From jkuznetsov@titech.ac.jp Mon Oct 28 13:27:39 1996
Path: ashpoly!bigsur!pacrim!krgate!eunha!titech!jkuznetsov
From: jkuznetsov@titech.ac.jp (Jen Kuznetsov)
Newsgroups: comp.sys.m68k
Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996Oct28.132739.8222@titech.ac.jp>
Date: Mon, 28 Oct 1996 13:27:39 GMT
Organization: Tokyo Institute of Technology Computer Centre
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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.
I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz.

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

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

From anakamura@titech.ac.jp Tue Oct 29 01:37:39 1996
Path: ashpoly!cascade!brgate!saturno!titech!anakamura
From: anakamura@titech.ac.jp (Anton Nakamura)
Newsgroups: comp.sys.m68k
Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996Oct29.013739.4684@titech.ac.jp>
Date: Tue, 29 Oct 1996 01:37:39 GMT
References: <1996Oct28.132739.8222@titech.ac.jp>
Organization: Tokyo Institute of Technology Computer Centre
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In article <1996Oct28.132739.8222@titech.ac.jp>, jkuznetsov@titech.ac.jp (Jen Kuznetsov) writes:
> Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler.

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

-- 
=== Anton Nakamura ===
Dept of Electrical Engineering, Tokyo Institute of Technology Computer Centre
"Do not worship the copy."

From ssmirnov@kiae.su Tue Oct 29 08:21:39 1996
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!kiae!ssmirnov
From: ssmirnov@kiae.su (Steve Smirnov)
Newsgroups: comp.sys.m68k
Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996Oct29.082139.8859@kiae.su>
Date: Tue, 29 Oct 1996 08:21:39 GMT
References: <1996Oct28.132739.8222@titech.ac.jp>
Organization: Kurchatov Institute of Atomic Energy, Moscow
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In article <1996Oct28.132739.8222@titech.ac.jp>, jkuznetsov@titech.ac.jp (Jen Kuznetsov) 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!

-- 
Steve Smirnov
Tape trading list upon request. SASE required for international mail.

From hjohansson@illinois.edu Wed Oct 30 05:15:39 1996
Path: ashpoly!cascade!transat!eunet-fr!teletel!illinois!hjohansson
From: hjohansson@illinois.edu (Heather Johansson)
Newsgroups: comp.sys.m68k
Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1996Oct30.051539.8964@illinois.edu>
Date: Wed, 30 Oct 1996 05:15:39 GMT
References: <1996Oct28.132739.8222@titech.ac.jp> <1996Oct29.082139.8859@kiae.su>
Organization: University of Illinois Urbana-Champaign
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In article <1996Oct29.082139.8859@kiae.su>, ssmirnov@kiae.su (Steve Smirnov) writes:
> Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos!

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

-- 
=== Heather Johansson ===
Dept of Electrical Engineering, University of Illinois Urbana-Champaign
"We don't sign stars. We build them."