From jrodriguez@tum.de Wed Nov 08 22:16:26 1995
Path: ashpoly!cascade!mxgate!coyoacan!tum!jrodriguez
From: jrodriguez@tum.de (Jens Rodríguez)
Newsgroups: comp.sys.m68k
Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Nov08.221626.1514@tum.de>
Date: Wed, 08 Nov 1995 22:16:26 GMT
Organization: Technische Universität München
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Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler.

When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization!
I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz.

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

-- 
Jens Rodríguez
Opinions expressed are solely my own and not those of Technische Universität München.
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From dmartinez@hanse.de Thu Nov 09 18:09:26 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!hanse!dmartinez
From: dmartinez@hanse.de (Dmitri Martínez)
Newsgroups: comp.sys.m68k
Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Nov09.180926.3685@hanse.de>
Date: Thu, 09 Nov 1995 18:09:26 GMT
References: <1995Nov08.221626.1514@tum.de>
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In article <1995Nov08.221626.1514@tum.de>, jrodriguez@tum.de (Jens Rodríguez) writes:
> Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler.
> When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization!

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

-- 
Dmitri Martínez
Tape trading list upon request. SASE required for international mail.