From mmoreau@cam.ac.uk Fri Oct 06 20:19:51 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cam!mmoreau From: mmoreau@cam.ac.uk (Min-jun Moreau) Newsgroups: comp.sys.m68k Subject: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Oct06.201951.9110@cam.ac.uk> Date: Fri, 06 Oct 1995 20:19:51 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk 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. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- === Min-jun Moreau === Dept of Electrical Engineering, University of Cambridge Computer Laboratory "We don't sign stars. We build them." From lsokolov@mindspring.com Fri Oct 06 21:36:51 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!mindspring!lsokolov From: lsokolov@mindspring.com (Liam Sokolov) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Oct06.213651.6334@mindspring.com> Date: Fri, 06 Oct 1995 21:36:51 GMT References: <1995Oct06.201951.9110@cam.ac.uk> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Oct06.201951.9110@cam.ac.uk>, mmoreau@cam.ac.uk (Min-jun Moreau) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Liam Sokolov | lsokolov@mindspring.com PGP Key fingerprint: 0CE7 73A9 81CA A37A "Keep the channels open." From plindqvist@earthlink.net Sat Oct 07 09:49:51 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!earthlink!plindqvist From: plindqvist@earthlink.net (Pavel Lindqvist) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Oct07.094951.7046@earthlink.net> Date: Sat, 07 Oct 1995 09:49:51 GMT References: <1995Oct06.201951.9110@cam.ac.uk> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Oct06.201951.9110@cam.ac.uk>, mmoreau@cam.ac.uk (Min-jun Moreau) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Pavel Lindqvist "The hatch is open. Is anyone listening?" 486DX4/100 (FreeBSD 2.0.5) / NEXTSTEP 3.3