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Posted by Martin Heffels on 10/05/60 11:53
On Tue, 11 Jul 2006 01:01:23 GMT, "PTravel" <ptravel@travelersvideo.com>
wrote:
>The patent office? Sorry, but people can put whatever they want in a
>patent
I am reading the claims by Matsushita and Sony.
>-- the USPTO doesn't vet patent specifications for accuracy.
Of course not, their peers or the consumers will do that.
>Moreover, the question isn't "bit error rate," but "uncorrectable error rate
>as applied to dv tape."
No, the original question was about bit-perfect copy. Uncorrectable errors
were later introduced into the thread.
[...]
>> It is very hard though to find any sensible figures on it.
>
>Well, that's odd. If generational loss for DV copying was an issue, I'd
>expect to see lots written about it, just as I see lots written about
>generational loss for analog video. Instead, all I can find is sources that
>say there is no generational loss for video copying.
But that is the whole point. The error correction, muffling away all the
faulty bits, make it look like it is no concern, so nobody worries about
it. It is a statistical exercise. And that says, yes, there are drop-outs,
they can all be corrected, but not all of them "correct to the bit".
>> I have read an
>> article about it in an SMPTE-magazine, but their magazines are not online
>
>SMPTE is, of course, a reliable source of data. Did the article say that
>copying digital video tape commonly results in data loss due to
>uncorrectable errors?
Yes. I hope I can somehow find a reference again, because I the
SMPTE-magazines are only 10800km away from me :-)
cheers
-martin-
--
"If he can he'll smile 'cos he's a Royal Crocodile."
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