On Sun, Jan 18, 2004 at 02:05:02PM -0800, Nano Nano wrote: > On Sun, Jan 18, 2004 at 04:56:53PM -0500, Bijan Soleymani wrote: > [snip] > > > > Yes all the channels and the traffic are coming on the same wire. Each > > channel is at a different frequency (kind of like for regular antenna > > reception), and the tv picks out whichever channel you want. > > Could a device in theory record every channel simultaneously? Sure you just need to tune in to a wider range of frequencies. > Could it in practice? Let's assume there are 100 channels. That means that if you wanted to do it with analog technology, VHS, you'd need 100 times the capacity. Either 100 tapes in parallel (imagine having to synchronize 100 VCRs), tape rolling at 100 times the speed (tape would wear out, each tape would last 2 minutes instead of 2 hours, etc), tape 100 times as wide (lol, just try to imagine that), or a combination of each (twice as wide, ten times as fast and five in parallel),or of course a better technology. If you were doing it digitally, mpeg capture, then you'd need a tuner per channel each capturing at about 1 mbit/s. So that's about 100mbit/s or about 8 megabytes of video per second. That's not too bad, except you'd have to fit in 100 mpeg encoders into the system (not that unreasonable). You might be able to record the whole thing on a computer with a generic Digital to Analog converter, split it up in software and then reencode in mpeg, don't know how much processor power / bus bandwidth that would take. So the answer is yes it's possible but it probably woulnd't be trivial. Bijan -- Bijan Soleymani <bijan@psq.com> http://www.crasseux.com
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