From glaurent@purdue.edu Tue Jun 06 18:16:29 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!purdue!glaurent
From: glaurent@purdue.edu (Göran Laurent)
Newsgroups: comp.sys.m68k
Subject: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Jun06.181629.8433@purdue.edu>
Date: Tue, 06 Jun 1995 18:16:29 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.
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!

-- 
Göran Laurent | glaurent@purdue.edu
PGP Key fingerprint: 02DA 6E59 8EC4 463E
"Keep the channels open."

From mivanov@kth.se Thu Jun 08 00:24:29 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!kth!mivanov
From: mivanov@kth.se (Mike Ivanov)
Newsgroups: comp.sys.m68k
Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Jun08.002429.9613@kth.se>
Date: Thu, 08 Jun 1995 00:24:29 GMT
References: <1995Jun06.181629.8433@purdue.edu>
Organization: Royal Institute of Technology, Stockholm
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In article <1995Jun06.181629.8433@purdue.edu>, glaurent@purdue.edu (Göran Laurent) writes:
> Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS.

Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet.

-- 
Mike Ivanov
Opinions expressed are solely my own and not those of Royal Institute of Technology, Stockholm.
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