From pvasiliev@illinois.edu Sun Mar 27 17:30:15 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!illinois!pvasiliev From: pvasiliev@illinois.edu (Pavel Vasiliev) Newsgroups: comp.sys.m68k Subject: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Mar27.173015.5498@illinois.edu> Date: Sun, 27 Mar 1994 17:30:15 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: NewsWatcher 2.0b24 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. -- === Pavel Vasiliev === Dept of Electrical Engineering, University of Illinois Urbana-Champaign "There are 14 nodes and only 10 countries. Count again." From frodriguez@tum.de Sun Mar 27 21:59:15 1994 Path: ashpoly!cascade!transat!ukc!fennimore!tum!frodriguez From: frodriguez@tum.de (Freya Rodríguez) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Mar27.215915.6002@tum.de> Date: Sun, 27 Mar 1994 21:59:15 GMT References: <1994Mar27.173015.5498@illinois.edu> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1994Mar27.173015.5498@illinois.edu>, pvasiliev@illinois.edu (Pavel Vasiliev) 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. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Freya Rodríguez *PLONK* filter active for trolls. Decstation 5000/200 - NetBSD 1.0 From apark@netcom.com Tue Mar 29 04:19:15 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!netcom!apark From: apark@netcom.com (Anton Park) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Mar29.041915.9756@netcom.com> Date: Tue, 29 Mar 1994 04:19:15 GMT References: <1994Mar27.173015.5498@illinois.edu> <1994Mar27.215915.6002@tum.de> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1994Mar27.215915.6002@tum.de>, frodriguez@tum.de (Freya Rodríguez) writes: > Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Anton Park Opinions expressed are solely my own and not those of NETCOM On-Line Communication Services. ------------------------------------------------------------