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Posted by Rick Merrill on 07/11/06 23:20
Martin Heffels wrote:
> On 11 Jul 2006 14:58:20 -0700, "Mr. Tapeguy" <mr.tapeguy@pro-tape.com>
> wrote:
>
>
>>I got literature indicating similar ratings for Panasonic but no one
>>could tell me what the measuring unit for the 50-100 dropouts is.
>>
>>Based on analog tape such as 3/4" which used to be rated at maybe 5-6
>>per minute I cannot believe that they would actually make a product
>>that might average 50-100 dropouts per minute. Number one it would be
>>crap - moving WAY backward on the technical achievment timeline and I
>>while I'm no engineer I can't imagine how any kind of error correction
>>could handle that many dropouts.
>
>
> No it isn't crap. It turns out that the errors can be corrected quite well
> without us noticing it. A big difference is obviously tapesize and
> tapespeed, and undoubtly the headsize as well, which makes the amount of
> drop-outs on mini-DV much much higher.
>
> cheers
>
> -martin-
besides, 50-100 dropouts per minute
divided by 25 Mbps x 3600 sec per min is an average
of 0.00000008 percent! (pretty damn good error rate!)
If you want reliability use "transport MPEG protocol" which contains
extra error correction codes.
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