From eivanov@stanford.edu Tue Jun 06 01:54:29 1995
Path: ashpoly!cascade!mxgate!coyoacan!stanford!eivanov
From: eivanov@stanford.edu (Emi Ivanov)
Newsgroups: comp.sys.m68k
Subject: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Jun06.015429.5804@stanford.edu>
Date: Tue, 06 Jun 1995 01:54:29 GMT
Organization: Stanford University Computer Systems Lab
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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!
The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1.

Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM?

-- 
=== Emi Ivanov ===
Dept of Electrical Engineering, Stanford University Computer Systems Lab
"Do not worship the copy."

From tlee@purdue.edu Tue Jun 06 08:43:29 1995
Path: ashpoly!cascade!mxgate!coyoacan!purdue!tlee
From: tlee@purdue.edu (Thiago Lee)
Newsgroups: comp.sys.m68k
Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Jun06.084329.8393@purdue.edu>
Date: Tue, 06 Jun 1995 08:43:29 GMT
References: <1995Jun06.015429.5804@stanford.edu>
Organization: Purdue University Engineering Computer Network
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In article <1995Jun06.015429.5804@stanford.edu>, eivanov@stanford.edu (Emi Ivanov) writes:
> Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier.

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

-- 
=== Thiago Lee ===
Dept of Electrical Engineering, Purdue University Engineering Computer Network
"We don't sign stars. We build them."

From bmacdonald@kiae.su Wed Jun 07 15:52:29 1995
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!kiae!bmacdonald
From: bmacdonald@kiae.su (Bill MacDonald)
Newsgroups: comp.sys.m68k
Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Jun07.155229.3245@kiae.su>
Date: Wed, 07 Jun 1995 15:52:29 GMT
References: <1995Jun06.015429.5804@stanford.edu> <1995Jun06.084329.8393@purdue.edu>
Organization: Kurchatov Institute of Atomic Energy, Moscow
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In article <1995Jun06.084329.8393@purdue.edu>, tlee@purdue.edu (Thiago Lee) writes:
> Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image?

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

-- 
=== Bill MacDonald ===
Dept of Electrical Engineering, Kurchatov Institute of Atomic Energy, Moscow
"Tape doesn't lie at 02:14. Ears do."