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Posted by PTravel on 10/05/91 11:52
"Richard Crowley" <richard.7.crowley@intel.com> wrote in message
news:e8ucis$8o5$1@news01.intel.com...
> "PTravel" wrote ...
>> We're still talking about apples and oranges -- data reconstructed using
>> ECC is accurate and bit-for-bit what was recorded (or supposed to have
>> been recorded).
>
> No. That is the description of how ECC works for computer
> data. There is another MAJOR error recovery layer used by
> audio CDs, DVDs, DVD tape, etc. It is how they manage to
> be cost effective.
>
> Audio/video data that cannot be accurately *corrected* gets
> *mitigated* by extrapolation. This is the factor that is present
> in audio and video digital recording but NOT in computer data
> recording. It probably comes into play more often than we think,
> but if it is good enough we don't notice. But multiple repetitions
> of it amount to something approaching "generation loss".
Can you site me to something that says how often this happens? I've never
heard of DV video transfers being described as anything other than lossless.
>
>> Replacing pixels (or scan lines or averaging blocks) results in lost
>> data.
>
> I think you have that backwards. Replacing pixels, etc. is one
> of the major migitating actions taken as a result of lost data.
I meant that the resulting data is not the same as the original, hence there
is data lost. But how often does this happen?
>
>
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