From dhughes@pipeline.com Tue Dec 24 23:31:15 1996
Path: ashpoly!cascade!transat!eunet-fr!teletel!pipeline!dhughes
From: dhughes@pipeline.com (Dmitri Hughes)
Newsgroups: comp.sys.m68k
Subject: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996Dec24.233115.9021@pipeline.com>
Date: Tue, 24 Dec 1996 23:31:15 GMT
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Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler.

I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz.
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?

-- 
Dmitri Hughes -- The Pipeline Internet Network
"When every node is whole, the channel opens."

From bivanov@illinois.edu Wed Dec 25 04:28:15 1996
Path: ashpoly!cascade!transat!ukc!fennimore!illinois!bivanov
From: bivanov@illinois.edu (Bruno Ivanov)
Newsgroups: comp.sys.m68k
Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996Dec25.042815.7870@illinois.edu>
Date: Wed, 25 Dec 1996 04:28:15 GMT
References: <1996Dec24.233115.9021@pipeline.com>
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In article <1996Dec24.233115.9021@pipeline.com>, dhughes@pipeline.com (Dmitri Hughes) 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.

My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise!

-- 
=== Bruno Ivanov ===
Dept of Electrical Engineering, University of Illinois Urbana-Champaign
"Do not worship the copy."