[EMAIL PROTECTED] wrote:
>AFAIK the S/PDIF data has already had error correction or interpolation
>(for uncorrectable errors) applied. So those single bit errors would
>lready be gone by the time the signal reaches the CD player's digital
>output.
For normal digital audio that is the case, but we were talking about
deliberate errors in the CRC bits. The logic will make any corrections and
then pass this corrected data to its DAC and its S/PDIF protocol logic. The
end result is that the outputted data will be incorrect, as will the data
converted by the DAC.
The whole concept is just plain stupid - if it comes to light that the
copy-proofing technique is compromising the data integrity and hence the
sound quality, then it can be deemed unsuccessful and will be rejected by
consumers. Not only is it stopping anyone from making a perfect copy, it is
also stopping us from hearing a perfect reproduction. A copy made using
S/PDIF transfer will also contain the bit errors, but will have correct CRCs
that reflect these bit errors. Playing the copy will give identical results
to playing the original, but different error processing will have occured to
give the same incorrect end result.
I think C-Dilla are having a play with themselves somehow!
-cb
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