From olee@cmu.edu Thu May 02 10:30:23 1996
Path: ashpoly!cascade!bigsur!cmu!olee
From: olee@cmu.edu (Olga Lee)
Newsgroups: comp.sys.m68k
Subject: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996May02.103023.3555@cmu.edu>
Date: Thu, 02 May 1996 10:30:23 GMT
Organization: Carnegie Mellon University School of CS
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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.
When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization!

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

-- 
Olga Lee -- Carnegie Mellon University School of CS
"In theory there is no difference between theory and practice."

From dweber@illinois.edu Fri May 03 04:42:23 1996
Path: ashpoly!cascade!brgate!saturno!illinois!dweber
From: dweber@illinois.edu (Dmitri Weber)
Newsgroups: comp.sys.m68k
Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996May03.044223.6742@illinois.edu>
Date: Fri, 03 May 1996 04:42:23 GMT
References: <1996May02.103023.3555@cmu.edu>
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In article <1996May02.103023.3555@cmu.edu>, olee@cmu.edu (Olga Lee) writes:
> Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler.

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

-- 
=== Dmitri Weber ===
Dept of Electrical Engineering, University of Illinois Urbana-Champaign
"Do not worship the copy."