begin quoting Tracy R Reed as of Fri, Nov 18, 2005 at 04:36:19PM -0800: > Stewart Stremler wrote: > > I thought it was jitter? I thought the ear could handle dropouts, but > > time-variance turned it all into noise? > > True, jitter can be a problem also. Usually you digitize and send in > 20ms packets or 50 per second. So you may not notice a few dropped > packets, especially if they don't all happen at once. And normally if > packets arrive out of order they are dropped. There might be algorithms > for trying to smooth over dropped packets, I'm not sure. But VOIP > implementations can and often do try to measure latency and implement a > jitter buffer. It adds a bit of latency depending on how big the buffer > is but it works similar to a buffer on a CD player (remember CD players > and skipping?) so that by adding a little delay the buffer can put > packets back in order and play them at a continuous speed so the ear > does not hear any errors. But if latency varies too widely (jitter) the > buffer could run out or overflow and cause drops. > > > Do I have that backwards? > > You have it right. I just expounded a little more above for the benefit > of others. > > > /me thinks of _Ender's Game_ > > Oh, to have faster than light transmission capability... But I would > settle for having a pair of entangled particles. Imagine if we could
I haven't been keeping up on my reading about entangled particles. The "spooky" part of 'spooky action at a distance' was supposedly FTL, wasn't it? > construct point to point links to anywhere in the universe by just > meeting up with a friend, exchanging entangled particles, and keeping > our collection of entangled particles with us wherever we went. Instant > fast, unstoppable, and unsnoopable bandwidth. Sure, there would still be > lightspeed latency, but you it would be one heck of a p2p network. Much simpler to simply generate a one-time pad. Entangled particles have to be kept safe from the rest of the universe so they don't decohere on you. "What we chiefly need..." A good source of random noise and a DVD burner... and some simple software to keep a database of what bits you've used... most of the actual work would be in the management side of it. ...but then you're back to the killer problem of cryptography - key distribution. Entangling the particles comes in here. (This would actually be a fun project to do. Which means it's probably already been done with someone with more spare time than I seem to have...) -Stewart "And a good source of real randomness." Stremler -- [email protected] http://www.kernel-panic.org/cgi-bin/mailman/listinfo/kplug-list
