State of the art
ajp166 at bellatlantic.net
Fri Sep 23 11:29:04 CDT 2005
>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
>>>>>> "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.
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.
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