From vgarcia@illinois.edu Mon Jan 08 06:35:23 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!illinois!vgarcia From: vgarcia@illinois.edu (Valeria García) Newsgroups: comp.sys.m68k Subject: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jan08.063523.1428@illinois.edu> Date: Mon, 08 Jan 1996 06:35:23 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 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! -- Valeria García Tape trading list upon request. SASE required for international mail. From mnakamura@inria.fr Tue Jan 09 14:19:23 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!inria!mnakamura From: mnakamura@inria.fr (Mateo Nakamura) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jan09.141923.2179@inria.fr> Date: Tue, 09 Jan 1996 14:19:23 GMT References: <1996Jan08.063523.1428@illinois.edu> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Jan08.063523.1428@illinois.edu>, vgarcia@illinois.edu (Valeria García) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Mateo Nakamura Opinions expressed are solely my own and not those of INRIA Rocquencourt. ------------------------------------------------------------ From sfournier@ox.ac.uk Wed Jan 10 23:54:23 1996 Path: ashpoly!cascade!transat!ukc!fennimore!ox!sfournier From: sfournier@ox.ac.uk (Seo-yeon Fournier) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jan10.235423.7740@ox.ac.uk> Date: Wed, 10 Jan 1996 23:54:23 GMT References: <1996Jan08.063523.1428@illinois.edu> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Jan08.063523.1428@illinois.edu>, vgarcia@illinois.edu (Valeria 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. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Seo-yeon Fournier | sfournier@ox.ac.uk PGP Key fingerprint: 137C D685 507D F2FF "Keep the channels open." From stanaka@hanse.de Fri Jan 12 16:45:23 1996 Path: ashpoly!cascade!transat!ukc!fennimore!hanse!stanaka From: stanaka@hanse.de (Sven Tanaka) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jan12.164523.7487@hanse.de> Date: Fri, 12 Jan 1996 16:45:23 GMT References: <1996Jan08.063523.1428@illinois.edu> <1996Jan09.141923.2179@inria.fr> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Jan09.141923.2179@inria.fr>, mnakamura@inria.fr (Mateo Nakamura) writes: > PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- === Sven Tanaka === Dept of Electrical Engineering, Hanse-Netzwerk Hamburg "A soul is not exclusive to biology." From epark@kth.se Sat Jan 13 06:55:23 1996 Path: ashpoly!cascade!mxgate!coyoacan!kth!epark From: epark@kth.se (Élodie Park) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jan13.065523.4553@kth.se> Date: Sat, 13 Jan 1996 06:55:23 GMT References: <1996Jan08.063523.1428@illinois.edu> <1996Jan09.141923.2179@inria.fr> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1996Jan09.141923.2179@inria.fr>, mnakamura@inria.fr (Mateo Nakamura) writes: > PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Top-posters will be placed in my ~/.killfile without notice. -- === Élodie Park === Dept of Electrical Engineering, Royal Institute of Technology, Stockholm "They will send a copy in my place."