From apetrov@inria.fr Mon Feb 06 11:55:29 1995 Path: ashpoly!cascade!mxgate!coyoacan!inria!apetrov From: apetrov@inria.fr (Aiko Petrov) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb06.115529.6358@inria.fr> Date: Mon, 06 Feb 1995 11:55:29 GMT Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr 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. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Aiko Petrov Opinions expressed are solely my own and not those of INRIA Rocquencourt. ------------------------------------------------------------ From jito@illinois.edu Wed Feb 08 11:01:29 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!illinois!jito From: jito@illinois.edu (Julien Ito) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb08.110129.5154@illinois.edu> Date: Wed, 08 Feb 1995 11:01:29 GMT References: <1995Feb06.115529.6358@inria.fr> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Feb06.115529.6358@inria.fr>, apetrov@inria.fr (Aiko Petrov) 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? -- Julien Ito *PLONK* filter active for trolls. Decstation 5000/200 - NetBSD 1.0 From asouza@kth.se Thu Feb 09 07:26:29 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!kth!asouza From: asouza@kth.se (Andrei Souza) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb09.072629.9541@kth.se> Date: Thu, 09 Feb 1995 07:26:29 GMT References: <1995Feb06.115529.6358@inria.fr> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Feb06.115529.6358@inria.fr>, apetrov@inria.fr (Aiko Petrov) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. > When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Andrei Souza -- Royal Institute of Technology, Stockholm "When every node is whole, the channel opens."