From akowalski@clari.net Sat Apr 06 03:53:47 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!clari!akowalski From: akowalski@clari.net (Aiko Kowalski) Newsgroups: comp.sys.m68k Subject: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Apr06.035347.5862@clari.net> Date: Sat, 06 Apr 1996 03:53:47 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net 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. 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! Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Aiko Kowalski Zyxel U-1496E @ 9600 Telebit bps "Hold for relay." From gnilsson@cmu.edu Mon Apr 08 07:27:47 1996 Path: ashpoly!cascade!bigsur!cmu!gnilsson From: gnilsson@cmu.edu (Göran Nilsson) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Apr08.072747.9575@cmu.edu> Date: Mon, 08 Apr 1996 07:27:47 GMT References: <1996Apr06.035347.5862@clari.net> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Apr06.035347.5862@clari.net>, akowalski@clari.net (Aiko Kowalski) 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? -- === Göran Nilsson === Dept of Electrical Engineering, Carnegie Mellon University School of CS "Tape doesn't lie at 02:14. Ears do." From krobertson@inria.fr Tue Apr 09 20:18:47 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!inria!krobertson From: krobertson@inria.fr (Kenji Robertson) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Apr09.201847.4880@inria.fr> Date: Tue, 09 Apr 1996 20:18:47 GMT References: <1996Apr06.035347.5862@clari.net> <1996Apr08.072747.9575@cmu.edu> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Apr08.072747.9575@cmu.edu>, gnilsson@cmu.edu (Göran Nilsson) writes: > Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- === Kenji Robertson === Dept of Electrical Engineering, INRIA Rocquencourt "We don't sign stars. We build them."