[Gllug] multiple mic-in [VERY OT]

[Jonathan Dye]

> -----Original Message-----
> From: Dylan Brewis [mailto:dylan at exoletus.fsnet.co.uk]
> Sent: 12 May 2002 03:19
> To: gllug at linux.co.uk
> Subject: Re: [Gllug] multiple mic-in [VERY OT]
> 
> 
> On Saturday 11 May 2002 23:52, Richard Cottrill wrote:
> > Possibly a really silly question: Is it possible to use more than one
> > sound card in a machine? I've never tried; in fact I've never gotten
> > sound to work under Linux at all (but I haven't really had many
> > opportunities to try either).
> 
> Should think so, wouldn't u end up with /dev/snd0 /dev/snd1 ...?  I had 2
> running under Windoze once (ONCE, mind u!)

It is possible to run several soundcards at once and you end up with
/dev/dsp0 /dev/dsp1 etc. (althought, of course you can name them what you
like as long as you get the device numbers correct).  The problems arrise
when you have drivers that only support one card at a time or cards that
don't like each other.  I've definatly done it but can't remember which
cards I used except that they were not the same.

> > It may also be relevant that some cards (older only?) have/had separate
> > line-in and microphone ports. From my spectacularly limited
> > understanding of sound equipment, the difference is a pre-amp or
> > something.  Whatever the difference is I'm pretty sure I've gotten them
> > mixed up and lived to tell the tale.
> 
> Well, microphones and record players output at milivolt levels, and line
> level is a couple of orders of magnitude above that. There are deeply
> technical signal differences as well, but they're probably not too
> relevant for sound cards (given the presence of fans and transformers) -
> anyone who was concerned about that stuff would have an external
> preprocessor.
> 

JD

> > Richard
> > 
> > > -----Original Message-----
> > > From: gllug-admin at linux.co.uk [mailto:gllug-admin at linux.co.uk]On
Behalf
> > > Of Dylan Brewis
> > > Sent: Sunday, May 12, 2002 2:28 AM
> > > To: gllug at linux.co.uk
> > > Subject: Re: [Gllug] multiple mic-in [VERY OT]
> > >
> > >
> > > What exactly u trying to do?
> > > do u need to discriminate the inputs?
> > > can u mix them before the computer interface?
> > >
> > > On Saturday 11 May 2002 23:25, Daniel Andersson wrote:
> > > > hi
> > > >
> > > > this is probably quite ot.
> > > >
> > > > i'm looking at building some home automation stuff and currently
> > > > i'm looking into doing some voice recognition.  i can buy some
> > > > hardware for £300 + £120 per mic, but that price doesn't really
> > > > attract me.  so i'm looking at going DIY.
> > > >
> > > > what i feel that i need is a sound card with 5 or more mic-in's or
> > > > a special mic-in card that works under linux.
> > > >
> > > > does anyone know of one or know where to search for one? tried
> > > > google, but no luck so far.
> > > >
> > > > thanks in advance
> > > >
> > > > / d

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