[icecast] automatic gain control

William Goldsmith wildbill at kpig.com
Wed Nov 14 09:06:32 PST 2001



Sounds like you need to fix the problem at the source first: balancing the
levels going *into* your mixing board so that they're not all over the place
coming out. You'll never fix that with any hardware or software device.

I use a program called ecasound to do software dynamics processing, but
you'd have to hack liveice pretty extensively to use it in that situation.
Software dynamics processing is pretty complex (& processor-intensive).  The
mini-disc recorder you speak of almost certainly uses a dedicated DSP chip
(or even analog AGC).

-bg
www.radioparadise.com
www.kpig.com

> the ACG function that the compressor provides is limited at best. its
> adjustment is way too audible to make full use of it in balancing levels.
> yes, it is last in the chain. i'm just wondering if there's anything out
> there in the way of software. if a minidisc recorder can do it, why can't
a
> $1000 pc?
>
> -p
>
> > From: "William Goldsmith" <wildbill at kpig.com>
> > Reply-To: icecast at xiph.org
> > Date: Wed, 14 Nov 2001 08:36:36 -0800
> > To: <icecast at xiph.org>
> > Subject: Re: [icecast] automatic gain control
> >
> > From what you describe, your comp/limiter can't possibly be working
> > correctly. It should be the last unit in line before the sound card, and
> > needs to be adjusted properly. You also need to balance the levels on
your
> > mixing board (so that the correc t level comes at predictable place on
the
> > slider). It might be worthwhile to find someone with some sound-mixing
or
> > radio engineering experience to help you out. Sounds like you're missing
> > some very basic stuff.
> >
> > Software dynamics processing is more involved than you might think. And
> > you'd be trying to use software to solve what is basically a
hardware/user
> > problem.
> >
> > Furman also makes total crap. You'd be much better off with one of the
newer
> > Behringer units. Cheap but very functional. Though that doesn't negate
the
> > need to take care of the basics mentioned above.
> >
> > -bg
> > www.radioparadise.com
> > www.kpig.com
> >
> >
> >
> >> we're actually using a furman c/l already, but the levels coming into
the
> >> mixer are still all over the place. one mp3 might be much louder than
> >> another, the phone interface is way too loud, the dj mic is too quiet,
> > etc.
> >> usually one of the planners ends up sitting by and adjusting the igain
in
> >> aumix. is there any software-based solution? it seems like it wouldn't
be
> >> all that hard to implement.
> >>
> >> -p
> >>
> >>> From: Reuben Martin <Reuben at FishB8.dns2go.com>
> >>> Reply-To: icecast at xiph.org
> >>> Date: Wed, 14 Nov 2001 09:41:14 -0600
> >>> To: icecast at xiph.org
> >>> Cc: pharkawik at hampshire.edu
> >>> Subject: Re: [icecast] automatic gain control
> >>>
> >>>> we have a web-based station running liveice and aumix and the levels
> > are all
> >>>> over the place. is there a way to do automatic gain control on the
> > soundcard
> >>>> input?
> >>>>
> >>>> -peter
> >>>
> >>>
> >>> Run the signal through a Compressor/Limiter before sending it to your
> >>> soundcard. I use Behringer Ultra-Dyne Pro DSP9024. Very nice. If you
> >>> want to buy it look here:
> >>> http://www.zzounds.com/love.music?p=p.BEHDSP9024&z=1221177312792
> >>>
> >>>
> >>> -Reuben
> >>>
> >>>
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