[hpsdr] Dumb question - HPSDR sound card

[Terry Fox]

I might be interested in taking on this project, but it sounds like someone
else (Cecil, KD5NWA) is almost there already.  I'll keep my options open at
this time..... and hope that Cecil fits the need.
Terry


----- Original Message ----- 
From: "Philip Covington" <p.covington at gmail.com>
To: "Terry Fox" <tfox at knology.net>
Cc: "High Performance Software Defined Radio Discussion List"
<hpsdr at hpsdr.org>
Sent: Wednesday, April 04, 2007 12:58 PM
Subject: Re: [hpsdr] Dumb question - HPSDR sound card


> On 4/4/07, Terry Fox <tfox at knology.net> wrote:
> > ***** High Performance Software Defined Radio Discussion List *****
> >
> > This may sound like a divergent path, but...
> >
> > There is a consistent problem with sound cards used with SoftRocks and
other
> > simple SDR hardware.  Especially laptops.  I realize the work here on
Janus
> > & Ozy will create a high-quality converter (I have one set on order),
but
> > there may be room for a simpler project as well.
> >
> > How difficult would it be to take the A/D & D/A and interface them to an
> > FPGA or other USB/firewire interface, all on a single, low-cost board?
For
> > those not interested in spending over $350 for Atlas, Janus, Ozy (or
> > expensive commercial USB/firewire solutions), this one-board solution
would
> > be attractive.  I think it would need to cost less than $100.
> >
> > This is an ongoing issue that will not go away for a while.  I realize
it
> > may "undercut" the Janus/Ozy/Atlas somewhat.  I also realize that there
are
> > many, many sound cards out there, but all are less than optimum or
> > expensive, again especially for laptop use.
> >
> > The cheap PCM2900 boards got me thinking about this potential project.
> > Interfacing a better A/D and D/A to USB in such a way that Windows and
Linux
> > will find them is all that is required.
> >
> > Horton comes the closest to this, but it has the QSD and no D/A, I
believe.
> >
> > Spending $400 for a firewire audio card to use a $13 SoftRock Lite with
a
> > laptop doesn't make sense.  Spending $75 to $100 might.  I believe that
a
> > project like this would do a lot to simplify and therefore further SDR
> > acceptance in the amateur community.
> >
> > Just a thought.
> > Terry
>
> You probably could do something like this (for the target price) with
> the TI TLV320AIC23B CODEC:
>
> <http://focus.ti.com/docs/prod/folders/print/tlv320aic23b.html>
>
> and an Altera EPM240 CPLD + Cypress CY7C68013A "FX2" USB microcontroller.
>
> The TI CODEC is 24 bits/96 kHz and around 90 dB SNR.  The nice thing
> about this CODEC  is that it does not need much analog supporting
> circuitry.
>
> Would you like to take a project like this on as a project leader?
>
> 73 Phil N8VB
>


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