From tsokolov@clari.net Tue Apr 23 21:21:35 1996
Path: ashpoly!cascade!mxgate!coyoacan!clari!tsokolov
From: tsokolov@clari.net (Tyler Sokolov)
Newsgroups: comp.sys.m68k
Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996Apr23.212135.2611@clari.net>
Date: Tue, 23 Apr 1996 21:21:35 GMT
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Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS.

By setting up Paula's audio DMA to double-buffer incoming 8-bit samples, the 68020 has plenty of cycles left for the Costas loop.
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!

-- 
Tyler Sokolov
Tape trading list upon request. SASE required for international mail.

From mokonkwo@cam.ac.uk Wed Apr 24 05:28:35 1996
Path: ashpoly!cascade!transat!sunet!nordrelay!cam!mokonkwo
From: mokonkwo@cam.ac.uk (Morag Okonkwo)
Newsgroups: comp.sys.m68k
Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996Apr24.052835.7780@cam.ac.uk>
Date: Wed, 24 Apr 1996 05:28:35 GMT
References: <1996Apr23.212135.2611@clari.net>
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In article <1996Apr23.212135.2611@clari.net>, tsokolov@clari.net (Tyler Sokolov) writes:
> Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS.

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

If you are posting from AOL, please read RFC 1036 before posting again.

-- 
=== Morag Okonkwo ===
Dept of Electrical Engineering, University of Cambridge Computer Laboratory
"Hold for relay."

From moliveira@rwth-aachen.de Wed Apr 24 14:58:35 1996
Path: ashpoly!cascade!transat!ukc!fennimore!rwth-aachen!moliveira
From: moliveira@rwth-aachen.de (Marisol Oliveira)
Newsgroups: comp.sys.m68k
Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996Apr24.145835.6772@rwth-aachen.de>
Date: Wed, 24 Apr 1996 14:58:35 GMT
References: <1996Apr23.212135.2611@clari.net> <1996Apr24.052835.7780@cam.ac.uk>
Organization: RWTH Aachen Informatik
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In article <1996Apr24.052835.7780@cam.ac.uk>, mokonkwo@cam.ac.uk (Morag Okonkwo) writes:
> PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985.

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

-- 
Marisol Oliveira -- RWTH Aachen Informatik
"Extraordinary claims require extraordinary spectra."