Sorry, I am not much in this stuff... But I am reading now that AGC is
"Automatic gain control"
and it seems what I would like to do.
I am trying to have a more or less constant volume of the speaker
output. The configuration
I posted in the first email works in this sense for stereo; it does
not work for 5.1 audio.
On Sun, Oct 13, 2013 at 11:03 PM, Robert M. Riches Jr.
<rm.ric...@jacob21819.net> wrote:
> I probably don't know any answers, but would like to make sure I
> at least understand the question. Are you trying do AGC on a
> pair-wise basis? Or, is it something else you're trying to do?
>
> Thanks,
>
> Robert Riches
>
>
>> Date: Sun, 13 Oct 2013 15:02:42 +0200
>> From: Paolo Bolzoni <paolo.bolzoni.br...@gmail.com>
>> To: Uwe <upu...@googlemail.com>
>> Cc: alsa-user@lists.sourceforge.net
>>
>> I guess I can split the six channels in three limiters using the multi
>> plugin, but how I can join them back?
>> In the ladspa are other limiters, but they do not have the "gain"
>> control so they do not actually increase the
>> volume. Just adding plain 20db of amplification distorts the sound...
>> Maybe there is an "limited amplifier"
>> or something?
>>
>> I am trying to set-up a chain of plugins to always get the max volume...
>>
>>
>> On Sun, Oct 13, 2013 at 12:58 AM, Uwe <upu...@googlemail.com> wrote:
>> > the problem with the configuration, I think, is: the plugins can handle a
>> > maximum of 2 channels.
>> >
>> > unfortunately, I cannot tell you exactly how, but it *should* be possible
>> > to
>> > route 3 pairs of channels to separate instances of the plugins.
>> >
>> > such a setup might also make sense musically. it might be a good idea to
>> > setup separate plugins for "center" and "bass" because the signal in the
>> > channels differs significantly from the left/right channels in frequency
>> > range and level.
>> >
>> > have fun, Uwe
>> >
>> >
>> > 2013/10/12 Paolo Bolzoni <paolo.bolzoni.br...@gmail.com>
>> >>
>> >> Dear list,
>> >> This is my .asoundrc, and the pair compressor + limiter works fine for
>> >> stereo input:
>> >>
>> >> ----------- >8
>> >> pcm.ladcomp_compressor {
>> >> type ladspa
>> >> slave.pcm "ladcomp_limiter";
>> >> path "/usr/lib/ladspa";
>> >> plugins [{
>> >> label dysonCompress
>> >> input {
>> >> #peak limit, release time, fast ratio, ratio
>> >> controls [0 1 0.5 0.99] }
>> >> }]
>> >> }
>> >>
>> >> pcm.ladcomp_limiter {
>> >> type ladspa
>> >> slave.pcm "plughw:Audigy2";
>> >> path "/usr/lib/ladspa";
>> >> plugins [{
>> >> label fastLookaheadLimiter
>> >> input {
>> >> #InputGain(Db) -20 -> +20 ; Limit (db) -20 -> 0 ; Release
>> >> time (s) 0.01 -> 2
>> >> controls [ 20 -1 0.8 ] }
>> >> }]
>> >> }
>> >> 8< -----------
>> >>
>> >> Unfortunately, it does not work for 6 channels.
>> >>
>> >> I.e., this one works fine (I setup my system to use a certain PCM
>> >> via environment variable):
>> >> $ ALSAPCM='pcm.ladcomp_compressor' speaker-test -c 2 -t wav -l 5
>> >>
>> >> This one does not and you hear only the left and right channels.
>> >> $ ALSAPCM='pcm.ladcomp_compressor' speaker-test -c 6 -t wav -l 5
>> >>
>> >> Of course the hardware is wired correctly and this one works as expected:
>> >> $ ALSAPCM='pcm.surround51' speaker-test -c 6 -t wav -l 5
>> >>
>> >>
>> >> Since normally you have to select surround51 manually I thought that the
>> >> problem could be in the output pcm, and I rewrote like this. But it is the
>> >> same:
>> >>
>> >> ----------- >8
>> >> #[...] analogous 51 compressor omitted
>> >>
>> >> pcm.plug51 {
>> >> type plug
>> >> slave.pcm "surround51"
>> >> slave.channels 6
>> >> }
>> >>
>> >> pcm.ladcomp_limiter51 {
>> >> type ladspa
>> >> slave.pcm "plug51"
>> >> path "/usr/lib/ladspa"
>> >> plugins [{
>> >> label fastLookaheadLimiter
>> >> input {
>> >> #InputGain(Db) -20 -> +20 ; Limit (db) -20 -> 0 ; Release
>> >> time (s) 0.01 -> 2
>> >> controls [ 20 -1 0.8 ] }
>> >> }]
>> >> }
>> >> 8< -----------
>> >>
>> >> Is there a way? Any insight?
>> >>
>> >> Yours faithfully,
>> >> Paolo
>> >>
>> >>
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