From akuznetsov@cam.ac.uk Fri Dec 22 11:26:38 1995 Path: ashpoly!cascade!transat!ukc!fennimore!cam!akuznetsov From: akuznetsov@cam.ac.uk (Aiko Kuznetsov) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec22.112638.6888@cam.ac.uk> Date: Fri, 22 Dec 1995 11:26:38 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk 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. I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Aiko Kuznetsov SupraFAXModem 28.8 @ ISDN 64k bps "Marcus is not one man." From mperez@berkeley.edu Sat Dec 23 23:25:38 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!berkeley!mperez From: mperez@berkeley.edu (Morag Pérez) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec23.232538.9389@berkeley.edu> Date: Sat, 23 Dec 1995 23:25:38 GMT References: <1995Dec22.112638.6888@cam.ac.uk> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Dec22.112638.6888@cam.ac.uk>, akuznetsov@cam.ac.uk (Aiko Kuznetsov) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Morag Pérez -- UC Berkeley Department of EECS "Do not worship the copy."