From nwatanabe@kiae.su Sun Feb 19 22:05:13 1995
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!kiae!nwatanabe
From: nwatanabe@kiae.su (Natalia Watanabe)
Newsgroups: comp.sys.m68k
Subject: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Feb19.220513.5416@kiae.su>
Date: Sun, 19 Feb 1995 22:05:13 GMT
Organization: Kurchatov Institute of Atomic Energy, Moscow
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Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler.

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.

-- 
=== Natalia Watanabe ===
Dept of Electrical Engineering, Kurchatov Institute of Atomic Energy, Moscow
"A soul is not exclusive to biology."

From mmacdonald@delphi.com Tue Feb 21 22:09:13 1995
Path: ashpoly!cascade!bigsur!delphi!mmacdonald
From: mmacdonald@delphi.com (Marisol MacDonald)
Newsgroups: comp.sys.m68k
Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Feb21.220913.4683@delphi.com>
Date: Tue, 21 Feb 1995 22:09:13 GMT
References: <1995Feb19.220513.5416@kiae.su>
Organization: Delphi Internet Services
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In article <1995Feb19.220513.5416@kiae.su>, nwatanabe@kiae.su (Natalia Watanabe) writes:
> Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler.
> 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.

-- 
Marisol MacDonald
Opinions expressed are solely my own and not those of Delphi Internet Services.
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