[LAU] EQing headerless raw audio

[Mark Knecht]

On Mon, Mar 17, 2008 at 4:46 AM, Simon Williams
<simon at systemparadox.co.uk> wrote:
> Mark Knecht wrote:
>  >    Keeping the audio at maximum values as far as you can through the
>  > audio chain is best for signal-to-noise, etc., and the audio at the
>  > start of your pipe is doing that. EQing is now a subjective step you
>  > are adding, presumably for good reason. To do this you cut the other
>  > EQ bands so as to allow the band you want to be more promenent to come
>  > through. You might just do this with a volume control at the front end
>  > of your EQ unit, or you might adjust each of the unwanted bands. The
>  > two options may have different sonic characteristics. Play with it and
>  > hear for yourself.
>
>  Right. The question now is how do I control the overall volume? Is there
>  anything in the header which says how loud the track is? Not that that
>  will help here- I think my only option is to tell the mplayer at the end
>  of the pipe to turn it up a bit.
>
If the data is 'headerless' (I'm not a programmer so I cannot help you
with that part) then there is no header to tell you anything, is
there?

I think the general path you are looking for is that if you logically
want to raise a single band of EQ by 10db then what you really want to
do physically is cut the level of the other 9 bands by 10db leaving
the one you want at 0db cut. If you want to adjust the level of your
player at the end of the chain to get a final volume that's probably a
good feature to build in but in general I *think* that the final level
in mplayer should be viewed as a way of leveling different audio
sources as different audio files have a small/large degree of
variation in overall volume.

Hope this helps,
Mark