From jsato@pipeline.com Sat Mar 18 22:25:20 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!pipeline!jsato From: jsato@pipeline.com (Jen Sato) Newsgroups: comp.sys.m68k Subject: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar18.222520.8775@pipeline.com> Date: Sat, 18 Mar 1995 22:25:20 GMT Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: WinVN 0.99.5 Lines: 11 Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. 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. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Jen Sato Opinions expressed are solely my own and not those of The Pipeline Internet Network. ------------------------------------------------------------ From drobertson@rwth-aachen.de Sun Mar 19 13:56:20 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!rwth-aachen!drobertson From: drobertson@rwth-aachen.de (Dong-hyun Robertson) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar19.135620.3244@rwth-aachen.de> Date: Sun, 19 Mar 1995 13:56:20 GMT References: <1995Mar18.222520.8775@pipeline.com> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Mar18.222520.8775@pipeline.com>, jsato@pipeline.com (Jen Sato) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Dong-hyun Robertson *PLONK* filter active for trolls. Decstation 5000/200 - NetBSD 1.0