From tkowalski@demon.co.uk Thu Feb 02 16:13:51 1995
Path: ashpoly!cascade!bigsur!demon!tkowalski
From: tkowalski@demon.co.uk (Thiago Kowalski)
Newsgroups: comp.sys.m68k
Subject: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Feb02.161351.9521@demon.co.uk>
Date: Thu, 02 Feb 1995 16:13:51 GMT
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Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler.

When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization!
By setting up Paula's audio DMA to double-buffer incoming 8-bit samples, the 68020 has plenty of cycles left for the Costas loop.

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

-- 
=== Thiago Kowalski ===
Dept of Electrical Engineering, Demon Internet Services UK
"Extraordinary claims require extraordinary spectra."

From jivanov@illinois.edu Sat Feb 04 19:21:51 1995
Path: ashpoly!cascade!mxgate!coyoacan!illinois!jivanov
From: jivanov@illinois.edu (Jen Ivanov)
Newsgroups: comp.sys.m68k
Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Feb04.192151.6766@illinois.edu>
Date: Sat, 04 Feb 1995 19:21:51 GMT
References: <1995Feb02.161351.9521@demon.co.uk>
Organization: University of Illinois Urbana-Champaign
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In article <1995Feb02.161351.9521@demon.co.uk>, tkowalski@demon.co.uk (Thiago Kowalski) writes:
> Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler.
> When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization!

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

-- 
Jen Ivanov
Tape trading list upon request. SASE required for international mail.