In article , Eiron
wrote:
On 23/11/2014 10:40, Jim Lesurf wrote:
In article , Eiron
wrote:
Possibly a dumb question but do any CDs use pre-emphasis? Possibly
some early ones? And do modern CD/DVD players have the corresponding
de-emphasis facility? I have an old test CD with pre-emphasis on some
tracks. Perhaps I should do some measurements with it.

Yes, some discs do flag this. However in some cases this may be due to
the disc producers setting the flag in error.

Harder to tell which players do or don't take it into account. But I
suspect most 'ripping' programs don't.

What test CD?

Denon Audio Technical CD 38C39-7147. GoldWave doesn't de-emphasise when
ripping tracks. I haven't found any other software that will show the
flag.

cdparanoia does report on the demephasis flag (by track) but I'm not
certain how reliable it may be in what it says as I haven't been able to
check what it does. However it does *not* apply de-emphasis. Just rips
the values from the CD 'as is'. So you need to then use something like
sox to generate a file with de-emphasis applied. If you do, you may
want to output 24 bit for the result if you're not happy with the
dithering in sox.

Jim

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