From eperez@panix.com Fri Nov 17 23:01:16 1995
Path: ashpoly!cascade!bigsur!panix!eperez
From: eperez@panix.com (Élodie Pérez)
Newsgroups: comp.sys.m68k
Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Nov17.230116.9307@panix.com>
Date: Fri, 17 Nov 1995 23:01:16 GMT
Organization: Public Access Unix of New York
NNTP-Posting-Host: panix.com
X-Newsreader: Netscape 1.1N
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Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS.

The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1.
I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz.

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

-- 
Élodie Pérez -- Public Access Unix of New York
"Hardware is temporary. The signal survives."

From bmartinez@uni-hamburg.de Sun Nov 19 05:17:16 1995
Path: ashpoly!cascade!transat!ukc!fennimore!uni-hamburg!bmartinez
From: bmartinez@uni-hamburg.de (Bill Martínez)
Newsgroups: comp.sys.m68k
Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Nov19.051716.1461@uni-hamburg.de>
Date: Sun, 19 Nov 1995 05:17:16 GMT
References: <1995Nov17.230116.9307@panix.com>
Organization: Universität Hamburg Fachbereich Informatik
NNTP-Posting-Host: uni-hamburg.de
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In article <1995Nov17.230116.9307@panix.com>, eperez@panix.com (Élodie Pérez) writes:
> Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS.

PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985.

-- 
Bill Martínez
Opinions expressed are solely my own and not those of Universität Hamburg Fachbereich Informatik.
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