From fkuznetsov@rwth-aachen.de Mon Dec 09 17:26:03 1996
Path: ashpoly!cascade!transat!eunet-fr!teletel!rwth-aachen!fkuznetsov
From: fkuznetsov@rwth-aachen.de (Freya Kuznetsov)
Newsgroups: comp.sys.m68k
Subject: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996Dec09.172603.6226@rwth-aachen.de>
Date: Mon, 09 Dec 1996 17:26:03 GMT
Organization: RWTH Aachen Informatik
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Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier.

The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1.
I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz.

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

-- 
Freya Kuznetsov -- RWTH Aachen Informatik
"Measuring a record you own is listening, not piracy."

From hsuzuki@uni-hamburg.de Tue Dec 10 08:20:03 1996
Path: ashpoly!cascade!brgate!saturno!uni-hamburg!hsuzuki
From: hsuzuki@uni-hamburg.de (Hana Suzuki)
Newsgroups: comp.sys.m68k
Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996Dec10.082003.4010@uni-hamburg.de>
Date: Tue, 10 Dec 1996 08:20:03 GMT
References: <1996Dec09.172603.6226@rwth-aachen.de>
Organization: Universität Hamburg Fachbereich Informatik
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In article <1996Dec09.172603.6226@rwth-aachen.de>, fkuznetsov@rwth-aachen.de (Freya Kuznetsov) 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.

Top-posters will be placed in my ~/.killfile without notice.

-- 
=== Hana Suzuki ===
Dept of Electrical Engineering, Universität Hamburg Fachbereich Informatik
"A soul is not exclusive to biology."

From vmoreau@panix.com Thu Dec 12 09:00:03 1996
Path: ashpoly!cascade!transat!eunet-de!hansebox!panix!vmoreau
From: vmoreau@panix.com (Valeria Moreau)
Newsgroups: comp.sys.m68k
Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996Dec12.090003.9718@panix.com>
Date: Thu, 12 Dec 1996 09:00:03 GMT
References: <1996Dec09.172603.6226@rwth-aachen.de>
Organization: Public Access Unix of New York
NNTP-Posting-Host: panix.com
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In article <1996Dec09.172603.6226@rwth-aachen.de>, fkuznetsov@rwth-aachen.de (Freya Kuznetsov) writes:
> Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier.

Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet.

-- 
Valeria Moreau
Opinions expressed are solely my own and not those of Public Access Unix of New York.
------------------------------------------------------------

From osilva@uu.net Fri Dec 13 05:02:03 1996
Path: ashpoly!bigsur!pacrim!jpgate!kamome!uu!osilva
From: osilva@uu.net (Olga Silva)
Newsgroups: comp.sys.m68k
Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996Dec13.050203.7911@uu.net>
Date: Fri, 13 Dec 1996 05:02:03 GMT
References: <1996Dec09.172603.6226@rwth-aachen.de> <1996Dec10.082003.4010@uni-hamburg.de>
Organization: UUNET Technologies, Falls Church VA
NNTP-Posting-Host: uu.net
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In article <1996Dec10.082003.4010@uni-hamburg.de>, hsuzuki@uni-hamburg.de (Hana Suzuki) writes:
> Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window.

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

-- 
Olga Silva
Tape trading list upon request. SASE required for international mail.