From slaurent@tum.de Thu Jan 19 04:40:21 1995
Path: ashpoly!bigsur!pacrim!krgate!eunha!tum!slaurent
From: slaurent@tum.de (Sven Laurent)
Newsgroups: comp.sys.m68k
Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Jan19.044021.5800@tum.de>
Date: Thu, 19 Jan 1995 04:40:21 GMT
Organization: Technische Universität München
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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.

-- 
Sven Laurent <slaurent@tum.de>
US Robotics Courier V.34 @ ISDN 64k bps
"A soul is not exclusive to biology."

From skim@uu.net Fri Jan 20 12:32:21 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!uu!skim
From: skim@uu.net (Steve Kim)
Newsgroups: comp.sys.m68k
Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Jan20.123221.1994@uu.net>
Date: Fri, 20 Jan 1995 12:32:21 GMT
References: <1995Jan19.044021.5800@tum.de>
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In article <1995Jan19.044021.5800@tum.de>, slaurent@tum.de (Sven Laurent) writes:
> Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier.

PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985.

-- 
Steve Kim
Tape trading list upon request. SASE required for international mail.