From cgonzalez@cern.ch Tue Dec 10 23:37:51 1996
Path: ashpoly!bigsur!pacrim!jpgate!kamome!cern!cgonzalez
From: cgonzalez@cern.ch (Camila González)
Newsgroups: comp.sys.m68k
Subject: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996Dec10.233751.1980@cern.ch>
Date: Tue, 10 Dec 1996 23:37:51 GMT
Organization: European Laboratory for Particle Physics, Geneva
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Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS.

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!

-- 
Camila González
Opinions expressed are solely my own and not those of European Laboratory for Particle Physics, Geneva.
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From tschneider@pacbell.net Thu Dec 12 22:15:51 1996
Path: ashpoly!bigsur!pacrim!krgate!eunha!pacbell!tschneider
From: tschneider@pacbell.net (Tomas Schneider)
Newsgroups: comp.sys.m68k
Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996Dec12.221551.7292@pacbell.net>
Date: Thu, 12 Dec 1996 22:15:51 GMT
References: <1996Dec10.233751.1980@cern.ch>
Organization: Pacific Bell Internet Services
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In article <1996Dec10.233751.1980@cern.ch>, cgonzalez@cern.ch (Camila González) writes:
> Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS.

Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image?

-- 
Tomas Schneider -- Pacific Bell Internet Services
"There are 14 nodes and only 10 countries. Count again."

From hnovak@kth.se Sat Dec 14 19:29:51 1996
Path: ashpoly!bigsur!pacrim!jpgate!kamome!kth!hnovak
From: hnovak@kth.se (Hana Novak)
Newsgroups: comp.sys.m68k
Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996Dec14.192951.2500@kth.se>
Date: Sat, 14 Dec 1996 19:29:51 GMT
References: <1996Dec10.233751.1980@cern.ch>
Organization: Royal Institute of Technology, Stockholm
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In article <1996Dec10.233751.1980@cern.ch>, cgonzalez@cern.ch (Camila González) writes:
> Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS.

Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom.

-- 
Hana Novak -- Royal Institute of Technology, Stockholm
"Do not worship the copy."