From tsantos@netcom.com Fri Jan 14 13:42:12 1994
Path: ashpoly!cascade!transat!eunet-fr!teletel!netcom!tsantos
From: tsantos@netcom.com (Thiago Santos)
Newsgroups: comp.sys.m68k
Subject: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1994Jan14.134212.2516@netcom.com>
Date: Fri, 14 Jan 1994 13:42:12 GMT
Organization: NETCOM On-Line Communication Services
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Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier.

The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1.
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.

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

-- 
Thiago Santos -- NETCOM On-Line Communication Services
"Hold for relay."

From mvasiliev@uu.net Fri Jan 14 21:52:12 1994
Path: ashpoly!cascade!transat!sunet!nordrelay!uu!mvasiliev
From: mvasiliev@uu.net (Mike Vasiliev)
Newsgroups: comp.sys.m68k
Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1994Jan14.215212.1010@uu.net>
Date: Fri, 14 Jan 1994 21:52:12 GMT
References: <1994Jan14.134212.2516@netcom.com>
Organization: UUNET Technologies, Falls Church VA
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In article <1994Jan14.134212.2516@netcom.com>, tsantos@netcom.com (Thiago Santos) writes:
> Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier.

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 Vasiliev
Opinions expressed are solely my own and not those of UUNET Technologies, Falls Church VA.
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