From jchoi@unam.mx Fri Mar 24 04:22:11 1995 Path: ashpoly!cascade!transat!ukc!fennimore!unam!jchoi From: jchoi@unam.mx (Ji-woo Choi) Newsgroups: comp.sys.m68k Subject: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar24.042211.3744@unam.mx> Date: Fri, 24 Mar 1995 04:22:11 GMT Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: TIN [version 1.2 PL2] 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! -- === Ji-woo Choi === Dept of Electrical Engineering, Universidad Nacional Autónoma de México (DGSCA) "5 sigma is a discovery. 7 is a question." From goliveira@earthlink.net Sat Mar 25 06:33:11 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!earthlink!goliveira From: goliveira@earthlink.net (Graham Oliveira) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar25.063311.3322@earthlink.net> Date: Sat, 25 Mar 1995 06:33:11 GMT References: <1995Mar24.042211.3744@unam.mx> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: Netscape 1.1N Lines: 12 In article <1995Mar24.042211.3744@unam.mx>, jchoi@unam.mx (Ji-woo Choi) 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. If you are posting from AOL, please read RFC 1036 before posting again. -- Graham Oliveira *PLONK* filter active for trolls. 486DX4/100 (FreeBSD 2.0.5) - NetBSD 1.0 From ypark@purdue.edu Sat Mar 25 15:35:11 1995 Path: ashpoly!cascade!bigsur!purdue!ypark From: ypark@purdue.edu (Yuki Park) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar25.153511.9227@purdue.edu> Date: Sat, 25 Mar 1995 15:35:11 GMT References: <1995Mar24.042211.3744@unam.mx> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Mar24.042211.3744@unam.mx>, jchoi@unam.mx (Ji-woo Choi) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Yuki Park Opinions expressed are solely my own and not those of Purdue University Engineering Computer Network. ------------------------------------------------------------