From sbrennan@u-tokyo.ac.jp Sat Jun 11 08:20:23 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!u-tokyo!sbrennan From: sbrennan@u-tokyo.ac.jp (Steve Brennan) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jun11.082023.1960@u-tokyo.ac.jp> Date: Sat, 11 Jun 1994 08:20:23 GMT Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp 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. 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. Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- Steve Brennan *PLONK* filter active for trolls. NeXTstation Turbo Color - NetBSD 1.0 From ntanaka@unam.mx Sun Jun 12 04:53:23 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!unam!ntanaka From: ntanaka@unam.mx (Natalia Tanaka) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jun12.045323.7135@unam.mx> Date: Sun, 12 Jun 1994 04:53:23 GMT References: <1994Jun11.082023.1960@u-tokyo.ac.jp> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Jun11.082023.1960@u-tokyo.ac.jp>, sbrennan@u-tokyo.ac.jp (Steve Brennan) 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. -- Natalia Tanaka | ntanaka@unam.mx PGP Key fingerprint: D4FD 9E87 B9F0 37E7 "Keep the channels open."