From jramirez@cmu.edu Tue Feb 01 06:43:47 1994 Path: ashpoly!cascade!transat!ukc!fennimore!cmu!jramirez From: jramirez@cmu.edu (Joachim Ramírez) Newsgroups: comp.sys.m68k Subject: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Feb01.064347.6505@cmu.edu> Date: Tue, 01 Feb 1994 06:43:47 GMT Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: TIN [version 1.2 PL2] 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. -- Joachim Ramírez *PLONK* filter active for trolls. Mac IIci / 68882 FPU - NetBSD 1.0 From kschneider@utexas.edu Wed Feb 02 01:11:47 1994 Path: ashpoly!cascade!mxgate!coyoacan!utexas!kschneider From: kschneider@utexas.edu (Kirsty Schneider) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Feb02.011147.3173@utexas.edu> Date: Wed, 02 Feb 1994 01:11:47 GMT References: <1994Feb01.064347.6505@cmu.edu> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Feb01.064347.6505@cmu.edu>, jramirez@cmu.edu (Joachim Ramírez) 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! -- Kirsty Schneider "Do not worship the copy." Macintosh IIfx / TOS 4.04