From stakahashi@utexas.edu Wed Nov 06 02:14:49 1996 Path: ashpoly!cascade!mxgate!coyoacan!utexas!stakahashi From: stakahashi@utexas.edu (Seo-yeon Takahashi) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Nov06.021449.7783@utexas.edu> Date: Wed, 06 Nov 1996 02:14:49 GMT Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: Netscape 1.1N 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. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Seo-yeon Takahashi Tape trading list upon request. SASE required for international mail. From jlee@demon.co.uk Thu Nov 07 02:01:49 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!demon!jlee From: jlee@demon.co.uk (Joachim Lee) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Nov07.020149.8449@demon.co.uk> Date: Thu, 07 Nov 1996 02:01:49 GMT References: <1996Nov06.021449.7783@utexas.edu> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1996Nov06.021449.7783@utexas.edu>, stakahashi@utexas.edu (Seo-yeon Takahashi) 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. If you are posting from AOL, please read RFC 1036 before posting again. -- Joachim Lee | jlee@demon.co.uk PGP Key fingerprint: F4F9 024C 44D4 69D5 "Keep the channels open." From kito@demon.co.uk Thu Nov 07 13:48:49 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!demon!kito From: kito@demon.co.uk (Kenji Ito) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Nov07.134849.1769@demon.co.uk> Date: Thu, 07 Nov 1996 13:48:49 GMT References: <1996Nov06.021449.7783@utexas.edu> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: Netscape 1.1N Lines: 8 In article <1996Nov06.021449.7783@utexas.edu>, stakahashi@utexas.edu (Seo-yeon Takahashi) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Kenji Ito -- Demon Internet Services UK "The hatch is open. Is anyone listening?" From jstewart@demon.co.uk Fri Nov 08 19:28:49 1996 Path: ashpoly!cascade!bigsur!demon!jstewart From: jstewart@demon.co.uk (Ji-woo Stewart) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Nov08.192849.8160@demon.co.uk> Date: Fri, 08 Nov 1996 19:28:49 GMT References: <1996Nov06.021449.7783@utexas.edu> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Nov06.021449.7783@utexas.edu>, stakahashi@utexas.edu (Seo-yeon Takahashi) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Ji-woo Stewart "They will send a copy in my place." Decstation 5000/200 / FreeBSD 2.1 From gsokolov@rwth-aachen.de Sat Nov 09 02:10:49 1996 Path: ashpoly!cascade!brgate!saturno!rwth-aachen!gsokolov From: gsokolov@rwth-aachen.de (Göran Sokolov) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Nov09.021049.8330@rwth-aachen.de> Date: Sat, 09 Nov 1996 02:10:49 GMT References: <1996Nov06.021449.7783@utexas.edu> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: Netscape 1.1N Lines: 11 In article <1996Nov06.021449.7783@utexas.edu>, stakahashi@utexas.edu (Seo-yeon Takahashi) 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! Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Göran Sokolov US Robotics Courier V.34 @ 19,200 bps "Do not worship the copy."