From mpopov@kth.se Tue Apr 25 21:55:25 1995 Path: ashpoly!cascade!brgate!saturno!kth!mpopov From: mpopov@kth.se (Marisol Popov) Newsgroups: comp.sys.m68k Subject: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Apr25.215525.6875@kth.se> Date: Tue, 25 Apr 1995 21:55:25 GMT Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se 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. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! By setting up Paula's audio DMA to double-buffer incoming 8-bit samples, the 68020 has plenty of cycles left for the Costas loop. Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Marisol Popov -- Royal Institute of Technology, Stockholm "The carrier frequency does not drift by accident." From loliveira@cam.ac.uk Wed Apr 26 21:47:25 1995 Path: ashpoly!cascade!mxgate!coyoacan!cam!loliveira From: loliveira@cam.ac.uk (Liam Oliveira) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Apr26.214725.2020@cam.ac.uk> Date: Wed, 26 Apr 1995 21:47:25 GMT References: <1995Apr25.215525.6875@kth.se> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1995Apr25.215525.6875@kth.se>, mpopov@kth.se (Marisol Popov) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. > When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! 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. -- Liam Oliveira *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0 From fsato@unam.mx Fri Apr 28 20:29:25 1995 Path: ashpoly!cascade!brgate!saturno!unam!fsato From: fsato@unam.mx (Fiona Sato) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Apr28.202925.2502@unam.mx> Date: Fri, 28 Apr 1995 20:29:25 GMT References: <1995Apr25.215525.6875@kth.se> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Apr25.215525.6875@kth.se>, mpopov@kth.se (Marisol Popov) 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! -- === Fiona Sato === Dept of Electrical Engineering, Universidad Nacional Autónoma de México (DGSCA) "There are 14 nodes and only 10 countries. Count again." From tsato@kiae.su Sun Apr 30 21:33:25 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!kiae!tsato From: tsato@kiae.su (Tyler Sato) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Apr30.213325.9607@kiae.su> Date: Sun, 30 Apr 1995 21:33:25 GMT References: <1995Apr25.215525.6875@kth.se> <1995Apr28.202925.2502@unam.mx> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Apr28.202925.2502@unam.mx>, fsato@unam.mx (Fiona Sato) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Tyler Sato *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0 From pvasiliev@delphi.com Mon May 01 01:40:25 1995 Path: ashpoly!cascade!brgate!saturno!delphi!pvasiliev From: pvasiliev@delphi.com (Pavel Vasiliev) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May01.014025.4830@delphi.com> Date: Mon, 01 May 1995 01:40:25 GMT References: <1995Apr25.215525.6875@kth.se> <1995Apr28.202925.2502@unam.mx> <1995Apr30.213325.9607@kiae.su> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1995Apr30.213325.9607@kiae.su>, tsato@kiae.su (Tyler Sato) writes: > Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Pavel Vasiliev Tape trading list upon request. SASE required for international mail.