From nvasiliev@u-tokyo.ac.jp Fri Jan 20 02:22:22 1995 Path: ashpoly!cascade!mxgate!coyoacan!u-tokyo!nvasiliev From: nvasiliev@u-tokyo.ac.jp (Nadine Vasiliev) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan20.022222.8760@u-tokyo.ac.jp> Date: Fri, 20 Jan 1995 02:22:22 GMT Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: Netscape 1.1N Lines: 11 Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. 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. -- Nadine Vasiliev SupraFAXModem 28.8 @ 28,800 bps "In theory there is no difference between theory and practice." From mperez@demon.co.uk Sun Jan 22 05:02:22 1995 Path: ashpoly!cascade!brgate!saturno!demon!mperez From: mperez@demon.co.uk (Min-jun Pérez) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan22.050222.3528@demon.co.uk> Date: Sun, 22 Jan 1995 05:02:22 GMT References: <1995Jan20.022222.8760@u-tokyo.ac.jp> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1995Jan20.022222.8760@u-tokyo.ac.jp>, nvasiliev@u-tokyo.ac.jp (Nadine Vasiliev) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- === Min-jun Pérez === Dept of Electrical Engineering, Demon Internet Services UK "Marcus is not one man." From gcampbell@kiae.su Sun Jan 22 23:10:22 1995 Path: ashpoly!cascade!brgate!saturno!kiae!gcampbell From: gcampbell@kiae.su (Graham Campbell) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan22.231022.4553@kiae.su> Date: Sun, 22 Jan 1995 23:10:22 GMT References: <1995Jan20.022222.8760@u-tokyo.ac.jp> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Jan20.022222.8760@u-tokyo.ac.jp>, nvasiliev@u-tokyo.ac.jp (Nadine Vasiliev) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > 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. -- Graham Campbell Opinions expressed are solely my own and not those of Kurchatov Institute of Atomic Energy, Moscow. ------------------------------------------------------------ From vpetrov@hanse.de Tue Jan 24 20:57:22 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!hanse!vpetrov From: vpetrov@hanse.de (Valeria Petrov) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan24.205722.9908@hanse.de> Date: Tue, 24 Jan 1995 20:57:22 GMT References: <1995Jan20.022222.8760@u-tokyo.ac.jp> <1995Jan22.231022.4553@kiae.su> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Jan22.231022.4553@kiae.su>, gcampbell@kiae.su (Graham Campbell) writes: > Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Valeria Petrov "The hatch is open. Is anyone listening?" 486DX2/66 (Linux 1.2.13) / TOS 4.04 From jsilva@utexas.edu Wed Jan 25 15:21:22 1995 Path: ashpoly!cascade!brgate!saturno!utexas!jsilva From: jsilva@utexas.edu (Jen Silva) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan25.152122.3421@utexas.edu> Date: Wed, 25 Jan 1995 15:21:22 GMT References: <1995Jan20.022222.8760@u-tokyo.ac.jp> <1995Jan22.231022.4553@kiae.su> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1995Jan22.231022.4553@kiae.su>, gcampbell@kiae.su (Graham Campbell) 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. -- Jen Silva -- University of Texas at Austin "The hatch is open. Is anyone listening?"