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On 10/18/20 7:56 AM, Mark Fishman [email protected] [EAC] wrote:
> That opens a can of worms. "Real" (i.e., audio hardware) CD players
> are supposed to honor the pre-emphasis flag in the subcode and
> switch on analog de-emphasis during playback.
Several years ago I made a test CD of mixed emphasized/non-emphasized
tracks and assorted correct and incorrect flags to check my various
setups and found that they were all doing what they were supposed to do.
I keep reading rumors that modern equipment will no longer de-emphasize,
but I haven't found that to be the case, even in my car where it
probably doesn't matter as much.
Weirdest empahsis thing I've ever seen is when using a Wandboard as a
Squeezebox player. When booted, it always flags the S/PDIF stream to
tell the DAC to de-emphasise. If you don't remember to run the command
to turn that off, you get dull sound. A friend has a Pioneer (I think)
receiver that even respected the de-emphasis flag in a DTS stream, so it
would properly decode the surround, then dull the highs. Took us forever
to figure out what was going on…pre-emphasis was a sudden “shower
thought” that I was able to test because I've got a copy of the original
US CD of Pink Floyd's The Wall that I keep in both its original
pre-emphasized and SoX de-emphasized versions.
> (I actually once had a CD with pre-emphasis but the flag wasn't set
Brothers in Arms? That one is often cited as probably having that problem.
> I've also had CDs with the flag set but no pre-emphasis actually
> applied.)
I'm not sure that my ear is good enough to be confident of that!
There's a Marc Almond album from *2011* that's pre-emphasized while the
related single is not. And the flag is definitely correct—if you rip
both the single and the album it's from and compare the common track
without correcting the pre-emphasis, the difference is immediately
obvious. No idea what possessed someone to do that so late in the game!
> The problem with pre-emphasized CDs is that EAC cannot apply the
> de-emphasis so you get a bit-perfect rip that still has the overly
> bright highs.
Some file playback setups will deal with that via tags, but I'm a
Squeezebox person and that one won't.
> Ripping to WAV and using something like Audacity to apply the
> de-emphasis to the digital file can give you a good sonic result,
> but it's no longer a copy of the CD..
True, but if you're just playing files anyway I don't think it matters
much. For what it's worth, I find that SoX does the de-emphasis well,
though by doing it in the digital domain it's technically out of spec, I
suppose.
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<p>
<p>On 10/18/20 7:56 AM, Mark Fishman <a class="moz-txt-link-abbreviated" href="mailto:[email protected]">[email protected]</a> [EAC]
wrote:</p>
<pre>> That opens a can of worms. "Real" (i.e., audio hardware) CD players
> are supposed to honor the pre-emphasis flag in the subcode and
> switch on analog de-emphasis during playback.
</pre>
<p>Several years ago I made a test CD of mixed
emphasized/non-emphasized tracks and assorted correct and
incorrect flags to check my various setups and found that
they were all doing what they were supposed to do. I keep reading
rumors that modern equipment will no longer de-emphasize,
but I haven't found that to be the case, even in my car where it
probably doesn't matter as much.</p>
<p>Weirdest empahsis thing I've ever seen is when using a Wandboard
as a Squeezebox player.
When booted, it always flags the S/PDIF stream to tell the DAC to
de-emphasise. If you don't remember
to run the command to turn that off, you get dull sound. A friend
has a Pioneer (I think) receiver that
even respected the de-emphasis flag in a DTS stream, so it would
properly decode the surround, then
dull the highs. Took us forever to figure out what was going
on…pre-emphasis was a sudden
“shower thought” that I was able to test because I've got a copy
of the original US CD
of Pink Floyd's <cite>The Wall</cite> that I keep in both its
original pre-emphasized and SoX de-emphasized versions.</p>
<pre>> (I actually once had a CD with pre-emphasis but the flag wasn't set
</pre>
<p><cite>Brothers in Arms</cite>? That one is often cited as
probably having that problem.</p>
<pre>> I've also had CDs with the flag set but no pre-emphasis actually
> applied.)
</pre>
<p>I'm not sure that my ear is good enough to be confident of that!</p>
<p>There's a Marc Almond album from <strong>2011</strong> that's
pre-emphasized while the related single is not.
And the flag is definitely correct—if you rip both the single and
the album it's from and compare the common track without
correcting the pre-emphasis, the difference
is immediately obvious. No idea what possessed someone to do that
so late in the game!</p>
<pre>> The problem with pre-emphasized CDs is that EAC cannot apply the
> de-emphasis so you get a bit-perfect rip that still has the overly
> bright highs.
</pre>
<p>Some file playback setups will deal with that via tags, but I'm a
Squeezebox person and that one won't.</p>
<pre>> Ripping to WAV and using something like Audacity to apply the
> de-emphasis to the digital file can give you a good sonic result,
> but it's no longer a copy of the CD..
</pre>
<p>True, but if you're just playing files anyway I don't think it
matters much.
For what it's worth, I find that SoX does the de-emphasis well,
though by doing
it in the digital domain it's technically out of spec, I suppose.</p>
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