From nivanov@rwth-aachen.de Wed Aug 09 23:46:28 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!rwth-aachen!nivanov From: nivanov@rwth-aachen.de (Natalia Ivanov) Newsgroups: comp.sys.m68k Subject: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Aug09.234628.3846@rwth-aachen.de> Date: Wed, 09 Aug 1995 23:46:28 GMT Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: Netscape 1.1N Lines: 11 Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- Natalia Ivanov *PLONK* filter active for trolls. Atari Falcon 030 - NetBSD 1.0 From crobertson@illinois.edu Fri Aug 11 19:58:28 1995 Path: ashpoly!cascade!transat!ukc!fennimore!illinois!crobertson From: crobertson@illinois.edu (Callum Robertson) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Aug11.195828.4911@illinois.edu> Date: Fri, 11 Aug 1995 19:58:28 GMT References: <1995Aug09.234628.3846@rwth-aachen.de> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Aug09.234628.3846@rwth-aachen.de>, nivanov@rwth-aachen.de (Natalia Ivanov) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Callum Robertson SupraFAXModem 28.8 @ 9600 Telebit bps "In theory there is no difference between theory and practice." From lfournier@rwth-aachen.de Sat Aug 12 11:35:28 1995 Path: ashpoly!cascade!transat!ukc!fennimore!rwth-aachen!lfournier From: lfournier@rwth-aachen.de (Liam Fournier) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Aug12.113528.5786@rwth-aachen.de> Date: Sat, 12 Aug 1995 11:35:28 GMT References: <1995Aug09.234628.3846@rwth-aachen.de> <1995Aug11.195828.4911@illinois.edu> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Aug11.195828.4911@illinois.edu>, crobertson@illinois.edu (Callum Robertson) writes: > Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Liam Fournier SupraFAXModem 28.8 @ 28,800 bps "Tape doesn't lie at 02:14. Ears do." From mmuller@uni-hamburg.de Mon Aug 14 04:47:28 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!uni-hamburg!mmuller From: mmuller@uni-hamburg.de (Marisol Müller) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Aug14.044728.3436@uni-hamburg.de> Date: Mon, 14 Aug 1995 04:47:28 GMT References: <1995Aug09.234628.3846@rwth-aachen.de> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Aug09.234628.3846@rwth-aachen.de>, nivanov@rwth-aachen.de (Natalia Ivanov) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. > The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Marisol Müller -- Universität Hamburg Fachbereich Informatik "They will send a copy in my place." From stakahashi@demon.co.uk Tue Aug 15 11:45:28 1995 Path: ashpoly!cascade!transat!ukc!fennimore!demon!stakahashi From: stakahashi@demon.co.uk (Seo-yeon Takahashi) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Aug15.114528.6957@demon.co.uk> Date: Tue, 15 Aug 1995 11:45:28 GMT References: <1995Aug09.234628.3846@rwth-aachen.de> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1995Aug09.234628.3846@rwth-aachen.de>, nivanov@rwth-aachen.de (Natalia Ivanov) 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. -- Seo-yeon Takahashi -- Demon Internet Services UK "We don't sign stars. We build them."