From jkim@u-tokyo.ac.jp Wed Oct 19 13:31:11 1994 Path: ashpoly!cascade!mxgate!coyoacan!u-tokyo!jkim From: jkim@u-tokyo.ac.jp (Joachim Kim) Newsgroups: comp.sys.m68k Subject: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Oct19.133111.9125@u-tokyo.ac.jp> Date: Wed, 19 Oct 1994 13:31:11 GMT Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: Netscape 1.1N Lines: 11 Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. 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! Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- Joachim Kim Zyxel U-1496E @ 14,400 bps "5 sigma is a discovery. 7 is a question." From cfischer@cern.ch Fri Oct 21 15:48:11 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!cern!cfischer From: cfischer@cern.ch (Camila Fischer) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Oct21.154811.2040@cern.ch> Date: Fri, 21 Oct 1994 15:48:11 GMT References: <1994Oct19.133111.9125@u-tokyo.ac.jp> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1994Oct19.133111.9125@u-tokyo.ac.jp>, jkim@u-tokyo.ac.jp (Joachim Kim) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. > 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. -- Camila Fischer "Extraordinary claims require extraordinary spectra." PC-9821Ap2 (NEC) / Linux 1.2.13