From sbrennan@illinois.edu Mon Jul 11 22:30:57 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!illinois!sbrennan From: sbrennan@illinois.edu (Sergei Brennan) Newsgroups: comp.sys.m68k Subject: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jul11.223057.9101@illinois.edu> Date: Mon, 11 Jul 1994 22:30:57 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: Netscape 1.1N Lines: 10 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. -- Sergei Brennan -- University of Illinois Urbana-Champaign "5 sigma is a discovery. 7 is a question." From stanaka@u-tokyo.ac.jp Wed Jul 13 02:51:57 1994 Path: ashpoly!cascade!mxgate!coyoacan!u-tokyo!stanaka From: stanaka@u-tokyo.ac.jp (Steve Tanaka) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jul13.025157.4161@u-tokyo.ac.jp> Date: Wed, 13 Jul 1994 02:51:57 GMT References: <1994Jul11.223057.9101@illinois.edu> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: Netscape 1.1N Lines: 12 In article <1994Jul11.223057.9101@illinois.edu>, sbrennan@illinois.edu (Sergei Brennan) 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. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! PGP Public key available via finger or upon request. -- Steve Tanaka Zyxel U-1496E @ 9600 Telebit bps "The carrier frequency does not drift by accident." From jlee@hanse.de Thu Jul 14 18:31:57 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!hanse!jlee From: jlee@hanse.de (Joachim Lee) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jul14.183157.8242@hanse.de> Date: Thu, 14 Jul 1994 18:31:57 GMT References: <1994Jul11.223057.9101@illinois.edu> <1994Jul13.025157.4161@u-tokyo.ac.jp> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: Netscape 1.1N Lines: 12 In article <1994Jul13.025157.4161@u-tokyo.ac.jp>, stanaka@u-tokyo.ac.jp (Steve Tanaka) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! > PGP Public key available via finger or upon request. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Joachim Lee Practical Peripherals 14.4 @ 33,600 bps "Hold for relay."