[LAU] Pre-emphasis detection

[Fons Adriaensen]

On Sat, Apr 13, 2013 at 04:09:01PM +0100, R Kimber wrote:
 
> > A pre-emphasised CD played without de-emphasis will sound unusually
> > bright. The pre-emphasis is roughly the same as a typical 'treble'
> > tone control set to +10 dB, so it should be pretty obvious.
> 
> Sure, but I want to check hundreds of files on a hard disk.  Are you saying
> that there is no tool that I can incorporate in a script to do this from the
> command line? That's what I'm asking.

Such a tool would have to 'know' how something is supposed to 
sound, i.e. what the expected average spectrum should be, and
then decide if a file is too bright or not. Apart from that,
once the CD is converted to a file there is no other way. So
you'll have to listen. 

Anyway rather few CDs will have pre-emphasis, it is mainly
a thing from the early days when many players were limited 
to 14 bits.

Ciao,

-- 
FA

A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris
and hysterically inflated market opportunities. (Cory Doctorow)