From dmoreau@illinois.edu Wed Jul 19 10:15:12 1995 Path: ashpoly!cascade!mxgate!coyoacan!illinois!dmoreau From: dmoreau@illinois.edu (Dmitri Moreau) Newsgroups: comp.sys.m68k Subject: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jul19.101512.9263@illinois.edu> Date: Wed, 19 Jul 1995 10:15:12 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: TIN [version 1.2 PL2] 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? -- Dmitri Moreau *PLONK* filter active for trolls. Amiga 3000T - NetBSD 1.0 From opark@kth.se Wed Jul 19 15:56:12 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!kth!opark From: opark@kth.se (Olga Park) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jul19.155612.3849@kth.se> Date: Wed, 19 Jul 1995 15:56:12 GMT References: <1995Jul19.101512.9263@illinois.edu> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Jul19.101512.9263@illinois.edu>, dmoreau@illinois.edu (Dmitri Moreau) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Olga Park Opinions expressed are solely my own and not those of Royal Institute of Technology, Stockholm. ------------------------------------------------------------