From klaurent@cam.ac.uk Tue May 17 10:44:32 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!cam!klaurent From: klaurent@cam.ac.uk (Karen Laurent) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994May17.104432.5682@cam.ac.uk> Date: Tue, 17 May 1994 10:44:32 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: Netscape 1.1N 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! -- Karen Laurent "Extraordinary claims require extraordinary spectra." Decstation 5000/200 / NEXTSTEP 3.3 From mmartinez@demon.co.uk Tue May 17 22:26:32 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!demon!mmartinez From: mmartinez@demon.co.uk (Mathieu Martínez) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994May17.222632.6397@demon.co.uk> Date: Tue, 17 May 1994 22:26:32 GMT References: <1994May17.104432.5682@cam.ac.uk> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: Netscape 1.1N Lines: 9 In article <1994May17.104432.5682@cam.ac.uk>, klaurent@cam.ac.uk (Karen Laurent) 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. -- Mathieu Martínez *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0