Post by Sam January 26, 2013 (11 of 13)
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Pre-emphasis is the most successful CD copy protection method ever devised, since 99% of ripped pre-emph CDs are being played wrong. :-)
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Lochiel said:
I believe it was used because the first DAC used introduced some kind of "hum" and it was felt that this would be audible to listeners. Pre-emphasis worked similarly to DoLby NR in that it boosted the musical signal during encoding, then reduced it by several db's during playback. The advent of better DAC's eliminated the need for pre-emphasis generally.
It lifted the HF and, therefore, is not likely to have been implemented to compensate for a "hum.' It is more likely to have been implemented to compensate for a generally high SNR in the range where the ear is most sensitive.
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Sam said:
Pre-emphasis is the most successful CD copy protection method ever devised, since 99% of ripped pre-emph CDs are being played wrong. :-)
Bringing that to a total of what? Long ago, I built a home-made DAC with a pre-emphasis indicator but stopped looking for an indication even though I know it worked with test samples. Not a big issue today.
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