Re: [linrad] audio channels

["Arie Dogterom" <pa0ez@xxxxxxxxxxxxx]

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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