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Alicia Keys: did the era of lossy mastering just begin?, Spoiler alert: spectral views included revealing nothing definitive.
Anakunda
post Nov 28 2012, 20:49
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This is snapshot of one of the tracks of accurately ripped original CD with Eac (LOG 100%):



If I'm right this is 1st album mastered from lossy source.


..more snapshots:



This post has been edited by Anakunda: Nov 28 2012, 21:03
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lvqcl
post Nov 28 2012, 21:02
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The lowpass at ~20.5 kHz doesn't necessarily mean that this track was lossily compressed.
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greynol
post Nov 28 2012, 21:04
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I don't see anything in those spectral graphs to conclude with any degree of certainty whatsoever that the album was mastered from a lossy source.

Regarding whether this is the first album mastered from a lossy source, there have been reports in the past.


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Anakunda
post Nov 28 2012, 21:05
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I don't get however why the hard cutoff. Never seen that on CD audio.
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greynol
post Nov 28 2012, 21:07
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I've seen it plenty. There is no issue here.


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Anakunda
post Nov 28 2012, 21:15
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I don't see any good reason for doing this on lossless audio format. Curious what's the point of doing this when the space requirements are exactly same.
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DVDdoug
post Nov 28 2012, 21:54
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As you may know, low-pass filtering is a required part of digitizing (to prevent alaising). And, there are other reasons for filtering during the recording/production process. It's fairly common practice to filter-out the lower frequencies from everything except the bass and kick drum, and to completely filter-out subsonic frequencies. I assume some producers/engineers also like to filter-out supersonic frequencies.

There are no perfect filters so there are trade-offs in filter design. No one can say why a particular filter was used, or why the filter was designed a certain way. The recording/mastering engineer may not know anything about the filters in his ADC or downsampler... He just knows it sounds good or that it has a good reputation.
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C.R.Helmrich
post Nov 28 2012, 23:04
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QUOTE (Anakunda @ Nov 28 2012, 22:05) *
I don't get however why the hard cutoff. Never seen that on CD audio.

Check any CD from the 80s. I don't recall any which does not have this 20-kHz lowpass.

Which in the 80s was due to a conservative lowpass during A/D conversion. In Alicia's album I'd guess it's because they used some analog processing during mixing or mastering (and then some conservative A/D converter for some reason). What scares me are the lines going to 22 kHz. This is solid gold digital waveform clipping.

Chris

This post has been edited by C.R.Helmrich: Nov 28 2012, 23:09


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soundping
post Nov 29 2012, 01:09
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QUOTE (C.R.Helmrich @ Nov 28 2012, 17:04) *
What scares me are the lines going to 22 kHz. This is solid gold digital waveform clipping.

I've found clipping on Third (Portishead album). It's obvious and shocking. ohmy.gif
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