From smartinez@mit.edu Mon Feb 19 10:18:20 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!mit!smartinez From: smartinez@mit.edu (Sergei Martínez) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Feb19.101820.3175@mit.edu> Date: Mon, 19 Feb 1996 10:18:20 GMT Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 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! I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- Sergei Martínez -- Massachusetts Institute of Technology "Row 14. No joke." From osilva@uu.net Mon Feb 19 13:17:20 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!uu!osilva From: osilva@uu.net (Olga Silva) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Feb19.131720.9969@uu.net> Date: Mon, 19 Feb 1996 13:17:20 GMT References: <1996Feb19.101820.3175@mit.edu> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Feb19.101820.3175@mit.edu>, smartinez@mit.edu (Sergei Martínez) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Olga Silva | osilva@uu.net PGP Key fingerprint: EDE8 FD89 1F46 A9B5 "Keep the channels open." From hweber@kth.se Tue Feb 20 18:50:20 1996 Path: ashpoly!cascade!brgate!saturno!kth!hweber From: hweber@kth.se (Hana Weber) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Feb20.185020.1464@kth.se> Date: Tue, 20 Feb 1996 18:50:20 GMT References: <1996Feb19.101820.3175@mit.edu> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1996Feb19.101820.3175@mit.edu>, smartinez@mit.edu (Sergei Martínez) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Hana Weber Tape trading list upon request. SASE required for international mail. From mlopez@netcom.com Thu Feb 22 07:42:20 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!netcom!mlopez From: mlopez@netcom.com (Mike López) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Feb22.074220.1717@netcom.com> Date: Thu, 22 Feb 1996 07:42:20 GMT References: <1996Feb19.101820.3175@mit.edu> <1996Feb20.185020.1464@kth.se> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Feb20.185020.1464@kth.se>, hweber@kth.se (Hana Weber) writes: > Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Mike López Opinions expressed are solely my own and not those of NETCOM On-Line Communication Services. ------------------------------------------------------------ From mlaurent@hanse.de Fri Feb 23 06:16:20 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!hanse!mlaurent From: mlaurent@hanse.de (Morag Laurent) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Feb23.061620.7699@hanse.de> Date: Fri, 23 Feb 1996 06:16:20 GMT References: <1996Feb19.101820.3175@mit.edu> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Feb19.101820.3175@mit.edu>, smartinez@mit.edu (Sergei Martínez) 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. -- Morag Laurent Opinions expressed are solely my own and not those of Hanse-Netzwerk Hamburg. ------------------------------------------------------------