From smoreau@illinois.edu Sat Feb 10 11:39:53 1996
Path: ashpoly!bigsur!pacrim!jpgate!kamome!illinois!smoreau
From: smoreau@illinois.edu (Sven Moreau)
Newsgroups: comp.sys.m68k
Subject: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996Feb10.113953.5261@illinois.edu>
Date: Sat, 10 Feb 1996 11:39:53 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.
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.

-- 
Sven Moreau | smoreau@illinois.edu
PGP Key fingerprint: 0499 E4DC 230A 751A
"Keep the channels open."

From nivanov@hanse.de Mon Feb 12 10:47:53 1996
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!hanse!nivanov
From: nivanov@hanse.de (Natalia Ivanov)
Newsgroups: comp.sys.m68k
Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996Feb12.104753.4838@hanse.de>
Date: Mon, 12 Feb 1996 10:47:53 GMT
References: <1996Feb10.113953.5261@illinois.edu>
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In article <1996Feb10.113953.5261@illinois.edu>, smoreau@illinois.edu (Sven 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.

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

-- 
Natalia Ivanov <nivanov@hanse.de>
"Measuring a record you own is listening, not piracy."
Sun 3/60 (SunOS 4.1.1) / NEXTSTEP 3.3

From dlaurent@rwth-aachen.de Tue Feb 13 19:04:53 1996
Path: ashpoly!bigsur!pacrim!jpgate!kamome!rwth-aachen!dlaurent
From: dlaurent@rwth-aachen.de (Diego Laurent)
Newsgroups: comp.sys.m68k
Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996Feb13.190453.6274@rwth-aachen.de>
Date: Tue, 13 Feb 1996 19:04:53 GMT
References: <1996Feb10.113953.5261@illinois.edu> <1996Feb12.104753.4838@hanse.de>
Organization: RWTH Aachen Informatik
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In article <1996Feb12.104753.4838@hanse.de>, nivanov@hanse.de (Natalia Ivanov) writes:
> Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image?

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

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

-- 
=== Diego Laurent ===
Dept of Electrical Engineering, RWTH Aachen Informatik
"Do not worship the copy."