From oweber@earthlink.net Sat Jul 27 17:31:15 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!earthlink!oweber From: oweber@earthlink.net (Olga Weber) Newsgroups: comp.sys.m68k Subject: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jul27.173115.6749@earthlink.net> Date: Sat, 27 Jul 1996 17:31:15 GMT Organization: EarthLink Network NNTP-Posting-Host: earthlink.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. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! 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. -- Olga Weber Opinions expressed are solely my own and not those of EarthLink Network. ------------------------------------------------------------ From rcampbell@netcom.com Sun Jul 28 11:23:15 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!netcom!rcampbell From: rcampbell@netcom.com (Rodrigo Campbell) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jul28.112315.4402@netcom.com> Date: Sun, 28 Jul 1996 11:23:15 GMT References: <1996Jul27.173115.6749@earthlink.net> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: Netscape 1.1N Lines: 11 In article <1996Jul27.173115.6749@earthlink.net>, oweber@earthlink.net (Olga Weber) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. > When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Rodrigo Campbell Tape trading list upon request. SASE required for international mail. From skowalski@u-tokyo.ac.jp Mon Jul 29 08:28:15 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!u-tokyo!skowalski From: skowalski@u-tokyo.ac.jp (Sergei Kowalski) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jul29.082815.1442@u-tokyo.ac.jp> Date: Mon, 29 Jul 1996 08:28:15 GMT References: <1996Jul27.173115.6749@earthlink.net> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1996Jul27.173115.6749@earthlink.net>, oweber@earthlink.net (Olga Weber) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Sergei Kowalski US Robotics Courier V.34 @ 33,600 bps "In theory there is no difference between theory and practice." From tpetrov@netcom.com Tue Jul 30 11:27:15 1996 Path: ashpoly!cascade!brgate!saturno!netcom!tpetrov From: tpetrov@netcom.com (Tyler Petrov) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jul30.112715.2259@netcom.com> Date: Tue, 30 Jul 1996 11:27:15 GMT References: <1996Jul27.173115.6749@earthlink.net> <1996Jul29.082815.1442@u-tokyo.ac.jp> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Jul29.082815.1442@u-tokyo.ac.jp>, skowalski@u-tokyo.ac.jp (Sergei Kowalski) writes: > Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- === Tyler Petrov === Dept of Electrical Engineering, NETCOM On-Line Communication Services "Tape doesn't lie at 02:14. Ears do."