23 Sep
2005
23 Sep
'05
4:29 p.m.
Subject: RE: State of the art
From: Paul Koning <pkoning at equallogic.com>
Date: Fri, 23 Sep 2005 10:17:12 -0400
To: cctalk at classiccmp.org
Actually the sound card modes like WJST and PSK31 only need the sound card
to aquire the signal at audio baseband then the CPU does the heavy lifting.
There is also software defined radio, all modes (AM/FM/SSB/CW) where the
CPU after aquiring quadrature baseband does the decode work, the RF portion
of a reciever can be simple to the extreme but provide prformance and
features at the upper end.
Allison
KB1GMX
>>>> "Henk" == Henk Gooijen
<Gooijen> writes:
Henk> ... and then there is a nice DSP on the modern soundcards.
Henk> HAM radio amateurs use the soundcard DSP to decode those chirpy
Henk> signals you can hear on short wave. Even signals burried in
Henk> "noise" produce text on your screen. A good example is MixW,
Henk> but there are several!
Sure, but the sound card DSP tends to be a pretty low powered DSP.
I think the typical signal processing in GigE or disk read channel
applications starts with analog to digital conversion at close to a
gigasample per second, and then doing DSP on the resulting data
stream. Sound card DSPs are designed for data rates in the few dozen
k samples per second.
paul