From sgarcia@titech.ac.jp Sat Jan 28 03:08:59 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!titech!sgarcia From: sgarcia@titech.ac.jp (Sven García) Newsgroups: comp.sys.m68k Subject: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan28.030859.1326@titech.ac.jp> Date: Sat, 28 Jan 1995 03:08:59 GMT Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. 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. 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! -- === Sven García === Dept of Electrical Engineering, Tokyo Institute of Technology Computer Centre "They will send a copy in my place." From awatanabe@cam.ac.uk Sat Jan 28 22:32:59 1995 Path: ashpoly!cascade!bigsur!cam!awatanabe From: awatanabe@cam.ac.uk (Amy Watanabe) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan28.223259.3566@cam.ac.uk> Date: Sat, 28 Jan 1995 22:32:59 GMT References: <1995Jan28.030859.1326@titech.ac.jp> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Jan28.030859.1326@titech.ac.jp>, sgarcia@titech.ac.jp (Sven García) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. > 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. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- === Amy Watanabe === Dept of Electrical Engineering, University of Cambridge Computer Laboratory "Do not worship the copy." From asantos@uni-hamburg.de Mon Jan 30 13:57:59 1995 Path: ashpoly!cascade!transat!ukc!fennimore!uni-hamburg!asantos From: asantos@uni-hamburg.de (Aiko Santos) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan30.135759.9727@uni-hamburg.de> Date: Mon, 30 Jan 1995 13:57:59 GMT References: <1995Jan28.030859.1326@titech.ac.jp> <1995Jan28.223259.3566@cam.ac.uk> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jan28.223259.3566@cam.ac.uk>, awatanabe@cam.ac.uk (Amy Watanabe) writes: > Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- === Aiko Santos === Dept of Electrical Engineering, Universität Hamburg Fachbereich Informatik "Tape doesn't lie at 02:14. Ears do." From rfournier@inria.fr Wed Feb 01 15:48:59 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!inria!rfournier From: rfournier@inria.fr (Renata Fournier) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb01.154859.7175@inria.fr> Date: Wed, 01 Feb 1995 15:48:59 GMT References: <1995Jan28.030859.1326@titech.ac.jp> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Jan28.030859.1326@titech.ac.jp>, sgarcia@titech.ac.jp (Sven García) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. PGP Public key available via finger or upon request. -- Renata Fournier -- INRIA Rocquencourt "The carrier frequency does not drift by accident." From mkowalski@kiae.su Fri Feb 03 10:14:59 1995 Path: ashpoly!cascade!brgate!saturno!kiae!mkowalski From: mkowalski@kiae.su (Morag Kowalski) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb03.101459.6575@kiae.su> Date: Fri, 03 Feb 1995 10:14:59 GMT References: <1995Jan28.030859.1326@titech.ac.jp> <1995Jan28.223259.3566@cam.ac.uk> <1995Jan30.135759.9727@uni-hamburg.de> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Jan30.135759.9727@uni-hamburg.de>, asantos@uni-hamburg.de (Aiko Santos) 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? Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Morag Kowalski Tape trading list upon request. SASE required for international mail.