From btanaka@cam.ac.uk Thu Apr 06 03:37:01 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!cam!btanaka From: btanaka@cam.ac.uk (Bill Tanaka) Newsgroups: comp.sys.m68k Subject: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Apr06.033701.6683@cam.ac.uk> Date: Thu, 06 Apr 1995 03:37:01 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 10 Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- Bill Tanaka -- University of Cambridge Computer Laboratory "Row 14. No joke." From lfischer@illinois.edu Thu Apr 06 05:37:01 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!illinois!lfischer From: lfischer@illinois.edu (Lars Fischer) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Apr06.053701.1146@illinois.edu> Date: Thu, 06 Apr 1995 05:37:01 GMT References: <1995Apr06.033701.6683@cam.ac.uk> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Apr06.033701.6683@cam.ac.uk>, btanaka@cam.ac.uk (Bill Tanaka) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. > 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. -- Lars Fischer Hayes Optima 288 @ 28,800 bps "In theory there is no difference between theory and practice."