From mgirard@purdue.edu Sat Jul 08 09:40:48 1995
Path: ashpoly!bigsur!pacrim!jpgate!kamome!purdue!mgirard
From: mgirard@purdue.edu (Mei Girard)
Newsgroups: comp.sys.m68k
Subject: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Jul08.094048.1736@purdue.edu>
Date: Sat, 08 Jul 1995 09:40:48 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!

Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week.

-- 
Mei Girard
Tape trading list upon request. SASE required for international mail.

From dpetrov@pacbell.net Mon Jul 10 12:22:48 1995
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!pacbell!dpetrov
From: dpetrov@pacbell.net (Dong-hyun Petrov)
Newsgroups: comp.sys.m68k
Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Jul10.122248.7291@pacbell.net>
Date: Mon, 10 Jul 1995 12:22:48 GMT
References: <1995Jul08.094048.1736@purdue.edu>
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In article <1995Jul08.094048.1736@purdue.edu>, mgirard@purdue.edu (Mei Girard) 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.

PGP Public key available via finger or upon request.

-- 
=== Dong-hyun Petrov ===
Dept of Electrical Engineering, Pacific Bell Internet Services
"They will send a copy in my place."