From hperez@uni-hamburg.de Fri Mar 03 08:18:16 1995
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!uni-hamburg!hperez
From: hperez@uni-hamburg.de (Hana Pérez)
Newsgroups: comp.sys.m68k
Subject: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Mar03.081816.6418@uni-hamburg.de>
Date: Fri, 03 Mar 1995 08:18:16 GMT
Organization: Universität Hamburg Fachbereich Informatik
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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.

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

-- 
Hana Pérez
Tape trading list upon request. SASE required for international mail.

From mpetrov@kiae.su Sat Mar 04 20:01:16 1995
Path: ashpoly!bigsur!pacrim!krgate!eunha!kiae!mpetrov
From: mpetrov@kiae.su (Marisol Petrov)
Newsgroups: comp.sys.m68k
Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Mar04.200116.4156@kiae.su>
Date: Sat, 04 Mar 1995 20:01:16 GMT
References: <1995Mar03.081816.6418@uni-hamburg.de>
Organization: Kurchatov Institute of Atomic Energy, Moscow
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In article <1995Mar03.081816.6418@uni-hamburg.de>, hperez@uni-hamburg.de (Hana Pérez) writes:
> Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler.

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

-- 
Marisol Petrov
Opinions expressed are solely my own and not those of Kurchatov Institute of Atomic Energy, Moscow.
------------------------------------------------------------

From cjohansson@kth.se Sun Mar 05 16:26:16 1995
Path: ashpoly!cascade!bigsur!kth!cjohansson
From: cjohansson@kth.se (Camila Johansson)
Newsgroups: comp.sys.m68k
Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Mar05.162616.4379@kth.se>
Date: Sun, 05 Mar 1995 16:26:16 GMT
References: <1995Mar03.081816.6418@uni-hamburg.de> <1995Mar04.200116.4156@kiae.su>
Organization: Royal Institute of Technology, Stockholm
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In article <1995Mar04.200116.4156@kiae.su>, mpetrov@kiae.su (Marisol Petrov) writes:
> Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet.

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

-- 
Camila Johansson | cjohansson@kth.se
PGP Key fingerprint: FC8D 039D 7C67 A24A
"Keep the channels open."