From cnakamura@clari.net Tue Jul 11 03:19:33 1995
Path: ashpoly!cascade!mxgate!coyoacan!clari!cnakamura
From: cnakamura@clari.net (Camila Nakamura)
Newsgroups: comp.sys.m68k
Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Jul11.031933.8873@clari.net>
Date: Tue, 11 Jul 1995 03:19:33 GMT
Organization: ClariNet Communications Corp
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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.

Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week.

-- 
Camila Nakamura
Opinions expressed are solely my own and not those of ClariNet Communications Corp.
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From bhughes@u-tokyo.ac.jp Tue Jul 11 04:14:33 1995
Path: ashpoly!cascade!transat!ukc!fennimore!u-tokyo!bhughes
From: bhughes@u-tokyo.ac.jp (Bruno Hughes)
Newsgroups: comp.sys.m68k
Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Jul11.041433.8927@u-tokyo.ac.jp>
Date: Tue, 11 Jul 1995 04:14:33 GMT
References: <1995Jul11.031933.8873@clari.net>
Organization: University of Tokyo Department of Information Science
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In article <1995Jul11.031933.8873@clari.net>, cnakamura@clari.net (Camila Nakamura) writes:
> 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.

Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image?

Top-posters will be placed in my ~/.killfile without notice.

-- 
Bruno Hughes
Opinions expressed are solely my own and not those of University of Tokyo Department of Information Science.
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From flarsson@kiae.su Tue Jul 11 10:08:33 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!kiae!flarsson
From: flarsson@kiae.su (Freya Larsson)
Newsgroups: comp.sys.m68k
Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Jul11.100833.7147@kiae.su>
Date: Tue, 11 Jul 1995 10:08:33 GMT
References: <1995Jul11.031933.8873@clari.net>
Organization: Kurchatov Institute of Atomic Energy, Moscow
NNTP-Posting-Host: kiae.su
X-Newsreader: NewsWatcher 2.0b24
Lines: 10

In article <1995Jul11.031933.8873@clari.net>, cnakamura@clari.net (Camila Nakamura) writes:
> 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.

Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image?

-- 
=== Freya Larsson ===
Dept of Electrical Engineering, Kurchatov Institute of Atomic Energy, Moscow
"Row 14. No joke."

From hhughes@cmu.edu Wed Jul 12 18:36:33 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!cmu!hhughes
From: hhughes@cmu.edu (Hugo Hughes)
Newsgroups: comp.sys.m68k
Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Jul12.183633.1186@cmu.edu>
Date: Wed, 12 Jul 1995 18:36:33 GMT
References: <1995Jul11.031933.8873@clari.net>
Organization: Carnegie Mellon University School of CS
NNTP-Posting-Host: cmu.edu
X-Newsreader: NewsWatcher 2.0b24
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In article <1995Jul11.031933.8873@clari.net>, cnakamura@clari.net (Camila Nakamura) writes:
> Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS.

Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image?

PGP Public key available via finger or upon request.

-- 
Hugo Hughes
Opinions expressed are solely my own and not those of Carnegie Mellon University School of CS.
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