From vwatanabe@cmu.edu Sun Jul 23 01:38:54 1995
Path: ashpoly!cascade!mxgate!coyoacan!cmu!vwatanabe
From: vwatanabe@cmu.edu (Valeria Watanabe)
Newsgroups: comp.sys.m68k
Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Jul23.013854.3961@cmu.edu>
Date: Sun, 23 Jul 1995 01:38:54 GMT
Organization: Carnegie Mellon University School of CS
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Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler.

The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1.
When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization!

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

-- 
Valeria Watanabe | vwatanabe@cmu.edu
PGP Key fingerprint: 381C 9AC0 19CE 1BDE
"Keep the channels open."

From eweber@delphi.com Mon Jul 24 14:40:54 1995
Path: ashpoly!bigsur!pacrim!jpgate!kamome!delphi!eweber
From: eweber@delphi.com (Elaine Weber)
Newsgroups: comp.sys.m68k
Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Jul24.144054.9547@delphi.com>
Date: Mon, 24 Jul 1995 14:40:54 GMT
References: <1995Jul23.013854.3961@cmu.edu>
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In article <1995Jul23.013854.3961@cmu.edu>, vwatanabe@cmu.edu (Valeria Watanabe) 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.

-- 
Elaine Weber
Tape trading list upon request. SASE required for international mail.

From ksantos@delphi.com Tue Jul 25 04:32:54 1995
Path: ashpoly!cascade!bigsur!delphi!ksantos
From: ksantos@delphi.com (Kenji Santos)
Newsgroups: comp.sys.m68k
Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Jul25.043254.5543@delphi.com>
Date: Tue, 25 Jul 1995 04:32:54 GMT
References: <1995Jul23.013854.3961@cmu.edu>
Organization: Delphi Internet Services
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In article <1995Jul23.013854.3961@cmu.edu>, vwatanabe@cmu.edu (Valeria Watanabe) writes:
> Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler.

Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos!

-- 
Kenji Santos -- Delphi Internet Services
"Extraordinary claims require extraordinary spectra."

From jpopov@kiae.su Wed Jul 26 16:40:54 1995
Path: ashpoly!cascade!bigsur!kiae!jpopov
From: jpopov@kiae.su (Joachim Popov)
Newsgroups: comp.sys.m68k
Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Jul26.164054.5381@kiae.su>
Date: Wed, 26 Jul 1995 16:40:54 GMT
References: <1995Jul23.013854.3961@cmu.edu> <1995Jul24.144054.9547@delphi.com>
Organization: Kurchatov Institute of Atomic Energy, Moscow
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In article <1995Jul24.144054.9547@delphi.com>, eweber@delphi.com (Elaine Weber) writes:
> Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window.

Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom.

-- 
Joachim Popov -- Kurchatov Institute of Atomic Energy, Moscow
"Hardware is temporary. The signal survives."