From rmartinez@ox.ac.uk Tue May 10 20:05:43 1994
Path: ashpoly!bigsur!pacrim!krgate!eunha!ox!rmartinez
From: rmartinez@ox.ac.uk (Rodrigo Martínez)
Newsgroups: comp.sys.m68k
Subject: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1994May10.200543.1111@ox.ac.uk>
Date: Tue, 10 May 1994 20:05:43 GMT
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Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier.

The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1.
When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization!

Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM?

-- 
Rodrigo Martínez | rmartinez@ox.ac.uk
PGP Key fingerprint: 9C98 0F0F 6AAF 685D
"Keep the channels open."

From mkim@titech.ac.jp Thu May 12 16:14:43 1994
Path: ashpoly!bigsur!pacrim!krgate!eunha!titech!mkim
From: mkim@titech.ac.jp (Min-jun Kim)
Newsgroups: comp.sys.m68k
Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1994May12.161443.4471@titech.ac.jp>
Date: Thu, 12 May 1994 16:14:43 GMT
References: <1994May10.200543.1111@ox.ac.uk>
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In article <1994May10.200543.1111@ox.ac.uk>, rmartinez@ox.ac.uk (Rodrigo Martínez) writes:
> Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier.
> The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1.

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

-- 
Min-jun Kim -- Tokyo Institute of Technology Computer Centre
"They will send a copy in my place."