Re: [linrad] audio channels

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

   Hello Arie.

   That is a whole new chapter, the human brain and the detection
   of cw in noise. Much has been written about it. And I
   am not going there.
   There is that experiment with the AF9Y unknown sound file and
   I am not quite sure what the outcome was in the end. I am quite 
   sure many gave it a listening session.
  
   73 Rein

Arie Dogterom wrote:
> 
> Hallo Rein,
> Yes in principle my laptop sound system is full duplex and stereo in/out.
> The stereo works fine when playing cd's and playing .wav.
> But I cannot test more as - I said that earlier- I only have a single mono
> mic input externally available.
> But your remarkton the CD stimulated my thinking and probably it will not be
> too difficult to find the cd player output wires ( if there is an analog CD
> output - it could also be digitally connected to the card) to get a stereo
> input.
> But it is not too important for me. Linrad was challenging to get it
> running, but for my microwave practice the windows filter programmes are
> easier to run. But nor these nor linrad have yet been able to surpass my
> ears in decoding weak signals.
> 73
> Arie
> 
> ----- Original Message -----
> From: Rein A. Smit <rein0zn@xxxxxxxxxxxxx>
> To: <linrad@xxxxxxxxxxxxxxxxxxxxxx>
> Sent: Thursday, May 22, 2003 12:31 AM
> Subject: Re: [linrad] audio channels
> 
> >
> >    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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