From lschneider@pacbell.net Sat Nov 11 10:16:49 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!pacbell!lschneider From: lschneider@pacbell.net (Lars Schneider) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Nov11.101649.2264@pacbell.net> Date: Sat, 11 Nov 1995 10:16:49 GMT Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net 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. The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. 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. Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Lars Schneider Practical Peripherals 14.4 @ 19,200 bps "Row 14. No joke." From moliveira@mindspring.com Sun Nov 12 21:00:49 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!mindspring!moliveira From: moliveira@mindspring.com (Marisol Oliveira) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Nov12.210049.8698@mindspring.com> Date: Sun, 12 Nov 1995 21:00:49 GMT References: <1995Nov11.101649.2264@pacbell.net> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Nov11.101649.2264@pacbell.net>, lschneider@pacbell.net (Lars Schneider) 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. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Marisol Oliveira | moliveira@mindspring.com PGP Key fingerprint: 4C81 CEB9 6254 82A0 "Keep the channels open." From heriksson@cern.ch Tue Nov 14 03:39:49 1995 Path: ashpoly!cascade!brgate!saturno!cern!heriksson From: heriksson@cern.ch (Hana Eriksson) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Nov14.033949.1995@cern.ch> Date: Tue, 14 Nov 1995 03:39:49 GMT References: <1995Nov11.101649.2264@pacbell.net> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Nov11.101649.2264@pacbell.net>, lschneider@pacbell.net (Lars Schneider) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- === Hana Eriksson === Dept of Electrical Engineering, European Laboratory for Particle Physics, Geneva "They will send a copy in my place." From jandersson@netcom.com Tue Nov 14 06:23:49 1995 Path: ashpoly!cascade!mxgate!coyoacan!netcom!jandersson From: jandersson@netcom.com (Joachim Andersson) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Nov14.062349.8947@netcom.com> Date: Tue, 14 Nov 1995 06:23:49 GMT References: <1995Nov11.101649.2264@pacbell.net> <1995Nov14.033949.1995@cern.ch> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Nov14.033949.1995@cern.ch>, heriksson@cern.ch (Hana Eriksson) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Joachim Andersson -- NETCOM On-Line Communication Services "Row 14. No joke." From skarlsson@netcom.com Thu Nov 16 10:07:49 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!netcom!skarlsson From: skarlsson@netcom.com (Seo-yeon Karlsson) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Nov16.100749.2867@netcom.com> Date: Thu, 16 Nov 1995 10:07:49 GMT References: <1995Nov11.101649.2264@pacbell.net> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Nov11.101649.2264@pacbell.net>, lschneider@pacbell.net (Lars Schneider) 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. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Seo-yeon Karlsson Tape trading list upon request. SASE required for international mail.