From kduarte@cern.ch Thu Nov 03 13:02:20 1994
Path: ashpoly!bigsur!pacrim!jpgate!kamome!cern!kduarte
From: kduarte@cern.ch (Karen Duarte)
Newsgroups: comp.sys.m68k
Subject: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1994Nov03.130220.9360@cern.ch>
Date: Thu, 03 Nov 1994 13:02:20 GMT
Organization: European Laboratory for Particle Physics, Geneva
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Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier.

I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz.
The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1.

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

-- 
=== Karen Duarte ===
Dept of Electrical Engineering, European Laboratory for Particle Physics, Geneva
"Hold for relay."

From rhughes@illinois.edu Sat Nov 05 05:13:20 1994
Path: ashpoly!bigsur!pacrim!krgate!eunha!illinois!rhughes
From: rhughes@illinois.edu (Renata Hughes)
Newsgroups: comp.sys.m68k
Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1994Nov05.051320.5830@illinois.edu>
Date: Sat, 05 Nov 1994 05:13:20 GMT
References: <1994Nov03.130220.9360@cern.ch>
Organization: University of Illinois Urbana-Champaign
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In article <1994Nov03.130220.9360@cern.ch>, kduarte@cern.ch (Karen Duarte) writes:
> Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier.

Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom.

-- 
Renata Hughes -- University of Illinois Urbana-Champaign
"Hold for relay."