Re: [linrad] audio channels

["Rein A. Smit" <rein0zn@xxxxxxxxxxxxxxxxx]

   Arie,
   
   OK,  you are right on the output part. The stereo card should
   have 2 channels all the way through. It is a requirement for 
   playing stereo .wav files It should work with one card in 
   that case.
   In case of the delta44 though I assume that card should also
   have 4 output channels so to say. having a second card for 
   playing the audio provides freedom in selecting sampling freq's  
  
   In my case with the AC97,  Linrad reports 2 channels.
   Though in reporting it does not report the 2 as the same. 
   Are you able to play stereo on you laptop?
    
   73 Rein

Arie Dogterom wrote:
> 
> Hallo Rein,
> As I now understand the I and Q channels can be handled by the left and
> right channels of the stereo input of one card. I do not see why then a
> second card would be required. The D-A convertor of the card is separate
> from the A-D convertor although they in general use the same clock.
> You only need more cards if you need more than 2 channels.
> I am still wondering why Linrad reports about my card that there are 4
> channels. I, anyhow, cannot acces more than one on my laptop. But the chips
> probably have internally on th MB unused inputs.
> 73
> Arie
> 
> ----- Original Message -----
> From: Rein A. Smit <rein0zn@xxxxxxxxxxxxx>
> To: <linrad@xxxxxxxxxxxxxxxxxxxxxx>
> Sent: Wednesday, May 21, 2003 11:34 PM
> Subject: Re: [linrad] audio channels
> 
> >
> >     Hi Arie,
> >
> >    It depends on whether you have 1 or 2 mixers. With one mixer you
> >    can go with one stereo sound card plus another card for audio output.
> >
> >    With a dual antenna, as for polarity systems, you need 4 audio
> >    inputs and for a number of other good reasons, you might as well
> >    go DELTA 44 sound board with 4 inputs plus another card for audio
> >    output also stereo.
> >
> >    You could however use 2 regular stereo cards for the front end and
> >    an additional stereo card for audio output. The max sample freq of
> > the
> >    audio card and ADC resolution effect the max freq band you can
> >    monitor and dynamic range etc.
> >    I believe either Leif or Roger had that at one time and Linrad is
> >    able to work with these 3 cards.
> >    You like, probably, the front end cards to sample at a much higher
> >    rate then the audio output card.
> >    I believe the DELTA44 card is still up to this point the best
> >    solution -for the cost/performance ratio.
> >    You will have to work through Leif's and Roger's pages to
> >    see the relations between bandwidth and performance of the receiver.
> >    There are 2 QEX ( ARRL ) papers and they are on the net. The papers
> >    cover in great detail the different combinations. ( Not quite sure
> >    whether it needs ARRL membership access ot not ) If you can't
> >    get it, there are ways.
> >    This is at least, the way I understand it.
> >
> >    Regards
> >
> >    Rein
> >
> > Arie Dogterom wrote:
> > >
> > > Hello,
> > > My question probably has been answered in some of the texts, but I a
> still
> > > unsure :
> > >
> > > Having the mixers with the I an Q outputs, where shall those go : Does
> one
> > > need two soundcards or is it possible to use the left and right channels
> of
> > > a stereo card?
> > > 73
> > > Arie
> >


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