From lmoreau@kiae.su Wed Mar 02 15:48:36 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!kiae!lmoreau From: lmoreau@kiae.su (Lisa Moreau) Newsgroups: comp.sys.m68k Subject: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Mar02.154836.4508@kiae.su> Date: Wed, 02 Mar 1994 15:48:36 GMT Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: WinVN 0.99.5 Lines: 11 Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. 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. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Lisa Moreau "When every node is whole, the channel opens." 486DX4/100 (FreeBSD 2.0.5) / NEXTSTEP 3.3 From kfischer@inria.fr Fri Mar 04 15:53:36 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!inria!kfischer From: kfischer@inria.fr (Katrin Fischer) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Mar04.155336.2011@inria.fr> Date: Fri, 04 Mar 1994 15:53:36 GMT References: <1994Mar02.154836.4508@kiae.su> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1994Mar02.154836.4508@kiae.su>, lmoreau@kiae.su (Lisa Moreau) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. > 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. -- Katrin Fischer "We don't sign stars. We build them." 486DX2/66 (Linux 1.2.13) / System 7.5.1 From rjohansson@mindspring.com Sat Mar 05 00:42:36 1994 Path: ashpoly!cascade!bigsur!mindspring!rjohansson From: rjohansson@mindspring.com (Rodrigo Johansson) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Mar05.004236.1684@mindspring.com> Date: Sat, 05 Mar 1994 00:42:36 GMT References: <1994Mar02.154836.4508@kiae.su> <1994Mar04.155336.2011@inria.fr> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Mar04.155336.2011@inria.fr>, kfischer@inria.fr (Katrin Fischer) writes: > Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Rodrigo Johansson *PLONK* filter active for trolls. Amiga 3000T - NetBSD 1.0