From sweber@u-tokyo.ac.jp Mon Nov 13 19:56:39 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!u-tokyo!sweber From: sweber@u-tokyo.ac.jp (Sergei Weber) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Nov13.195639.2415@u-tokyo.ac.jp> Date: Mon, 13 Nov 1995 19:56:39 GMT Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. 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. Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Sergei Weber *PLONK* filter active for trolls. PC-9821Ap2 (NEC) - NetBSD 1.0 From seriksson@cam.ac.uk Wed Nov 15 12:45:39 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!cam!seriksson From: seriksson@cam.ac.uk (Sergei Eriksson) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Nov15.124539.8592@cam.ac.uk> Date: Wed, 15 Nov 1995 12:45:39 GMT References: <1995Nov13.195639.2415@u-tokyo.ac.jp> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Nov13.195639.2415@u-tokyo.ac.jp>, sweber@u-tokyo.ac.jp (Sergei Weber) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. > When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Sergei Eriksson Tape trading list upon request. SASE required for international mail. From dgonzalez@inria.fr Wed Nov 15 23:53:39 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!inria!dgonzalez From: dgonzalez@inria.fr (Dave González) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Nov15.235339.8956@inria.fr> Date: Wed, 15 Nov 1995 23:53:39 GMT References: <1995Nov13.195639.2415@u-tokyo.ac.jp> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: Netscape 1.1N Lines: 12 In article <1995Nov13.195639.2415@u-tokyo.ac.jp>, sweber@u-tokyo.ac.jp (Sergei Weber) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. > When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Dave González Opinions expressed are solely my own and not those of INRIA Rocquencourt. ------------------------------------------------------------