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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]Re: [tlug] Audio CD Issues
- Date: Sun, 20 Mar 2005 14:02:31 +0900
- From: "Dmytro Koval'ov" <dmytro.kovalov@example.com>
- Subject: Re: [tlug] Audio CD Issues
- References: <423CFBA8.1010105@example.com>
On Sun, 20 Mar 2005 13:27:20 +0900, Lyle (Hiroshi) Saxon <ronfaxon@example.com> wrote: > with current digital video formats) and it seemed apparent that the > method of video tape "copy-guard" was simply to damage the video signal > so that it was just barely within what the corrective circuitry of > televisions could correct. Thus, when you copied the tape, the signal > fell below the threshold of correctable errors and you got a heavily > damaged signal. In the case of originally made tapes out of my cameras > (four of them, all of which burned out with distressing speed and > regularity), the picture went from looking great to crummy in just one > generation (unavoidable with analogue editing). Your impression about analog copy protection is wrong. There isn't any correcting circuitry in television. On the opposite, there's a "damaging" circuitry in any produced recently analog video device (tape recorder, analog to digital converter etc.) It's licenced by MacroVision and it's purpose is exactly this -- to damage video signal when it detects some "special frequency", how they call it (I don't know what kind of frequency or signal it is -- never went on to finding details of it). That "special frequency" is added to all commercial tapes (also licensed from MacroVision on a per-tape base). That's why you can't copy them. You won't be able to copy DVD's on analog device exactly for the same reason -- they have MacroVision protection. But you can copy your own tapes, because that frequency is not added to them. Of course quality degrades with each copy of a tape (and also ith each viewing), but that's different issue. --Dmytro
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