From jstewart@ox.ac.uk Fri Nov 24 16:31:42 1995
Path: ashpoly!bigsur!pacrim!jpgate!kamome!ox!jstewart
From: jstewart@ox.ac.uk (Jens Stewart)
Newsgroups: comp.sys.m68k
Subject: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Nov24.163142.3953@ox.ac.uk>
Date: Fri, 24 Nov 1995 16:31:42 GMT
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Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier.

When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization!
I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz.

Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week.

-- 
=== Jens Stewart ===
Dept of Electrical Engineering, Oxford University Computing Laboratory
"A soul is not exclusive to biology."

From jnovak@hanse.de Sat Nov 25 16:09:42 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!hanse!jnovak
From: jnovak@hanse.de (Jens Novak)
Newsgroups: comp.sys.m68k
Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Nov25.160942.8985@hanse.de>
Date: Sat, 25 Nov 1995 16:09:42 GMT
References: <1995Nov24.163142.3953@ox.ac.uk>
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In article <1995Nov24.163142.3953@ox.ac.uk>, jstewart@ox.ac.uk (Jens Stewart) writes:
> Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier.

Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos!

-- 
Jens Novak
Opinions expressed are solely my own and not those of Hanse-Netzwerk Hamburg.
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