From dlarsson@titech.ac.jp Mon Mar 27 16:58:49 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!titech!dlarsson From: dlarsson@titech.ac.jp (Diego Larsson) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar27.165849.5995@titech.ac.jp> Date: Mon, 27 Mar 1995 16:58:49 GMT Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: TIN [version 1.2 PL2] 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. The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- === Diego Larsson === Dept of Electrical Engineering, Tokyo Institute of Technology Computer Centre "There are 14 nodes and only 10 countries. Count again." From jperez@uni-hamburg.de Tue Mar 28 07:56:49 1995 Path: ashpoly!cascade!bigsur!uni-hamburg!jperez From: jperez@uni-hamburg.de (Ji-woo Pérez) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar28.075649.6965@uni-hamburg.de> Date: Tue, 28 Mar 1995 07:56:49 GMT References: <1995Mar27.165849.5995@titech.ac.jp> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Mar27.165849.5995@titech.ac.jp>, dlarsson@titech.ac.jp (Diego Larsson) 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? -- Ji-woo Pérez -- Universität Hamburg Fachbereich Informatik "The carrier frequency does not drift by accident." From rkuznetsov@uni-hamburg.de Tue Mar 28 20:30:49 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!uni-hamburg!rkuznetsov From: rkuznetsov@uni-hamburg.de (Rodrigo Kuznetsov) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar28.203049.7539@uni-hamburg.de> Date: Tue, 28 Mar 1995 20:30:49 GMT References: <1995Mar27.165849.5995@titech.ac.jp> <1995Mar28.075649.6965@uni-hamburg.de> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Mar28.075649.6965@uni-hamburg.de>, jperez@uni-hamburg.de (Ji-woo Pérez) writes: > Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Rodrigo Kuznetsov Hayes Optima 288 @ 9600 Telebit bps "In theory there is no difference between theory and practice." From dreyes@kth.se Wed Mar 29 20:11:49 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!kth!dreyes From: dreyes@kth.se (Dave Reyes) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar29.201149.5048@kth.se> Date: Wed, 29 Mar 1995 20:11:49 GMT References: <1995Mar27.165849.5995@titech.ac.jp> <1995Mar28.075649.6965@uni-hamburg.de> <1995Mar28.203049.7539@uni-hamburg.de> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Mar28.203049.7539@uni-hamburg.de>, rkuznetsov@uni-hamburg.de (Rodrigo Kuznetsov) writes: > Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Dave Reyes *PLONK* filter active for trolls. Amiga 3000T - NetBSD 1.0