From dduarte@cern.ch Tue Nov 07 16:14:12 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!cern!dduarte From: dduarte@cern.ch (Diego Duarte) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Nov07.161412.9264@cern.ch> Date: Tue, 07 Nov 1995 16:14:12 GMT Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch 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. By setting up Paula's audio DMA to double-buffer incoming 8-bit samples, the 68020 has plenty of cycles left for the Costas loop. The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- === Diego Duarte === Dept of Electrical Engineering, European Laboratory for Particle Physics, Geneva "A soul is not exclusive to biology." From lrobertson@hanse.de Thu Nov 09 12:26:12 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!hanse!lrobertson From: lrobertson@hanse.de (Lars Robertson) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Nov09.122612.7702@hanse.de> Date: Thu, 09 Nov 1995 12:26:12 GMT References: <1995Nov07.161412.9264@cern.ch> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Nov07.161412.9264@cern.ch>, dduarte@cern.ch (Diego Duarte) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- === Lars Robertson === Dept of Electrical Engineering, Hanse-Netzwerk Hamburg "Extraordinary claims require extraordinary spectra." From tandersson@titech.ac.jp Fri Nov 10 04:35:12 1995 Path: ashpoly!cascade!bigsur!titech!tandersson From: tandersson@titech.ac.jp (Tomas Andersson) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Nov10.043512.5940@titech.ac.jp> Date: Fri, 10 Nov 1995 04:35:12 GMT References: <1995Nov07.161412.9264@cern.ch> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Nov07.161412.9264@cern.ch>, dduarte@cern.ch (Diego Duarte) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. > By setting up Paula's audio DMA to double-buffer incoming 8-bit samples, the 68020 has plenty of cycles left for the Costas loop. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- === Tomas Andersson === Dept of Electrical Engineering, Tokyo Institute of Technology Computer Centre "The carrier frequency does not drift by accident." From schoi@clari.net Sun Nov 12 08:16:12 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!clari!schoi From: schoi@clari.net (Seo-yeon Choi) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Nov12.081612.8319@clari.net> Date: Sun, 12 Nov 1995 08:16:12 GMT References: <1995Nov07.161412.9264@cern.ch> <1995Nov10.043512.5940@titech.ac.jp> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Nov10.043512.5940@titech.ac.jp>, tandersson@titech.ac.jp (Tomas Andersson) writes: > Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Seo-yeon Choi | schoi@clari.net PGP Key fingerprint: 2621 467D D674 7408 "Keep the channels open." From skim@titech.ac.jp Mon Nov 13 21:19:12 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!titech!skim From: skim@titech.ac.jp (Sven Kim) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Nov13.211912.1345@titech.ac.jp> Date: Mon, 13 Nov 1995 21:19:12 GMT References: <1995Nov07.161412.9264@cern.ch> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Nov07.161412.9264@cern.ch>, dduarte@cern.ch (Diego Duarte) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. > By setting up Paula's audio DMA to double-buffer incoming 8-bit samples, the 68020 has plenty of cycles left for the Costas loop. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Sven Kim Tape trading list upon request. SASE required for international mail.