Subject: Re: [linux-audio-user] noisy capture->playback
From: David (dplist_AT_free.fr)
Date: Sun Nov 02 2003 - 21:10:08 EET
On Sun, 2 Nov 2003 13:18:12 -0500
Joe Hartley <jh_AT_brainiac.com> wrote:
> On Sun, 2 Nov 2003 19:07:39 +0100
> David <dplist_AT_free.fr> wrote:
>
> > On 02 Nov 2003 09:48:44 -0600
> > Jan Depner <eviltwin69_AT_cableone.net> wrote:
> >
> > > I'm not sure I'm following this. How have you got envy24control
> > > set up?
> >
> > Bad noise comes when I set H/W Out 1/2 to PCM Out 1/2 and connect
> > using jackd the alsa capture port (that map to a H/W In) to the alsa
> > playback port 1/2 (that maps to PCM Out 1/2).
>
> David, how exactly dows this mapping take place? Via a command line?
> A jack patchbay? Routing in a particular program? or with the
> envy24control GUI? Detailing the steps you take to set this up may
> prove helpful.
By default, jackd maps its "alsa_pcm:capture_1" port to the "H/W In 1"
input of the soundcard and its "alsa_pcm:playback_1" port to
the "PCM Out 1" of the soundcard.
I connected these two jack ports using qjackconnect, I guess I could do
the same with jack_connect.
With envy24control's "Patchbay/Router", I chose "PCM Out 1" to be
heard on "H/W Out1" so that I can hear what jackd is spitting in
"alsa_pcm:playback_1".
I this a little bit clearer ? Sorry for being confusing.
> I recall having this happen when I had the Omni (long since upgraded
> to a Delta 1010). I think there was some sort of monitoring or source
> button I had to push on the Onmi box to stop this. The noise, if it's
> what I'm thinking of, is the digital equivalent of a feedback loop.
On the Omni itself ? I don't think I have such a button.
> --
> ======================================================================
> Joe Hartley - UNIX/network Consultant - jh_AT_brainiac.com
> Without deviation from the norm, "progress" is not possible. - FZappa
Thanks.
-- David
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