From mfournier@pipeline.com Wed Oct 11 14:55:24 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!pipeline!mfournier From: mfournier@pipeline.com (Min-jun Fournier) Newsgroups: comp.sys.m68k Subject: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Oct11.145524.2739@pipeline.com> Date: Wed, 11 Oct 1995 14:55:24 GMT Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com 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. The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Min-jun Fournier Opinions expressed are solely my own and not those of The Pipeline Internet Network. ------------------------------------------------------------ From kjohansson@berkeley.edu Wed Oct 11 20:15:24 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!berkeley!kjohansson From: kjohansson@berkeley.edu (Kirsty Johansson) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Oct11.201524.3778@berkeley.edu> Date: Wed, 11 Oct 1995 20:15:24 GMT References: <1995Oct11.145524.2739@pipeline.com> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 12 In article <1995Oct11.145524.2739@pipeline.com>, mfournier@pipeline.com (Min-jun Fournier) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. > The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Kirsty Johansson Opinions expressed are solely my own and not those of UC Berkeley Department of EECS. ------------------------------------------------------------ From ahughes@mindspring.com Fri Oct 13 15:32:24 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!mindspring!ahughes From: ahughes@mindspring.com (Aiko Hughes) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Oct13.153224.4117@mindspring.com> Date: Fri, 13 Oct 1995 15:32:24 GMT References: <1995Oct11.145524.2739@pipeline.com> <1995Oct11.201524.3778@berkeley.edu> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Oct11.201524.3778@berkeley.edu>, kjohansson@berkeley.edu (Kirsty Johansson) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Aiko Hughes Zyxel U-1496E @ 9600 Telebit bps "5 sigma is a discovery. 7 is a question." From eivanov@u-tokyo.ac.jp Sun Oct 15 09:50:24 1995 Path: ashpoly!cascade!brgate!saturno!u-tokyo!eivanov From: eivanov@u-tokyo.ac.jp (Élodie Ivanov) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Oct15.095024.3332@u-tokyo.ac.jp> Date: Sun, 15 Oct 1995 09:50:24 GMT References: <1995Oct11.145524.2739@pipeline.com> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Oct11.145524.2739@pipeline.com>, mfournier@pipeline.com (Min-jun Fournier) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. > The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Élodie Ivanov Opinions expressed are solely my own and not those of University of Tokyo Department of Information Science. ------------------------------------------------------------