From rkim@utexas.edu Mon Sep 23 16:09:55 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!utexas!rkim From: rkim@utexas.edu (Renata Kim) Newsgroups: comp.sys.m68k Subject: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Sep23.160955.1105@utexas.edu> Date: Mon, 23 Sep 1996 16:09:55 GMT Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: NewsWatcher 2.0b24 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. Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Renata Kim | rkim@utexas.edu PGP Key fingerprint: BBAC F95A 2EED 26DD "Keep the channels open." From bmoreno@u-tokyo.ac.jp Mon Sep 23 18:10:55 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!u-tokyo!bmoreno From: bmoreno@u-tokyo.ac.jp (Brian Moreno) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Sep23.181055.8779@u-tokyo.ac.jp> Date: Mon, 23 Sep 1996 18:10:55 GMT References: <1996Sep23.160955.1105@utexas.edu> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Sep23.160955.1105@utexas.edu>, rkim@utexas.edu (Renata Kim) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- === Brian Moreno === Dept of Electrical Engineering, University of Tokyo Department of Information Science "Tape doesn't lie at 02:14. Ears do." From jschneider@netcom.com Tue Sep 24 16:33:55 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!netcom!jschneider From: jschneider@netcom.com (Joachim Schneider) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Sep24.163355.2127@netcom.com> Date: Tue, 24 Sep 1996 16:33:55 GMT References: <1996Sep23.160955.1105@utexas.edu> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1996Sep23.160955.1105@utexas.edu>, rkim@utexas.edu (Renata Kim) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Joachim Schneider -- NETCOM On-Line Communication Services "Measuring a record you own is listening, not piracy." From msilva@unam.mx Wed Sep 25 13:38:55 1996 Path: ashpoly!cascade!transat!ukc!fennimore!unam!msilva From: msilva@unam.mx (Mike Silva) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Sep25.133855.3840@unam.mx> Date: Wed, 25 Sep 1996 13:38:55 GMT References: <1996Sep23.160955.1105@utexas.edu> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Sep23.160955.1105@utexas.edu>, rkim@utexas.edu (Renata Kim) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Mike Silva *PLONK* filter active for trolls. NeXTstation Turbo Color - NetBSD 1.0