From srodriguez@kth.se Wed Nov 06 17:47:00 1996
Path: ashpoly!cascade!bigsur!kth!srodriguez
From: srodriguez@kth.se (Steve Rodríguez)
Newsgroups: comp.sys.m68k
Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996Nov06.174700.7784@kth.se>
Date: Wed, 06 Nov 1996 17:47:00 GMT
Organization: Royal Institute of Technology, Stockholm
NNTP-Posting-Host: kth.se
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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.

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

-- 
Steve Rodríguez
Opinions expressed are solely my own and not those of Royal Institute of Technology, Stockholm.
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From dfournier@tum.de Thu Nov 07 17:30:00 1996
Path: ashpoly!cascade!transat!eunet-fr!teletel!tum!dfournier
From: dfournier@tum.de (Dong-hyun Fournier)
Newsgroups: comp.sys.m68k
Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996Nov07.173000.9683@tum.de>
Date: Thu, 07 Nov 1996 17:30:00 GMT
References: <1996Nov06.174700.7784@kth.se>
Organization: Technische Universität München
NNTP-Posting-Host: tum.de
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In article <1996Nov06.174700.7784@kth.se>, srodriguez@kth.se (Steve Rodríguez) writes:
> Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier.

Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet.

-- 
=== Dong-hyun Fournier ===
Dept of Electrical Engineering, Technische Universität München
"There are 14 nodes and only 10 countries. Count again."