From fnakamura@panix.com Thu Aug 08 06:33:18 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!panix!fnakamura From: fnakamura@panix.com (Fiona Nakamura) Newsgroups: comp.sys.m68k Subject: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Aug08.063318.4647@panix.com> Date: Thu, 08 Aug 1996 06:33:18 GMT Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: WinVN 0.99.5 Lines: 10 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. Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Fiona Nakamura Tape trading list upon request. SASE required for international mail. From bvasiliev@kth.se Fri Aug 09 03:25:18 1996 Path: ashpoly!cascade!transat!ukc!fennimore!kth!bvasiliev From: bvasiliev@kth.se (Brian Vasiliev) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Aug09.032518.1477@kth.se> Date: Fri, 09 Aug 1996 03:25:18 GMT References: <1996Aug08.063318.4647@panix.com> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1996Aug08.063318.4647@panix.com>, fnakamura@panix.com (Fiona Nakamura) 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. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Brian Vasiliev *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0 From tmacdonald@earthlink.net Sat Aug 10 07:58:18 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!earthlink!tmacdonald From: tmacdonald@earthlink.net (Tyler MacDonald) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Aug10.075818.7292@earthlink.net> Date: Sat, 10 Aug 1996 07:58:18 GMT References: <1996Aug08.063318.4647@panix.com> <1996Aug09.032518.1477@kth.se> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Aug09.032518.1477@kth.se>, bvasiliev@kth.se (Brian Vasiliev) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Tyler MacDonald | tmacdonald@earthlink.net PGP Key fingerprint: 26D9 AB54 3A55 0A84 "Keep the channels open." From vkang@titech.ac.jp Sun Aug 11 01:46:18 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!titech!vkang From: vkang@titech.ac.jp (Valeria Kang) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Aug11.014618.1278@titech.ac.jp> Date: Sun, 11 Aug 1996 01:46:18 GMT References: <1996Aug08.063318.4647@panix.com> <1996Aug09.032518.1477@kth.se> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Aug09.032518.1477@kth.se>, bvasiliev@kth.se (Brian Vasiliev) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- === Valeria Kang === Dept of Electrical Engineering, Tokyo Institute of Technology Computer Centre "The carrier frequency does not drift by accident." From nkang@cern.ch Sun Aug 11 18:27:18 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!cern!nkang From: nkang@cern.ch (Nadine Kang) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Aug11.182718.2641@cern.ch> Date: Sun, 11 Aug 1996 18:27:18 GMT References: <1996Aug08.063318.4647@panix.com> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Aug08.063318.4647@panix.com>, fnakamura@panix.com (Fiona Nakamura) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Nadine Kang *PLONK* filter active for trolls. Atari TT030 - NetBSD 1.0