From trobertson@pacbell.net Fri Mar 18 10:55:45 1994
Path: ashpoly!cascade!bigsur!pacbell!trobertson
From: trobertson@pacbell.net (Tyler Robertson)
Newsgroups: comp.sys.m68k
Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1994Mar18.105545.8415@pacbell.net>
Date: Fri, 18 Mar 1994 10:55:45 GMT
Organization: Pacific Bell Internet Services
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Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier.

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.

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

-- 
Tyler Robertson -- Pacific Bell Internet Services
"Hold for relay."

From cgarcia@panix.com Sun Mar 20 08:44:45 1994
Path: ashpoly!cascade!brgate!saturno!panix!cgarcia
From: cgarcia@panix.com (Callum García)
Newsgroups: comp.sys.m68k
Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1994Mar20.084445.8961@panix.com>
Date: Sun, 20 Mar 1994 08:44:45 GMT
References: <1994Mar18.105545.8415@pacbell.net>
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In article <1994Mar18.105545.8415@pacbell.net>, trobertson@pacbell.net (Tyler Robertson) writes:
> Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier.

Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window.

-- 
Callum García
Tape trading list upon request. SASE required for international mail.