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Physicists Create Quantum Link Between Photons That Don't Exist At the Same Time

fbjon Re:I give... (364 comments)

No information is transmitted, the particles are merely correlated.

Wrong but sufficient analogy: If two balls bounce off each other in some random way and I take a look at one of them, I can tell what direction the other is going. Or if you like, by knowing the input velocities and masses, you can know the velocity of the other ball by looking at just one. The balls don't communicate, but some properties of both are "entangled".

That doesn't mean it's clear what exactly is going on and why it works, just that we're sure that relativity doesn't need crapping on for it to work.

about a year ago

Realtime GPU Audio

fbjon Re:Yawn (157 comments)

Physical modelling in sound generation is decades old, there was lots of interest in it in the 90's with commercial hardware, but it has kind of died down. It's computationally intensive for one, which a GPU can help with, but it's also a bitch to actually use well for most real-world instruments. Bell-like sounds are common and can be quite interesting, wind instruments can be done fairly ok, bowed instruments are a bit meh compared to the real thing or samples.

The novelty is doing it on a GPU which means greater processing capacity, and also doing it in real-time which can be tricky with audio, partially because of latency when transferring data, but also because anything over 15ms is simply to be comfortably usable as an actual playable instrument. If you're just playing something back it's different of course, but then there's no real-time requirement in the first place.

I've made a simple and rather crude analog virtual synth running on a GPU using OpenCL, without any shared memory, that can in a pinch go down to a 1024-point buffer (in stereo) which is about 22ms, though not quite reliably. It's obviously much simple calculations, but it can easily do some thousand oscillators in stereo. The article says a 512-point buffer (11ms) is the smallest that they could make usable, which is pretty good.

I can see it being interesting in a game, different objects have different sounds and so on. Music playback is something else though. I always return to the problem of string instruments: how do you actually create the model, and more importantly the inputs? An actual violin has quite a few parameters that govern the sound. Consider the bow: pressure, angle (leaning), speed, position on the string, tension of the hairs (more tension creates slightly smaller contact area), static pressure on the strings (causing the bow and string to stick and then suddenly unsnap), exact time of contact. You'll have to either record all those from the live performance, I would guess a resolution of maybe 10 to 50ms might be good for some of the parameters, more for others. But then you can also pluck the string, and the strings and body resonate with each other, and even with nearby instruments, and you still have the whole left hand yet to be done.

It also doesn't remove the problem of imperfect speakers. Even if you separate out the instruments on their own speakers, each speaker still needs to reproduce the entire spectrum. And also, a speaker is physically a much smaller sound source than a large wooden resonator like a cello, which makes an acoustical difference.

In short, it's very cool but not a revolution. But also don't quote me on that.

about a year ago

New Pope Selected

fbjon Re:So.... (915 comments)

Religious teachings don't really affect population growth at all. At least not today. Religions and babies

about a year and a half ago

The status of Java on my machine:

fbjon Another missing option (201 comments)

I deal with Scala on the JVM every day, but Java (the language) only intermittently.

about a year and a half ago

Favorite U.S. Political Party

fbjon Re:Depends (503 comments)

Are they necessarily different? Consider, hypothetically:

"Republican in principle but holy fuck what happened with them!?"

about 2 years ago

Former Facebook Employee Questions the Social Media Life

fbjon Re:Fakebook (171 comments)

I don't think it's anything special. Make a list of people who have friends in common with you, and sort it by the number of such connections. Keep adding new ones at the top, pushing the older ones that you've ignored so far further down. Seems about the right level of accuracy from what I've seen.

more than 2 years ago

Hollywood Acts Warily At Comic-Con

fbjon Re:Uncanny valley (273 comments)

I see your point, I too sometimes get swept up in films to the point that merely closing the player window can be a jarring experience!

Now perhaps the polished nature of film is more accessible, but I feel the the reality of theatre is just as good, even though I can clearly see the costuming and all that. It's not that they are "just" actors trying to make me believe, they are people, humans, inviting me to take part in the play. That's part of what makes it so good, the line between stage and audience starts to blur, in the way that a good standup comedian and a good audience can work together.

I think it's just a matter of what you're used to, or maybe a particular "skill" in suspending disbelief, looking past the medium and allowing the action to take place. But I don't want to sound like I'm saying that theatre-goers are better, or that one is a better form than the other, so maybe an analogy to sports works here: watching a game on TV is different from watching it in person. You can see more on TV, being there in person can be more intense. Or another one: having someone tell you a ghost story can be just as creepy as seeing it on film, or moreso, or less so. It depends on the way it's done rather than the medium

However, as for film looking more like a stage play, I don't think I would like it. I would love to see a good play of the whole Ring saga, but do I expect to watch a movie if I'm going to the cinema.

more than 2 years ago

Minecraft Map of Northwestern Campus Printed In 3D

fbjon Re:But the trees! (70 comments)

Would a forest with conjoined canopies hold up, or is overhang difficult to handle in this process?

more than 2 years ago

Google Applies For Dot-LOL Domain

fbjon Re:Great... (125 comments)

Controlling the defaults is a lot of control, even if it is nothing like complete control. Internet Explorer tells the story.

more than 2 years ago

Venezuela Bans the Commercial Sale of Firearms and Ammunition

fbjon Re:So.... (828 comments)

If criminals fear for their life, it means everyone fears for their life, and vice versa.

more than 2 years ago

"Open Source Bach" Project Completed; Score and Recording Now Online

fbjon Re:FLAC and MP3 format? (110 comments)

FLAC is already open and Free, no need to make things inconvenient.

more than 2 years ago

Ask Slashdot: Wrist Watch For the Tech Minded

fbjon Re:Wrist watch is for style, not gadget (466 comments)

I'd take it further and say that people appreciate a person with style. It may be that women appreciate it more, but that's just a matter of degree.

more than 2 years ago

Ask Slashdot: What If Intellectual Property Expired After Five Years?

fbjon Re:Logos and trademarks (577 comments)

How do you know if a supplier is trusted?

more than 2 years ago

Ask Slashdot: What If Intellectual Property Expired After Five Years?

fbjon Re:Linux would be public domain (577 comments)

Wouldn't it be more correct to say that some parts of Linux would be in the public domain? If a person contributes today, doesn't that contribution enjoy copyright protection on its own, regardless of the original release by the original author?

more than 2 years ago

Ask Slashdot: What If Intellectual Property Expired After Five Years?

fbjon Re:Logos and trademarks (577 comments)

Should everyone have calorimeters, spectrometers, drop-test rigs, electron microscopes, and other testing gear in their basement to ensure quality? I don't think he's the idiot.

more than 2 years ago

Icons That Don't Make Sense Anymore

fbjon Re:"Old people icons" (713 comments)

Technically speaking, icons are not conventions.

There are in fact two separate things going on here, the floppy disk is an icon representing exactly that: a floppy disk. But it is also a symbol for "save". It does not matter what the image is as long as we agree on it, because the symbol is going to be distinct from what it refers to anyway. Just like words in a language are symbols, distinct from what they mean: the word "tree" doesn't look or sound anything like an actual tree, but we have no more problem with that than with a floppy disk.

more than 2 years ago

Wolfenstein 3-D Celebrates 20 Years With Free Browser-Based Version

fbjon Re:Already done in 4KB of Java (160 comments)

Never mind the level layout in the 4 KB applet: You can't strafe, you can't turn and move at the same time, you can't slide along walls, only one weapon with infinite ammo, slow AI, no running, etc.. It's basically a completely different game.

more than 2 years ago

Fly-By-Wire Contributed To Air France 447 Disaster

fbjon Re:Why do it half assed? (319 comments)

Because GPS gives you the largely useless and confusing ground speed, not the very useful airspeed.

more than 2 years ago

Study Suggests the Number-Line Concept Is Not Intuitive

fbjon Re:Ordered sets (404 comments)

I haven't read the book, but what about subitizing, i.e. the ability to "perceive" a small number of items? If a three-week old baby can subitize up to three objects, I'd say that's an inborn ability.

more than 2 years ago



Bad Backup, Emails Emigrated

fbjon fbjon writes  |  more than 6 years ago

fbjon (692006) writes "Just before Christmas, one of Swedish broadband provider Telia's central mailservers started going wonky, and finally crashed and burned on the 3rd of January. Fortunately, backups are taken regularly. Unfortunately for 300.000 customers, all backups since the 15th of December are unreadable, and cannot be salvaged. The number of mails lost is unknown. All affected customers will receive an email, as well as a 200 euro gift card as compensation.

When did you last verify your backups?"

Link to Original Source

fbjon fbjon writes  |  more than 7 years ago

fbjon (692006) writes "What is your philosophy?
  • Christianity
  • Islam
  • Hinduism
  • Buddhism
  • GNU
  • Not religious/Atheist
  • Intelligent CowboyNeal



Opinion time

fbjon fbjon writes  |  more than 9 years ago Here's what:

For all the trolls, flame and nastiness, slashdot is not all that bad. People complain about trolling, and seem to care whether opinions are somehow genuine or not. I say what the hell. If someone wants to get points on Trollback, hey that's alright! Just stop whining so much, it gets repetitive after a while. Mod troll instead.

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