From shughes@earthlink.net Thu Aug 22 22:17:37 1996
Path: ashpoly!cascade!transat!ukc!fennimore!earthlink!shughes
From: shughes@earthlink.net (Steve Hughes)
Newsgroups: comp.sys.m68k
Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996Aug22.221737.3746@earthlink.net>
Date: Thu, 22 Aug 1996 22:17:37 GMT
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Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler.

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.

Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames!

-- 
Steve Hughes
Opinions expressed are solely my own and not those of EarthLink Network.
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From mbrennan@mit.edu Sun Aug 25 01:40:37 1996
Path: ashpoly!bigsur!pacrim!jpgate!kamome!mit!mbrennan
From: mbrennan@mit.edu (Mike Brennan)
Newsgroups: comp.sys.m68k
Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996Aug25.014037.6632@mit.edu>
Date: Sun, 25 Aug 1996 01:40:37 GMT
References: <1996Aug22.221737.3746@earthlink.net>
Organization: Massachusetts Institute of Technology
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In article <1996Aug22.221737.3746@earthlink.net>, shughes@earthlink.net (Steve Hughes) writes:
> Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler.

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

-- 
Mike Brennan
Tape trading list upon request. SASE required for international mail.