Music file compressed 1,000 times smaller than mp3
April 1, 2008Researchers at the University of Rochester have digitally reproduced music in a file nearly 1,000 times smaller than a regular MP3 file. The music, a 20-second clarinet solo, is encoded in less than a single kilobyte, and is made possible by two innovations: recreating in a computer both the real-world physics of a clarinet and the physics of a clarinet player.
The achievement, announced today at the International Conference on Acoustics Speech and Signal Processing held in Las Vegas, is not yet a flawless reproduction of an original performance, but the researchers say it's getting close.
"This is essentially a human-scale system of reproducing music," says Mark Bocko, professor of electrical and computer engineering and co-creator of the technology. "Humans can manipulate their tongue, breath, and fingers only so fast, so in theory we shouldn't really have to measure the music many thousands of times a second like we do on a CD. As a result, I think we may have found the absolute least amount of data needed to reproduce a piece of music."
In replaying the music, a computer literally reproduces the original performance based on everything it knows about clarinets and clarinet playing. Two of Bocko's doctoral students, Xiaoxiao Dong and Mark Sterling, worked with Bocko to measure every aspect of a clarinet that affects its soundfrom the backpressure in the mouthpiece for every different fingering, to the way sound radiates from the instrument. They then built a computer model of the clarinet, and the result is a virtual instrument built entirely from the real-world acoustical measurements.
The team then set about creating a virtual player for the virtual clarinet. They modeled how a clarinet player interacts with the instrument including the fingerings, the force of breath, and the pressure of the player's lips to determine how they would affect the response of the virtual clarinet. Then, says Bocko, it's a matter of letting the computer "listen" to a real clarinet performance to infer and record the various actions required to create a specific sound. The original sound is then reproduced by feeding the record of the player's actions back into the computer model.
At present the results are a very close, though not yet a perfect, representation of the original sound.
"We are still working on including 'tonguing,' or how the player strikes the reed with the tongue to start notes in staccato passages," says Bocko. "But in music with more sustained and connected notes the method works quite well and it's difficult to tell the synthesized sound from the original."
As the method is refined the researchers imagine that it may give computer musicians more intuitive ways to create expressive music by including the actions of a virtual musician in computer synthesizers. And although the human vocal tract is highly complex, Bocko says the method may in principle be extended to vocals as well.
The current method handles only a single instrument at a time, however in other work in the University's Music Research Lab with post-doctoral researcher Gordana Velikic and Dave Headlam, professor of music theory at the University of Rochester's Eastman School of Music, the team has produced a method of separating multiple instruments in a mix so the two methods can be combined to produce a very compact recording.
Bocko believes that the quality will continue to improve as the acoustic measurements and the resulting synthesis algorithms become more accurate, and he says this process may represent the maximum possible data compression of music.
"Maybe the future of music recording lies in reproducing performers and not recording them," says Bocko.
Source: University of Rochester
2 hours ago
Not even close, the absolute least amount: instead of clarinet focus on synthesizer generating a pure tone and then you can represent such 'music' by just one number - frequency
How about attending to something significant... increasing quit-smoking success, avoiding obesity... shut up Mike
Think of it this way: Which is more manageable for an online computer game (for example)? Sending out a model of a monster, along with textures and animations(maybe 5 megs altogether), or sending out a small databurst containing what essentially amounts to the "DNA" of the model, its textures, and its animation, and then letting the computer on the receiving end reconstruct the end result from scratch (maybe 5kB altogether)?
As we shift to using the web to deliver media information it will become more important to reduce the size of that information by any means at our disposal. Obviously procedural generation of music or video based on a small amount of data takes a huge amount of processor power. But in some situations using processor power is preferable to clogging a network with huge files.
Current compression technology teeters on the edge, trying to never require more processor power to decompress itself than what the "average" user has. But as processor power becomes greater over time we will be able to make use of more and more advanced compression and procedural generation technologies, like this one, which will allow us to (and ISPs, who are the only ones who really have a vote) to send far greater amounts of information over the same network, without undertaking as many expensive upgrades.