include things like the hard edge of a brass note or a high hat will certainly sound better at 96 kHz. The sharper the sound is, the more frequency content it contains. That goes a long way to improving the sound of a piece of music. People tune into that as a quality indicator. So yes, I agree that on those grounds, it will definitely sound better. I totally acknowledge that, to be clear.
TL;DR: Agree that 96 kHz should sound better, disagree that a player with a proper DAC chip can't play 22.05 kHz without alias.
I should say this is what I do for a job. I actually taught signal processing for about 6 years. First in EE, then in geophysics. I actually just spent a few months investigating applying the MP3 method of preserving/recovering high frequencies in seismic data.
A different graphics analogy would be vector graphics. You can represent a circle as three points. If you try to connect the dots, you'll get a triangle, which of course a terrible representation of a circle. But if you know that the dots represent a circle, those three dots should be sufficient to reconstruct the circle exactly. Any less than three dots (below the Nyquist), and you couldn't do it.
If your player is directly playing the digital waveform, then sure. I very much agree that sharp sounds, which include things like the hard edge of a brass note or a high hat will certainly sound better at 96 kHz. The sharper the sound is, the more frequency content it contains. That goes a long way to improving the sound of a piece of music. People tune into that as a quality indicator. So yes, I agree that on those grounds, it will definitely sound better. I totally acknowledge that, to be clear.
TL;DR: Agree that 96 kHz should sound better, disagree that a player with a proper DAC chip can't play 22.05 kHz without alias.
I should say this is what I do for a job. I actually taught signal processing for about 6 years. First in EE, then in geophysics. I actually just spent a few months investigating applying the MP3 method of preserving/recovering high frequencies in seismic data.
fade
Staff member
You know what? I stand partially corrected. I just looked up the typical DAC in an audio player. It IS voltage-hold. Meaning it doesn't reconstruct or interpolate, it just turns every sample into a level voltage, which would turn 22.05 into a perfect square wave. Still a good upconverting player is probably interpolating and upsampling before the DAC.
I never qualified when I was an undergrad. I can still join, though! I may someday...I got inducted into Psi Chi today. I'm only putting it under minor because all you need is a 3.4 or higher GPA in your psych major and 40 bucks
While kinda cool, I don't know if it's something that grad schools are going to be wetting themselves in anticipation about me attending their schools about.
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SeraRelm
figmentPez
Staff member
That's almost the same story here. For weeks our internet had been fluctuating wildly. Some days it would be fast, and other days even the lowest quality Youtube videos would buffer. Checked and found our modem was "end of life", and since we've replaced it everything has been super-fast.
I have just put a down payment on an apartment to call my own.
It's not the nicest place- it's a basement- and it's not really, TECHNICALLY still in Toronto (It's right by the airport, and technically part of Mississauga. It's basically right on the border of Brampton, Mississauga and Toronto).
But it's CHEEEEEEEEEEEEEEEEEEEEEAP and spacious, and it's all mine. I've been graduated from college for over a year now but since September I have just been crashing at friends' places, which doesn't do much to make me feel very successful. I'll finally have a space to myself come June. I'd rather live in Peter Parker's apartment from the second Spider-Man movie than continue to impose on my friends like this, so this is a huge step up.
It's not the nicest place- it's a basement- and it's not really, TECHNICALLY still in Toronto (It's right by the airport, and technically part of Mississauga. It's basically right on the border of Brampton, Mississauga and Toronto).
But it's CHEEEEEEEEEEEEEEEEEEEEEAP and spacious, and it's all mine. I've been graduated from college for over a year now but since September I have just been crashing at friends' places, which doesn't do much to make me feel very successful. I'll finally have a space to myself come June. I'd rather live in Peter Parker's apartment from the second Spider-Man movie than continue to impose on my friends like this, so this is a huge step up.
I broke down 2 sever racks from 1998.
I received no satisfaction of that kind.
We're finally getting rid of our old server racks too. They aren't really server racks, but 2 networking racks set up so it could be used like a server rack. Except the mounting equipment for most servers didn't work in it. Damn I'll be happy to get rid of that thing.
My wife, who usually "tolerates" my gaming with an eyeroll and maybe a comment or two about "the other woman," is currently playing Skyrim. And making comments like "What? Bitch, if I want your man, I'll TAKE him!"
Dear Lord, what have I done. *grins nervously*
Dear Lord, what have I done. *grins nervously*
Thanks to Squidman, I have managed to get my Minecraft server to do double duty as a Squid cache. It was surprisingly easy.
--Patrick
--Patrick
Because normally, you get good at something by doing it over and over again until you get good at it. Difficult to do with Life. They're still on their initial run-through. They think they'll be able to min/max later.
--Patrick
