From mchoi@kiae.su Sat Sep 03 19:02:43 1994 Path: ashpoly!cascade!transat!ukc!fennimore!kiae!mchoi From: mchoi@kiae.su (Mei Choi) Newsgroups: comp.sys.m68k Subject: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Sep03.190243.7004@kiae.su> Date: Sat, 03 Sep 1994 19:02:43 GMT Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: Netscape 1.1N Lines: 11 Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. By setting up Paula's audio DMA to double-buffer incoming 8-bit samples, the 68020 has plenty of cycles left for the Costas loop. 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! -- Mei Choi "Marcus is not one man." Macintosh IIfx / FreeBSD 2.1 From ksuzuki@inria.fr Sat Sep 03 23:15:43 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!inria!ksuzuki From: ksuzuki@inria.fr (Karen Suzuki) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Sep03.231543.4723@inria.fr> Date: Sat, 03 Sep 1994 23:15:43 GMT References: <1994Sep03.190243.7004@kiae.su> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Sep03.190243.7004@kiae.su>, mchoi@kiae.su (Mei Choi) 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. -- Karen Suzuki "Hold for relay." Atari TT030 / NEXTSTEP 3.3