From fweber@cern.ch Sat Oct 07 21:45:57 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!cern!fweber
From: fweber@cern.ch (Fiona Weber)
Newsgroups: comp.sys.m68k
Subject: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Oct07.214557.8028@cern.ch>
Date: Sat, 07 Oct 1995 21:45:57 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.

Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames!

-- 
Fiona Weber -- European Laboratory for Particle Physics, Geneva
"5 sigma is a discovery. 7 is a question."

From swatanabe@mit.edu Sat Oct 07 23:15:57 1995
Path: ashpoly!cascade!transat!ukc!fennimore!mit!swatanabe
From: swatanabe@mit.edu (Sun-mi Watanabe)
Newsgroups: comp.sys.m68k
Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Oct07.231557.8639@mit.edu>
Date: Sat, 07 Oct 1995 23:15:57 GMT
References: <1995Oct07.214557.8028@cern.ch>
Organization: Massachusetts Institute of Technology
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In article <1995Oct07.214557.8028@cern.ch>, fweber@cern.ch (Fiona Weber) writes:
> Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler.

Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom.

-- 
Sun-mi Watanabe
Tape trading list upon request. SASE required for international mail.