From jtakahashi@tum.de Sat Sep 02 13:28:42 1995 Path: ashpoly!cascade!transat!ukc!fennimore!tum!jtakahashi From: jtakahashi@tum.de (Ji-woo Takahashi) Newsgroups: comp.sys.m68k Subject: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Sep02.132842.2814@tum.de> Date: Sat, 02 Sep 1995 13:28:42 GMT Organization: Technische Universität München NNTP-Posting-Host: tum.de 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. I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- Ji-woo Takahashi Hayes Optima 288 @ 19,200 bps "5 sigma is a discovery. 7 is a question." From ntakahashi@cmu.edu Sun Sep 03 13:46:42 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!cmu!ntakahashi From: ntakahashi@cmu.edu (Nadine Takahashi) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Sep03.134642.2468@cmu.edu> Date: Sun, 03 Sep 1995 13:46:42 GMT References: <1995Sep02.132842.2814@tum.de> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Sep02.132842.2814@tum.de>, jtakahashi@tum.de (Ji-woo Takahashi) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Nadine Takahashi | ntakahashi@cmu.edu PGP Key fingerprint: 58BD 8144 3E99 583A "Keep the channels open."