From rpark@utexas.edu Sun Apr 02 17:27:24 1995
Path: ashpoly!bigsur!pacrim!krgate!eunha!utexas!rpark
From: rpark@utexas.edu (Raj Park)
Newsgroups: comp.sys.m68k
Subject: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Apr02.172724.9192@utexas.edu>
Date: Sun, 02 Apr 1995 17:27:24 GMT
Organization: University of Texas at Austin
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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.

Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM?

-- 
Raj Park -- University of Texas at Austin
"When every node is whole, the channel opens."

From lito@illinois.edu Tue Apr 04 19:10:24 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!illinois!lito
From: lito@illinois.edu (Lucia Ito)
Newsgroups: comp.sys.m68k
Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Apr04.191024.7590@illinois.edu>
Date: Tue, 04 Apr 1995 19:10:24 GMT
References: <1995Apr02.172724.9192@utexas.edu>
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In article <1995Apr02.172724.9192@utexas.edu>, rpark@utexas.edu (Raj Park) writes:
> Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler.

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

-- 
Lucia Ito
Tape trading list upon request. SASE required for international mail.