Re: (full-duplex) Re: KDE media players
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Op woensdag 16 april 2003 12:45, schreef Joao Pedro Clemente:
> > > For example, you can listen to music using Noatun but still hear
> > > system sounds. If your sound card doesn't support multiple parallel
> > > sound inputs (there's probably a more scientific term), you need arts
> > > for this to work.
> >
> > Yes, it's called full duplex actually. All recent sound cards (or not
> > too cheap ones) can do this.
>
> Are you sure about this? I was pretty confident that "full duplex" meant
> being able to send & receive simultaneously... Like speaking to mic and
> listening to onother sound...
In my (non expert) opinion, this has only little do with full-duplex.
full-duplex: communication/transportation can occur in two directions at the
same time, eg a normal telephone or a road
half-duplex: both directions are possible, but only one at a time (eg a
classic walky-talky, that's either in send or in receive mode).
simplex: communication is only possible in one direction.
Each data stream flows through a channel. The amount of channels determines
how many streams you can handle at the same time. For full-duplex sound,
you'll need at least 2 channels, one for playing, and one for recording.
If you want full-duplex sound (eg for voicechat) and play mp3's in the
background, you'll need at least 3 channels. 1 for sending, 1 for receiving,
and 1 for the music.
If you do not have enough hardware channels, it is possible to merge the
channels in software. This is one of the tasks of alsa/esd/jack/etc...
- --
Casper Gielen
CAPSLOCK2000@zvdk.nl, casper@dse.nl
- --
Wiggle your mouse. Its just a screensaver.
_Sprocket_ on Slashdot
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