On Do, 2006-12-21 at 18:53 +0200, Sergei Steshenko wrote:> On Thu, 21 Dec 2006 17:44:55 +0100> Sebastian Schäfer <schaefer@xxxxxxx> 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 boostthe bass, suppress the mids and highs, or do nothing at all, just firethe sound through the EQ.
BTW: Suppressing is not very funny with that sound chip, because it'squite weak to begin with... :-(
Sebastian
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