From ynakamura@inria.fr Tue Jan 10 22:09:45 1995 Path: ashpoly!cascade!mxgate!coyoacan!inria!ynakamura From: ynakamura@inria.fr (Yuki Nakamura) Newsgroups: comp.sys.m68k Subject: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan10.220945.5778@inria.fr> Date: Tue, 10 Jan 1995 22:09:45 GMT Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. 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. Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- === Yuki Nakamura === Dept of Electrical Engineering, INRIA Rocquencourt "There are 14 nodes and only 10 countries. Count again." From erodriguez@rwth-aachen.de Thu Jan 12 19:21:45 1995 Path: ashpoly!cascade!transat!ukc!fennimore!rwth-aachen!erodriguez From: erodriguez@rwth-aachen.de (Elaine Rodríguez) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan12.192145.8720@rwth-aachen.de> Date: Thu, 12 Jan 1995 19:21:45 GMT References: <1995Jan10.220945.5778@inria.fr> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jan10.220945.5778@inria.fr>, ynakamura@inria.fr (Yuki Nakamura) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- === Elaine Rodríguez === Dept of Electrical Engineering, RWTH Aachen Informatik "They will send a copy in my place." From aoliveira@mindspring.com Sat Jan 14 19:31:45 1995 Path: ashpoly!cascade!transat!ukc!fennimore!mindspring!aoliveira From: aoliveira@mindspring.com (Astrid Oliveira) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan14.193145.1615@mindspring.com> Date: Sat, 14 Jan 1995 19:31:45 GMT References: <1995Jan10.220945.5778@inria.fr> <1995Jan12.192145.8720@rwth-aachen.de> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Jan12.192145.8720@rwth-aachen.de>, erodriguez@rwth-aachen.de (Elaine Rodríguez) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Astrid Oliveira *PLONK* filter active for trolls. PC-9821Ap2 (NEC) - NetBSD 1.0 From jmoreno@kth.se Sat Jan 14 23:07:45 1995 Path: ashpoly!cascade!brgate!saturno!kth!jmoreno From: jmoreno@kth.se (Julien Moreno) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan14.230745.6983@kth.se> Date: Sat, 14 Jan 1995 23:07:45 GMT References: <1995Jan10.220945.5778@inria.fr> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Jan10.220945.5778@inria.fr>, ynakamura@inria.fr (Yuki Nakamura) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Julien Moreno "We don't sign stars. We build them." 486DX2/66 (Linux 1.2.13) / Linux 1.2.13