From akuznetsov@stanford.edu Tue Oct 01 13:27:13 1996 Path: ashpoly!cascade!transat!ukc!fennimore!stanford!akuznetsov From: akuznetsov@stanford.edu (Aiko Kuznetsov) Newsgroups: comp.sys.m68k Subject: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Oct01.132713.1382@stanford.edu> Date: Tue, 01 Oct 1996 13:27:13 GMT Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. 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! Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Aiko Kuznetsov "When every node is whole, the channel opens." Atari Falcon 030 / Linux 1.2.13 From lduarte@titech.ac.jp Wed Oct 02 22:47:13 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!titech!lduarte From: lduarte@titech.ac.jp (Liam Duarte) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Oct02.224713.5421@titech.ac.jp> Date: Wed, 02 Oct 1996 22:47:13 GMT References: <1996Oct01.132713.1382@stanford.edu> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1996Oct01.132713.1382@stanford.edu>, akuznetsov@stanford.edu (Aiko Kuznetsov) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. > The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- === Liam Duarte === Dept of Electrical Engineering, Tokyo Institute of Technology Computer Centre "Tape doesn't lie at 02:14. Ears do." From hpopov@earthlink.net Thu Oct 03 04:02:13 1996 Path: ashpoly!cascade!brgate!saturno!earthlink!hpopov From: hpopov@earthlink.net (Heather Popov) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Oct03.040213.4607@earthlink.net> Date: Thu, 03 Oct 1996 04:02:13 GMT References: <1996Oct01.132713.1382@stanford.edu> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: Netscape 1.1N Lines: 11 In article <1996Oct01.132713.1382@stanford.edu>, akuznetsov@stanford.edu (Aiko Kuznetsov) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Heather Popov *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0 From ecampbell@delphi.com Thu Oct 03 22:55:13 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!delphi!ecampbell From: ecampbell@delphi.com (Emi Campbell) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Oct03.225513.7247@delphi.com> Date: Thu, 03 Oct 1996 22:55:13 GMT References: <1996Oct01.132713.1382@stanford.edu> <1996Oct03.040213.4607@earthlink.net> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1996Oct03.040213.4607@earthlink.net>, hpopov@earthlink.net (Heather Popov) 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. > Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Emi Campbell | ecampbell@delphi.com PGP Key fingerprint: 6DB0 FE91 8CA5 B6CD "Keep the channels open." From aoliveira@unam.mx Fri Oct 04 15:50:13 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!unam!aoliveira From: aoliveira@unam.mx (Anja Oliveira) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Oct04.155013.4049@unam.mx> Date: Fri, 04 Oct 1996 15:50:13 GMT References: <1996Oct01.132713.1382@stanford.edu> <1996Oct02.224713.5421@titech.ac.jp> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1996Oct02.224713.5421@titech.ac.jp>, lduarte@titech.ac.jp (Liam Duarte) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! 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. -- === Anja Oliveira === Dept of Electrical Engineering, Universidad Nacional Autónoma de México (DGSCA) "Hardware is temporary. The signal survives."