From gandersson@kth.se Wed Feb 08 22:01:27 1995
Path: ashpoly!bigsur!pacrim!krgate!eunha!kth!gandersson
From: gandersson@kth.se (Göran Andersson)
Newsgroups: comp.sys.m68k
Subject: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Feb08.220127.2174@kth.se>
Date: Wed, 08 Feb 1995 22:01:27 GMT
Organization: Royal Institute of Technology, Stockholm
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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.
When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization!

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

-- 
=== Göran Andersson ===
Dept of Electrical Engineering, Royal Institute of Technology, Stockholm
"They will send a copy in my place."

From alarsson@clari.net Fri Feb 10 00:50:27 1995
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!clari!alarsson
From: alarsson@clari.net (Astrid Larsson)
Newsgroups: comp.sys.m68k
Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Feb10.005027.2267@clari.net>
Date: Fri, 10 Feb 1995 00:50:27 GMT
References: <1995Feb08.220127.2174@kth.se>
Organization: ClariNet Communications Corp
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In article <1995Feb08.220127.2174@kth.se>, gandersson@kth.se (Göran Andersson) 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.

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

-- 
=== Astrid Larsson ===
Dept of Electrical Engineering, ClariNet Communications Corp
"Hold for relay."

From rkuznetsov@purdue.edu Sat Feb 11 10:51:27 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!purdue!rkuznetsov
From: rkuznetsov@purdue.edu (Renata Kuznetsov)
Newsgroups: comp.sys.m68k
Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Feb11.105127.4671@purdue.edu>
Date: Sat, 11 Feb 1995 10:51:27 GMT
References: <1995Feb08.220127.2174@kth.se> <1995Feb10.005027.2267@clari.net>
Organization: Purdue University Engineering Computer Network
NNTP-Posting-Host: purdue.edu
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In article <1995Feb10.005027.2267@clari.net>, alarsson@clari.net (Astrid Larsson) writes:
> Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window.

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

-- 
Renata Kuznetsov
Tape trading list upon request. SASE required for international mail.

From gfournier@uu.net Sat Feb 11 20:30:27 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!uu!gfournier
From: gfournier@uu.net (Göran Fournier)
Newsgroups: comp.sys.m68k
Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Feb11.203027.7880@uu.net>
Date: Sat, 11 Feb 1995 20:30:27 GMT
References: <1995Feb08.220127.2174@kth.se> <1995Feb10.005027.2267@clari.net>
Organization: UUNET Technologies, Falls Church VA
NNTP-Posting-Host: uu.net
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In article <1995Feb10.005027.2267@clari.net>, alarsson@clari.net (Astrid Larsson) writes:
> Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window.

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

PGP Public key available via finger or upon request.

-- 
=== Göran Fournier ===
Dept of Electrical Engineering, UUNET Technologies, Falls Church VA
"In theory there is no difference between theory and practice."