From nlaurent@rwth-aachen.de Thu Apr 04 02:21:11 1996
Path: ashpoly!cascade!brgate!saturno!rwth-aachen!nlaurent
From: nlaurent@rwth-aachen.de (Nadine Laurent)
Newsgroups: comp.sys.m68k
Subject: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996Apr04.022111.8378@rwth-aachen.de>
Date: Thu, 04 Apr 1996 02:21:11 GMT
Organization: RWTH Aachen Informatik
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Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier.

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.

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

-- 
Nadine Laurent
Opinions expressed are solely my own and not those of RWTH Aachen Informatik.
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From dreyes@stanford.edu Thu Apr 04 10:59:11 1996
Path: ashpoly!cascade!brgate!saturno!stanford!dreyes
From: dreyes@stanford.edu (Diego Reyes)
Newsgroups: comp.sys.m68k
Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996Apr04.105911.1729@stanford.edu>
Date: Thu, 04 Apr 1996 10:59:11 GMT
References: <1996Apr04.022111.8378@rwth-aachen.de>
Organization: Stanford University Computer Systems Lab
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In article <1996Apr04.022111.8378@rwth-aachen.de>, nlaurent@rwth-aachen.de (Nadine Laurent) writes:
> Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier.

Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos!

-- 
Diego Reyes
Tape trading list upon request. SASE required for international mail.

From jperez@delphi.com Thu Apr 04 20:34:11 1996
Path: ashpoly!bigsur!pacrim!jpgate!kamome!delphi!jperez
From: jperez@delphi.com (Joachim Pérez)
Newsgroups: comp.sys.m68k
Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996Apr04.203411.5978@delphi.com>
Date: Thu, 04 Apr 1996 20:34:11 GMT
References: <1996Apr04.022111.8378@rwth-aachen.de> <1996Apr04.105911.1729@stanford.edu>
Organization: Delphi Internet Services
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In article <1996Apr04.105911.1729@stanford.edu>, dreyes@stanford.edu (Diego Reyes) writes:
> Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos!

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

Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs.

-- 
Joachim Pérez
Opinions expressed are solely my own and not those of Delphi Internet Services.
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