From flopez@cam.ac.uk Mon May 08 16:58:15 1995 Path: ashpoly!cascade!bigsur!cam!flopez From: flopez@cam.ac.uk (Freya López) Newsgroups: comp.sys.m68k Subject: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May08.165815.1605@cam.ac.uk> Date: Mon, 08 May 1995 16:58:15 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk 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. 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. Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- Freya López Hayes Optima 288 @ 28,800 bps "Do not worship the copy." From cmacdonald@demon.co.uk Wed May 10 10:16:15 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!demon!cmacdonald From: cmacdonald@demon.co.uk (Camila MacDonald) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May10.101615.2816@demon.co.uk> Date: Wed, 10 May 1995 10:16:15 GMT References: <1995May08.165815.1605@cam.ac.uk> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995May08.165815.1605@cam.ac.uk>, flopez@cam.ac.uk (Freya López) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- === Camila MacDonald === Dept of Electrical Engineering, Demon Internet Services UK "Hardware is temporary. The signal survives." From lvasiliev@purdue.edu Fri May 12 04:44:15 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!purdue!lvasiliev From: lvasiliev@purdue.edu (Lars Vasiliev) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May12.044415.6332@purdue.edu> Date: Fri, 12 May 1995 04:44:15 GMT References: <1995May08.165815.1605@cam.ac.uk> <1995May10.101615.2816@demon.co.uk> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995May10.101615.2816@demon.co.uk>, cmacdonald@demon.co.uk (Camila MacDonald) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Lars Vasiliev Opinions expressed are solely my own and not those of Purdue University Engineering Computer Network. ------------------------------------------------------------ From dcampbell@cam.ac.uk Sat May 13 13:42:15 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!cam!dcampbell From: dcampbell@cam.ac.uk (Dmitri Campbell) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May13.134215.8653@cam.ac.uk> Date: Sat, 13 May 1995 13:42:15 GMT References: <1995May08.165815.1605@cam.ac.uk> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995May08.165815.1605@cam.ac.uk>, flopez@cam.ac.uk (Freya López) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. > When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Dmitri Campbell "The carrier frequency does not drift by accident." Mac IIci / 68882 FPU / NEXTSTEP 3.3 From operez@berkeley.edu Sun May 14 18:06:15 1995 Path: ashpoly!cascade!bigsur!berkeley!operez From: operez@berkeley.edu (Olga Pérez) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May14.180615.2256@berkeley.edu> Date: Sun, 14 May 1995 18:06:15 GMT References: <1995May08.165815.1605@cam.ac.uk> <1995May10.101615.2816@demon.co.uk> <1995May12.044415.6332@purdue.edu> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995May12.044415.6332@purdue.edu>, lvasiliev@purdue.edu (Lars Vasiliev) writes: > Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- === Olga Pérez === Dept of Electrical Engineering, UC Berkeley Department of EECS "Marcus is not one man."