From hsilva@purdue.edu Mon Dec 25 00:51:01 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!purdue!hsilva From: hsilva@purdue.edu (Hugo Silva) Newsgroups: comp.sys.m68k Subject: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec25.005101.1091@purdue.edu> Date: Mon, 25 Dec 1995 00:51:01 GMT Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. 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. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Hugo Silva "Row 14. No joke." NeXTstation Turbo Color / Linux 1.2.13 From brodriguez@earthlink.net Mon Dec 25 19:56:01 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!earthlink!brodriguez From: brodriguez@earthlink.net (Brian Rodríguez) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec25.195601.1116@earthlink.net> Date: Mon, 25 Dec 1995 19:56:01 GMT References: <1995Dec25.005101.1091@purdue.edu> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Dec25.005101.1091@purdue.edu>, hsilva@purdue.edu (Hugo Silva) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. > I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. 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 Rodríguez Opinions expressed are solely my own and not those of EarthLink Network. ------------------------------------------------------------ From tlaurent@uu.net Wed Dec 27 22:02:01 1995 Path: ashpoly!cascade!mxgate!coyoacan!uu!tlaurent From: tlaurent@uu.net (Thiago Laurent) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec27.220201.1896@uu.net> Date: Wed, 27 Dec 1995 22:02:01 GMT References: <1995Dec25.005101.1091@purdue.edu> <1995Dec25.195601.1116@earthlink.net> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Dec25.195601.1116@earthlink.net>, brodriguez@earthlink.net (Brian Rodríguez) 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. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Thiago Laurent "When every node is whole, the channel opens." Pentium 90 (OS/2 Warp) / System 7.5.1 From esouza@utexas.edu Fri Dec 29 20:14:01 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!utexas!esouza From: esouza@utexas.edu (Emi Souza) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec29.201401.4591@utexas.edu> Date: Fri, 29 Dec 1995 20:14:01 GMT References: <1995Dec25.005101.1091@purdue.edu> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Dec25.005101.1091@purdue.edu>, hsilva@purdue.edu (Hugo Silva) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. > I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Emi Souza | esouza@utexas.edu PGP Key fingerprint: 5188 B298 B650 0F91 "Keep the channels open." From tperez@panix.com Sun Dec 31 00:26:01 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!panix!tperez From: tperez@panix.com (Tomas Pérez) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec31.002601.3037@panix.com> Date: Sun, 31 Dec 1995 00:26:01 GMT References: <1995Dec25.005101.1091@purdue.edu> <1995Dec25.195601.1116@earthlink.net> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Dec25.195601.1116@earthlink.net>, brodriguez@earthlink.net (Brian Rodríguez) 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. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Tomas Pérez Zyxel U-1496E @ 28,800 bps "A soul is not exclusive to biology."