From mwatanabe@demon.co.uk Sat Sep 28 11:46:12 1996 Path: ashpoly!cascade!bigsur!demon!mwatanabe From: mwatanabe@demon.co.uk (Marisol Watanabe) Newsgroups: comp.sys.m68k Subject: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Sep28.114612.2285@demon.co.uk> Date: Sat, 28 Sep 1996 11:46:12 GMT Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.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! Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- Marisol Watanabe Zyxel U-1496E @ 14,400 bps "They will send a copy in my place." From nmartinez@ox.ac.uk Sat Sep 28 13:14:12 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!ox!nmartinez From: nmartinez@ox.ac.uk (Natalia Martínez) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Sep28.131412.7573@ox.ac.uk> Date: Sat, 28 Sep 1996 13:14:12 GMT References: <1996Sep28.114612.2285@demon.co.uk> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Sep28.114612.2285@demon.co.uk>, mwatanabe@demon.co.uk (Marisol Watanabe) 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. -- === Natalia Martínez === Dept of Electrical Engineering, Oxford University Computing Laboratory "In theory there is no difference between theory and practice."