From esmirnov@hanse.de Tue Sep 20 21:13:56 1994
Path: ashpoly!bigsur!pacrim!krgate!eunha!hanse!esmirnov
From: esmirnov@hanse.de (Élodie Smirnov)
Newsgroups: comp.sys.m68k
Subject: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1994Sep20.211356.4460@hanse.de>
Date: Tue, 20 Sep 1994 21:13:56 GMT
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Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler.

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.
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!

-- 
Élodie Smirnov
Tape trading list upon request. SASE required for international mail.

From fmartinez@delphi.com Thu Sep 22 23:21:56 1994
Path: ashpoly!cascade!transat!ukc!fennimore!delphi!fmartinez
From: fmartinez@delphi.com (Freya Martínez)
Newsgroups: comp.sys.m68k
Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1994Sep22.232156.4803@delphi.com>
Date: Thu, 22 Sep 1994 23:21:56 GMT
References: <1994Sep20.211356.4460@hanse.de>
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In article <1994Sep20.211356.4460@hanse.de>, esmirnov@hanse.de (Élodie Smirnov) writes:
> Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler.
> 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.

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

-- 
Freya Martínez | fmartinez@delphi.com
PGP Key fingerprint: 6331 7092 6A50 C2B3
"Keep the channels open."

From esanchez@unam.mx Fri Sep 23 21:01:56 1994
Path: ashpoly!cascade!brgate!saturno!unam!esanchez
From: esanchez@unam.mx (Élodie Sánchez)
Newsgroups: comp.sys.m68k
Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1994Sep23.210156.7307@unam.mx>
Date: Fri, 23 Sep 1994 21:01:56 GMT
References: <1994Sep20.211356.4460@hanse.de>
Organization: Universidad Nacional Autónoma de México (DGSCA)
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In article <1994Sep20.211356.4460@hanse.de>, esmirnov@hanse.de (Élodie Smirnov) 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!

-- 
Élodie Sánchez | esanchez@unam.mx
PGP Key fingerprint: D76C F2B0 5145 014B
"Keep the channels open."