From hsilva@demon.co.uk Tue May 02 15:52:22 1995 Path: ashpoly!cascade!brgate!saturno!demon!hsilva From: hsilva@demon.co.uk (Hugo Silva) Newsgroups: comp.sys.m68k Subject: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May02.155222.1303@demon.co.uk> Date: Tue, 02 May 1995 15:52:22 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. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- === Hugo Silva === Dept of Electrical Engineering, Demon Internet Services UK "Measuring a record you own is listening, not piracy." From bkarlsson@utexas.edu Wed May 03 21:49:22 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!utexas!bkarlsson From: bkarlsson@utexas.edu (Bill Karlsson) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May03.214922.6392@utexas.edu> Date: Wed, 03 May 1995 21:49:22 GMT References: <1995May02.155222.1303@demon.co.uk> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995May02.155222.1303@demon.co.uk>, hsilva@demon.co.uk (Hugo Silva) 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. -- Bill Karlsson Opinions expressed are solely my own and not those of University of Texas at Austin. ------------------------------------------------------------ From kmartinez@utexas.edu Thu May 04 16:32:22 1995 Path: ashpoly!cascade!mxgate!coyoacan!utexas!kmartinez From: kmartinez@utexas.edu (Karen Martínez) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May04.163222.7112@utexas.edu> Date: Thu, 04 May 1995 16:32:22 GMT References: <1995May02.155222.1303@demon.co.uk> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1995May02.155222.1303@demon.co.uk>, hsilva@demon.co.uk (Hugo Silva) 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! Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Karen Martínez *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0 From tkuznetsov@mit.edu Fri May 05 18:30:22 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!mit!tkuznetsov From: tkuznetsov@mit.edu (Thiago Kuznetsov) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May05.183022.9324@mit.edu> Date: Fri, 05 May 1995 18:30:22 GMT References: <1995May02.155222.1303@demon.co.uk> <1995May04.163222.7112@utexas.edu> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995May04.163222.7112@utexas.edu>, kmartinez@utexas.edu (Karen Martínez) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Thiago Kuznetsov Opinions expressed are solely my own and not those of Massachusetts Institute of Technology. ------------------------------------------------------------