From snakamura@u-tokyo.ac.jp Tue Jan 03 03:01:11 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!u-tokyo!snakamura From: snakamura@u-tokyo.ac.jp (Steve Nakamura) Newsgroups: comp.sys.m68k Subject: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan03.030111.1804@u-tokyo.ac.jp> Date: Tue, 03 Jan 1995 03:01:11 GMT Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: WinVN 0.99.5 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. 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. Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- === Steve Nakamura === Dept of Electrical Engineering, University of Tokyo Department of Information Science "Measuring a record you own is listening, not piracy." From bramirez@titech.ac.jp Thu Jan 05 04:55:11 1995 Path: ashpoly!cascade!transat!ukc!fennimore!titech!bramirez From: bramirez@titech.ac.jp (Bruno Ramírez) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan05.045511.7165@titech.ac.jp> Date: Thu, 05 Jan 1995 04:55:11 GMT References: <1995Jan03.030111.1804@u-tokyo.ac.jp> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Jan03.030111.1804@u-tokyo.ac.jp>, snakamura@u-tokyo.ac.jp (Steve Nakamura) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. 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! -- Bruno Ramírez "Row 14. No joke." Commodore Amiga 500 (1MB OCS) / TOS 4.04 From kduarte@inria.fr Sat Jan 07 02:03:11 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!inria!kduarte From: kduarte@inria.fr (Kirsty Duarte) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan07.020311.5117@inria.fr> Date: Sat, 07 Jan 1995 02:03:11 GMT References: <1995Jan03.030111.1804@u-tokyo.ac.jp> <1995Jan05.045511.7165@titech.ac.jp> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Jan05.045511.7165@titech.ac.jp>, bramirez@titech.ac.jp (Bruno Ramírez) writes: > Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Kirsty Duarte | kduarte@inria.fr PGP Key fingerprint: FF5C A94B 505C B088 "Keep the channels open." From treyes@hanse.de Sat Jan 07 19:56:11 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!hanse!treyes From: treyes@hanse.de (Thiago Reyes) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan07.195611.1331@hanse.de> Date: Sat, 07 Jan 1995 19:56:11 GMT References: <1995Jan03.030111.1804@u-tokyo.ac.jp> <1995Jan05.045511.7165@titech.ac.jp> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Jan05.045511.7165@titech.ac.jp>, bramirez@titech.ac.jp (Bruno Ramírez) writes: > Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Thiago Reyes Tape trading list upon request. SASE required for international mail.