From bsuzuki@mindspring.com Mon Jul 15 22:37:30 1996
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!mindspring!bsuzuki
From: bsuzuki@mindspring.com (Bastien Suzuki)
Newsgroups: comp.sys.m68k
Subject: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996Jul15.223730.4798@mindspring.com>
Date: Mon, 15 Jul 1996 22:37:30 GMT
Organization: MindSpring Enterprises
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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!

-- 
Bastien Suzuki | bsuzuki@mindspring.com
PGP Key fingerprint: 56CE 80B7 0B1F 9FF2
"Keep the channels open."

From dokonkwo@inria.fr Wed Jul 17 00:05:30 1996
Path: ashpoly!cascade!transat!eunet-de!hansebox!inria!dokonkwo
From: dokonkwo@inria.fr (Dong-hyun Okonkwo)
Newsgroups: comp.sys.m68k
Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996Jul17.000530.8879@inria.fr>
Date: Wed, 17 Jul 1996 00:05:30 GMT
References: <1996Jul15.223730.4798@mindspring.com>
Organization: INRIA Rocquencourt
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In article <1996Jul15.223730.4798@mindspring.com>, bsuzuki@mindspring.com (Bastien Suzuki) 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!

-- 
Dong-hyun Okonkwo | dokonkwo@inria.fr
PGP Key fingerprint: 82D5 C154 756E C8DD
"Keep the channels open."