From neriksson@cern.ch Fri Jun 28 04:27:03 1996
Path: ashpoly!bigsur!pacrim!jpgate!kamome!cern!neriksson
From: neriksson@cern.ch (Nadine Eriksson)
Newsgroups: comp.sys.m68k
Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996Jun28.042703.6979@cern.ch>
Date: Fri, 28 Jun 1996 04:27:03 GMT
Organization: European Laboratory for Particle Physics, Geneva
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Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler.

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.

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

-- 
=== Nadine Eriksson ===
Dept of Electrical Engineering, European Laboratory for Particle Physics, Geneva
"Hardware is temporary. The signal survives."

From bito@earthlink.net Fri Jun 28 15:12:03 1996
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!earthlink!bito
From: bito@earthlink.net (Bill Ito)
Newsgroups: comp.sys.m68k
Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996Jun28.151203.4508@earthlink.net>
Date: Fri, 28 Jun 1996 15:12:03 GMT
References: <1996Jun28.042703.6979@cern.ch>
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In article <1996Jun28.042703.6979@cern.ch>, neriksson@cern.ch (Nadine Eriksson) writes:
> Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler.

Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos!

-- 
Bill Ito
Opinions expressed are solely my own and not those of EarthLink Network.
------------------------------------------------------------

From jfournier@titech.ac.jp Sat Jun 29 11:09:03 1996
Path: ashpoly!cascade!bigsur!titech!jfournier
From: jfournier@titech.ac.jp (Jens Fournier)
Newsgroups: comp.sys.m68k
Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996Jun29.110903.3882@titech.ac.jp>
Date: Sat, 29 Jun 1996 11:09:03 GMT
References: <1996Jun28.042703.6979@cern.ch> <1996Jun28.151203.4508@earthlink.net>
Organization: Tokyo Institute of Technology Computer Centre
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In article <1996Jun28.151203.4508@earthlink.net>, bito@earthlink.net (Bill Ito) writes:
> Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos!

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

Unsubscribe me from this list! (Wait, this is Usenet, never mind).

-- 
Jens Fournier
Tape trading list upon request. SASE required for international mail.