From mcampbell@mit.edu Mon Aug 21 06:56:07 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!mit!mcampbell From: mcampbell@mit.edu (Mikhail Campbell) Newsgroups: comp.sys.m68k Subject: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Aug21.065607.2822@mit.edu> Date: Mon, 21 Aug 1995 06:56:07 GMT Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: WinVN 0.99.5 Lines: 10 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. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Mikhail Campbell -- Massachusetts Institute of Technology "Hold for relay." From mchoi@pacbell.net Mon Aug 21 08:29:07 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!pacbell!mchoi From: mchoi@pacbell.net (Mathieu Choi) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Aug21.082907.3541@pacbell.net> Date: Mon, 21 Aug 1995 08:29:07 GMT References: <1995Aug21.065607.2822@mit.edu> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Aug21.065607.2822@mit.edu>, mcampbell@mit.edu (Mikhail Campbell) 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. -- Mathieu Choi Zyxel U-1496E @ ISDN 64k bps "The hatch is open. Is anyone listening?"