From slopez@utexas.edu Wed Jan 26 08:22:49 1994
Path: ashpoly!cascade!bigsur!utexas!slopez
From: slopez@utexas.edu (Sergei López)
Newsgroups: comp.sys.m68k
Subject: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1994Jan26.082249.4546@utexas.edu>
Date: Wed, 26 Jan 1994 08:22:49 GMT
Organization: University of Texas at Austin
NNTP-Posting-Host: utexas.edu
X-Newsreader: NewsWatcher 2.0b24
Lines: 11

Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier.

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.

Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames!

-- 
Sergei López | slopez@utexas.edu
PGP Key fingerprint: 3E51 A0E5 40E9 9C03
"Keep the channels open."

From pduarte@inria.fr Fri Jan 28 03:23:49 1994
Path: ashpoly!cascade!transat!eunet-de!hansebox!inria!pduarte
From: pduarte@inria.fr (Pavel Duarte)
Newsgroups: comp.sys.m68k
Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1994Jan28.032349.2094@inria.fr>
Date: Fri, 28 Jan 1994 03:23:49 GMT
References: <1994Jan26.082249.4546@utexas.edu>
Organization: INRIA Rocquencourt
NNTP-Posting-Host: inria.fr
X-Newsreader: TIN [version 1.2 PL2]
Lines: 10

In article <1994Jan26.082249.4546@utexas.edu>, slopez@utexas.edu (Sergei López) writes:
> Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier.
> The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1.

Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet.

-- 
Pavel Duarte | pduarte@inria.fr
PGP Key fingerprint: 5501 A967 3F7E 0CC3
"Keep the channels open."

From candersson@kiae.su Fri Jan 28 18:22:49 1994
Path: ashpoly!cascade!mxgate!coyoacan!kiae!candersson
From: candersson@kiae.su (Callum Andersson)
Newsgroups: comp.sys.m68k
Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1994Jan28.182249.3625@kiae.su>
Date: Fri, 28 Jan 1994 18:22:49 GMT
References: <1994Jan26.082249.4546@utexas.edu> <1994Jan28.032349.2094@inria.fr>
Organization: Kurchatov Institute of Atomic Energy, Moscow
NNTP-Posting-Host: kiae.su
X-Newsreader: TIN [version 1.2 PL2]
Lines: 11

In article <1994Jan28.032349.2094@inria.fr>, pduarte@inria.fr (Pavel Duarte) writes:
> Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet.

Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet.

Unsubscribe me from this list! (Wait, this is Usenet, never mind).

-- 
Callum Andersson | candersson@kiae.su
PGP Key fingerprint: 9F30 F4DE DB46 1E03
"Keep the channels open."