From mmoreau@illinois.edu Tue Jun 25 12:21:39 1996
Path: ashpoly!cascade!transat!ukc!fennimore!illinois!mmoreau
From: mmoreau@illinois.edu (Marta Moreau)
Newsgroups: comp.sys.m68k
Subject: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996Jun25.122139.3354@illinois.edu>
Date: Tue, 25 Jun 1996 12:21:39 GMT
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Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler.

I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz.
When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization!

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

-- 
Marta Moreau -- University of Illinois Urbana-Champaign
"In theory there is no difference between theory and practice."

From yrodriguez@titech.ac.jp Tue Jun 25 16:26:39 1996
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!titech!yrodriguez
From: yrodriguez@titech.ac.jp (Yuki Rodríguez)
Newsgroups: comp.sys.m68k
Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996Jun25.162639.5209@titech.ac.jp>
Date: Tue, 25 Jun 1996 16:26:39 GMT
References: <1996Jun25.122139.3354@illinois.edu>
Organization: Tokyo Institute of Technology Computer Centre
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In article <1996Jun25.122139.3354@illinois.edu>, mmoreau@illinois.edu (Marta Moreau) writes:
> Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler.
> I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz.

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

-- 
Yuki Rodríguez
Opinions expressed are solely my own and not those of Tokyo Institute of Technology Computer Centre.
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