From mjohansson@mindspring.com Tue Aug 15 02:54:30 1995
Path: ashpoly!cascade!brgate!saturno!mindspring!mjohansson
From: mjohansson@mindspring.com (Mathieu Johansson)
Newsgroups: comp.sys.m68k
Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Aug15.025430.8005@mindspring.com>
Date: Tue, 15 Aug 1995 02:54:30 GMT
Organization: MindSpring Enterprises
NNTP-Posting-Host: mindspring.com
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Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS.

When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization!
The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1.

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

-- 
Mathieu Johansson -- MindSpring Enterprises
"Extraordinary claims require extraordinary spectra."

From adubois@kth.se Tue Aug 15 06:32:30 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!kth!adubois
From: adubois@kth.se (Astrid Dubois)
Newsgroups: comp.sys.m68k
Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Aug15.063230.7253@kth.se>
Date: Tue, 15 Aug 1995 06:32:30 GMT
References: <1995Aug15.025430.8005@mindspring.com>
Organization: Royal Institute of Technology, Stockholm
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In article <1995Aug15.025430.8005@mindspring.com>, mjohansson@mindspring.com (Mathieu Johansson) writes:
> Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS.

Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window.

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

-- 
=== Astrid Dubois ===
Dept of Electrical Engineering, Royal Institute of Technology, Stockholm
"A soul is not exclusive to biology."