On Do, 2006-12-21 at 18:53 +0200, Sergei Steshenko wrote:
> On Thu, 21 Dec 2006 17:44:55 +0100
> Sebastian Schäfer <[EMAIL PROTECTED]> wrote:
>
> > Hi!
> >
> > After I finally switched from that CMI3738 card to Intel HD Audio (a
> > SigmaTel chip) I have another quite interesting problem:
> >
> > As the bass of the Intel HDA is a bit weak, I tried applying a LADSPA
> > equalizer filter on it. After I spent most of the day to get that
> > working I now have a problem:
> >
> > When playing a wave file (stereo) with aplay --> equalizer works
> > absolutely fine.
> >
> > When playing a movie with 5.1 sound using mplayer --> sound is
> > crackling, like it can't be played fast enough, or like when you ffwd
> > through a dvd. Something like that.
> >
> > When playing the mentioned wave file with mplayer --> equalizer works
> > fine.
> >
> > Is this ALSA's way to tell me that using that equalizer is not a good
> > idea, or am I doing something wrong?
> >
> > My asound.conf looks like this:
> > ----
> > pcm.ladspa {
> > type ladspa
> > slave.pcm "plughw:0,0";
> > path "/usr/lib/ladspa";
> > channels 6
> > plugins
> > [
> > {
> > label dj_eq
> > id 1901
> > filename "/usr/lib/ladspa/dj_eq_1901.so"
> > input {
> > controls [ 0 0 0 ]
> > }
> > }
> > ]
> > }
> >
> > pcm.!default {
> > type plug
> > slave.pcm "ladspa";
> > }
> >
> > pcm.!surround51 {
> > type plug
> > slave.pcm "ladspa";
> > }
> > ----
> >
> > The same thing happens when I use another plugin out of Steve Hariss'
> > collection (tried with vynil).
> > My worst fear is, that I have done nothing wrong and these plug-ins are
> > simply not capable of coping with multichannel audio. But why are the
> > additional 4 channels not just discarded, but the sound completely
> > distorted?
> >
> > Thanks in advance for any help,
> > Best wishes and a merry christmas to you all!
> > Sebastian Schäfer
> For starters, do not boost bass, rather, suppress all the rest
> - remember, you have limited number of bits to represent sound,
> thus you should never have overflows.
>
> Boosting something directly can cause overflows, boosting through
> suppressing the rest can not (more or less).
>
> --Sergei.
>
Well, unfortunately the result is the same, irrespective whether I boost
the bass, suppress the mids and highs, or do nothing at all, just fire
the sound through the EQ.
BTW: Suppressing is not very funny with that sound chip, because it's
quite weak to begin with... :-(
Sebastian
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