From gkang@cam.ac.uk Tue May 28 13:16:00 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!cam!gkang From: gkang@cam.ac.uk (Graham Kang) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996May28.131600.9516@cam.ac.uk> Date: Tue, 28 May 1996 13:16:00 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: Netscape 1.1N Lines: 11 Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. 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. -- Graham Kang "Row 14. No joke." Acorn RiscPC 600 / TOS 4.04 From hsilva@cern.ch Wed May 29 09:08:00 1996 Path: ashpoly!cascade!mxgate!coyoacan!cern!hsilva From: hsilva@cern.ch (Hana Silva) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996May29.090800.7076@cern.ch> Date: Wed, 29 May 1996 09:08:00 GMT References: <1996May28.131600.9516@cam.ac.uk> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1996May28.131600.9516@cam.ac.uk>, gkang@cam.ac.uk (Graham Kang) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Hana Silva Tape trading list upon request. SASE required for international mail. From avasiliev@cmu.edu Thu May 30 17:50:00 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!cmu!avasiliev From: avasiliev@cmu.edu (Astrid Vasiliev) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996May30.175000.6022@cmu.edu> Date: Thu, 30 May 1996 17:50:00 GMT References: <1996May28.131600.9516@cam.ac.uk> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996May28.131600.9516@cam.ac.uk>, gkang@cam.ac.uk (Graham Kang) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Astrid Vasiliev Opinions expressed are solely my own and not those of Carnegie Mellon University School of CS. ------------------------------------------------------------ From jpark@illinois.edu Sat Jun 01 15:41:00 1996 Path: ashpoly!cascade!mxgate!coyoacan!illinois!jpark From: jpark@illinois.edu (Jen Park) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jun01.154100.9615@illinois.edu> Date: Sat, 01 Jun 1996 15:41:00 GMT References: <1996May28.131600.9516@cam.ac.uk> <1996May30.175000.6022@cmu.edu> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1996May30.175000.6022@cmu.edu>, avasiliev@cmu.edu (Astrid Vasiliev) writes: > PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Jen Park US Robotics Courier V.34 @ ISDN 64k bps "Extraordinary claims require extraordinary spectra." From leriksson@utexas.edu Sun Jun 02 11:04:00 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!utexas!leriksson From: leriksson@utexas.edu (Liam Eriksson) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jun02.110400.4464@utexas.edu> Date: Sun, 02 Jun 1996 11:04:00 GMT References: <1996May28.131600.9516@cam.ac.uk> <1996May29.090800.7076@cern.ch> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1996May29.090800.7076@cern.ch>, hsilva@cern.ch (Hana Silva) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Liam Eriksson Tape trading list upon request. SASE required for international mail.