Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[AndyU]

I discovered long after I ripped my cds that some of them might have been issued with the pre-emphasis flag set, and so need de-emphasis on playback for the correct balance. This seems to have been an issue with some early jazz and classical cds, and would explain how a few of my rips sound horridly bright in a way I don't recall the cds sounding. I've had a dig about the forum without any clear result - what I'm really after is a de-emphasis DSP option to apply the correct equalisation. Or a plug-in or some-such. foobar (cough,cough) recognises the PRE_EMPHASIS tag and corrects; iTunes (believe it or not) applies de-emphasis on ripping. But I'm dyed-in-the-wool Media Center user .. anyone got any ideas?

[6233638]

You can apply de-demphasis processing to albums using SoX.
http://sourceforge.net/projects/sox/files/sox/14.4.1/sox-14.4.1a-win32.zip/download
 
To make this process easier, edit the "batch-example.bat" or create a new batch file using:

Code: (Batch File) [Select]

cd %~dp0
mkdir converted
FOR %%A IN (%*) DO sox %%A -b24 "converted/%%~nxA" deemph
pause
Then you can just drop tracks onto the batch file one at a time, and they will automatically be converted to a 24-bit file with de-emphasis applied, and placed in the "Converted" folder.
 
 
Unfortunately neither Media Center nor dBpoweramp (the tools I use) report whether a disc is using pre-emphasis or not, but it is generally very rare and only applies to older CDs.
 
Here is a list of discs known to use pre-emphasis, though I don't know how comprehensive it is:
http://www.studio-nibble.com/cd/index.php?title=Pre-emphasis_(release_list)
 
As far as I am aware, only two discs in my library use it - one of which is not on the list.

[gappie]

Here is a list of discs known to use pre-emphasis, though I don't know how comprehensive it is:
http://www.studio-nibble.com/cd/index.php?title=Pre-emphasis_(release_list)
 
As far as I am aware, only two discs in my library use it - one of which is not on the list.

hmppfff i have this little alarm bell going.  and i did some panic reading, but i do not understand. so there are apparently cd's that have a pre_emphasis flag (  ? ) and it is set in the tags (where, on the cd, or the ripping program, but then, where did they got the info from). i have a bunch from what is on that list.. do i have to search in my attic for them to see if it are indeed the same cd's and do something with them and wash my ears.. i ripped all with mc.. 

 
gab

[6233638]

Generally it's only discs produced in the 80s that use it, and they're usually quite grating to listen to without the de-emphasis.
 
It's not something to be too concerned about.

[AndyU]

You can apply de-demphasis processing to albums using SoX.
http://sourceforge.net/projects/sox/files/sox/14.4.1/sox-14.4.1a-win32.zip/download
 
To make this process easier, edit the "batch-example.bat" or create a new batch file using:

Code: (Batch File) [Select]

cd %~dp0
mkdir converted
FOR %%A IN (%*) DO sox %%A -b24 "converted/%%~nxA" deemph
pause
Then you can just drop tracks onto the batch file one at a time, and they will automatically be converted to a 24-bit file with de-emphasis applied, and placed in the "Converted" folder.
 
 
Unfortunately neither Media Center nor dBpoweramp (the tools I use) report whether a disc is using pre-emphasis or not, but it is generally very rare and only applies to older CDs.
 
Here is a list of discs known to use pre-emphasis, though I don't know how comprehensive it is:
http://www.studio-nibble.com/cd/index.php?title=Pre-emphasis_(release_list)
 
As far as I am aware, only two discs in my library use it - one of which is not on the list.

Thanks for the sox magic. Will probably have to go that way. But notice that since version 14.2 dBpoweramp DOES show whether a disc is using pre-emphasis or not. It will show it in the "Track Technical" column of the main view, but this is not displayed by default. So, if you set the PRE_EMPHASIS tag appropriately, and use a player like foobar that applies de-emphasis all is well with playback. I agree that this might not affect many cds, but I suspect I have a good handful of classical rips and a few  Jazz that are affected and I'd prefer to play them back right!

[gappie]

Generally it's only discs produced in the 80s that use it, and they're usually quite grating to listen to without the de-emphasis.
 
It's not something to be too concerned about.

ok.. cool.. my wife always says, that when she met me 27 years ago i was cool because i had 10 cd's and a broken cd player (and a lot of vinyl  )...

thanks... i can live with that

 
gab

[6233638]

But notice that since version 14.2 dBpoweramp DOES show whether a disc is using pre-emphasis or not. It will show it in the "Track Technical" column of the main view, but this is not displayed by default. So, if you set the PRE_EMPHASIS tag appropriately, and use a player like foobar that applies de-emphasis all is well with playback.

Good to know - I must have missed that change.