From rsuzuki@stanford.edu Thu Feb 23 20:41:37 1995
Path: ashpoly!cascade!transat!ukc!fennimore!stanford!rsuzuki
From: rsuzuki@stanford.edu (Rodrigo Suzuki)
Newsgroups: comp.sys.m68k
Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Feb23.204137.9857@stanford.edu>
Date: Thu, 23 Feb 1995 20:41:37 GMT
Organization: Stanford University Computer Systems Lab
NNTP-Posting-Host: stanford.edu
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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!

-- 
Rodrigo Suzuki
Tape trading list upon request. SASE required for international mail.

From jfischer@hanse.de Sat Feb 25 19:15:37 1995
Path: ashpoly!bigsur!pacrim!jpgate!kamome!hanse!jfischer
From: jfischer@hanse.de (Julien Fischer)
Newsgroups: comp.sys.m68k
Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Feb25.191537.1143@hanse.de>
Date: Sat, 25 Feb 1995 19:15:37 GMT
References: <1995Feb23.204137.9857@stanford.edu>
Organization: Hanse-Netzwerk Hamburg
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In article <1995Feb23.204137.9857@stanford.edu>, rsuzuki@stanford.edu (Rodrigo Suzuki) writes:
> 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.

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

My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise!

-- 
Julien Fischer
Opinions expressed are solely my own and not those of Hanse-Netzwerk Hamburg.
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From elarsson@purdue.edu Mon Feb 27 20:25:37 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!purdue!elarsson
From: elarsson@purdue.edu (Élodie Larsson)
Newsgroups: comp.sys.m68k
Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Feb27.202537.4459@purdue.edu>
Date: Mon, 27 Feb 1995 20:25:37 GMT
References: <1995Feb23.204137.9857@stanford.edu> <1995Feb25.191537.1143@hanse.de>
Organization: Purdue University Engineering Computer Network
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In article <1995Feb25.191537.1143@hanse.de>, jfischer@hanse.de (Julien Fischer) writes:
> Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window.

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

-- 
=== Élodie Larsson ===
Dept of Electrical Engineering, Purdue University Engineering Computer Network
"Tape doesn't lie at 02:14. Ears do."

From msouza@uni-hamburg.de Wed Mar 01 01:31:37 1995
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!uni-hamburg!msouza
From: msouza@uni-hamburg.de (Marisol Souza)
Newsgroups: comp.sys.m68k
Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Mar01.013137.4478@uni-hamburg.de>
Date: Wed, 01 Mar 1995 01:31:37 GMT
References: <1995Feb23.204137.9857@stanford.edu> <1995Feb25.191537.1143@hanse.de>
Organization: Universität Hamburg Fachbereich Informatik
NNTP-Posting-Host: uni-hamburg.de
X-Newsreader: Netscape 1.1N
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In article <1995Feb25.191537.1143@hanse.de>, jfischer@hanse.de (Julien Fischer) writes:
> Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window.
> My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise!

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

-- 
Marisol Souza
Opinions expressed are solely my own and not those of Universität Hamburg Fachbereich Informatik.
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