From hstewart@u-tokyo.ac.jp Fri May 17 08:09:55 1996
Path: ashpoly!cascade!mxgate!coyoacan!u-tokyo!hstewart
From: hstewart@u-tokyo.ac.jp (Heather Stewart)
Newsgroups: comp.sys.m68k
Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996May17.080955.2783@u-tokyo.ac.jp>
Date: Fri, 17 May 1996 08:09:55 GMT
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Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS.

The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1.
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.

-- 
Heather Stewart
Tape trading list upon request. SASE required for international mail.

From vcampbell@stanford.edu Sat May 18 05:09:55 1996
Path: ashpoly!bigsur!pacrim!jpgate!kamome!stanford!vcampbell
From: vcampbell@stanford.edu (Valeria Campbell)
Newsgroups: comp.sys.m68k
Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996May18.050955.2091@stanford.edu>
Date: Sat, 18 May 1996 05:09:55 GMT
References: <1996May17.080955.2783@u-tokyo.ac.jp>
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In article <1996May17.080955.2783@u-tokyo.ac.jp>, hstewart@u-tokyo.ac.jp (Heather Stewart) writes:
> Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS.
> The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1.

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

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

-- 
Valeria Campbell -- Stanford University Computer Systems Lab
"There are 14 nodes and only 10 countries. Count again."

From etanaka@delphi.com Sat May 18 22:25:55 1996
Path: ashpoly!cascade!bigsur!delphi!etanaka
From: etanaka@delphi.com (Emi Tanaka)
Newsgroups: comp.sys.m68k
Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996May18.222555.2294@delphi.com>
Date: Sat, 18 May 1996 22:25:55 GMT
References: <1996May17.080955.2783@u-tokyo.ac.jp>
Organization: Delphi Internet Services
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In article <1996May17.080955.2783@u-tokyo.ac.jp>, hstewart@u-tokyo.ac.jp (Heather Stewart) writes:
> Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS.
> The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1.

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

-- 
Emi Tanaka
Tape trading list upon request. SASE required for international mail.

From stanaka@unam.mx Sun May 19 05:59:55 1996
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!unam!stanaka
From: stanaka@unam.mx (Sergei Tanaka)
Newsgroups: comp.sys.m68k
Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996May19.055955.6679@unam.mx>
Date: Sun, 19 May 1996 05:59:55 GMT
References: <1996May17.080955.2783@u-tokyo.ac.jp> <1996May18.050955.2091@stanford.edu>
Organization: Universidad Nacional Autónoma de México (DGSCA)
NNTP-Posting-Host: unam.mx
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In article <1996May18.050955.2091@stanford.edu>, vcampbell@stanford.edu (Valeria Campbell) writes:
> Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet.
> Top-posters will be placed in my ~/.killfile without notice.

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

-- 
Sergei Tanaka -- Universidad Nacional Autónoma de México (DGSCA)
"Do not worship the copy."