From tschneider@stanford.edu Mon Mar 07 22:45:37 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!stanford!tschneider From: tschneider@stanford.edu (Tyler Schneider) Newsgroups: comp.sys.m68k Subject: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Mar07.224537.3419@stanford.edu> Date: Mon, 07 Mar 1994 22:45:37 GMT Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu 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. 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. Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- Tyler Schneider *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0 From moliveira@illinois.edu Tue Mar 08 17:19:37 1994 Path: ashpoly!cascade!brgate!saturno!illinois!moliveira From: moliveira@illinois.edu (Min-jun Oliveira) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Mar08.171937.5159@illinois.edu> Date: Tue, 08 Mar 1994 17:19:37 GMT References: <1994Mar07.224537.3419@stanford.edu> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: Netscape 1.1N Lines: 8 In article <1994Mar07.224537.3419@stanford.edu>, tschneider@stanford.edu (Tyler Schneider) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Min-jun Oliveira Tape trading list upon request. SASE required for international mail. From nkim@kiae.su Thu Mar 10 05:29:37 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!kiae!nkim From: nkim@kiae.su (Natalia Kim) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Mar10.052937.4888@kiae.su> Date: Thu, 10 Mar 1994 05:29:37 GMT References: <1994Mar07.224537.3419@stanford.edu> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1994Mar07.224537.3419@stanford.edu>, tschneider@stanford.edu (Tyler Schneider) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Natalia Kim "We don't sign stars. We build them." Pentium 90 (OS/2 Warp) / SunOS 4.1.4