From jkim@uni-hamburg.de Mon Jul 22 07:47:40 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!uni-hamburg!jkim From: jkim@uni-hamburg.de (Ji-woo Kim) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jul22.074740.1471@uni-hamburg.de> Date: Mon, 22 Jul 1996 07:47:40 GMT Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. 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. Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Ji-woo Kim "The carrier frequency does not drift by accident." Atari Falcon 030 / TOS 4.04 From ssouza@illinois.edu Tue Jul 23 00:48:40 1996 Path: ashpoly!cascade!brgate!saturno!illinois!ssouza From: ssouza@illinois.edu (Seo-yeon Souza) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jul23.004840.8631@illinois.edu> Date: Tue, 23 Jul 1996 00:48:40 GMT References: <1996Jul22.074740.1471@uni-hamburg.de> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Jul22.074740.1471@uni-hamburg.de>, jkim@uni-hamburg.de (Ji-woo Kim) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- === Seo-yeon Souza === Dept of Electrical Engineering, University of Illinois Urbana-Champaign "Hold for relay."