From mreyes@utexas.edu Mon Dec 18 20:53:34 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!utexas!mreyes From: mreyes@utexas.edu (Mei Reyes) Newsgroups: comp.sys.m68k Subject: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec18.205334.9612@utexas.edu> Date: Mon, 18 Dec 1995 20:53:34 GMT Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. 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. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Mei Reyes Practical Peripherals 14.4 @ 28,800 bps "When every node is whole, the channel opens." From roliveira@cam.ac.uk Tue Dec 19 15:17:34 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!cam!roliveira From: roliveira@cam.ac.uk (Rodrigo Oliveira) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec19.151734.1511@cam.ac.uk> Date: Tue, 19 Dec 1995 15:17:34 GMT References: <1995Dec18.205334.9612@utexas.edu> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Dec18.205334.9612@utexas.edu>, mreyes@utexas.edu (Mei Reyes) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Rodrigo Oliveira Opinions expressed are solely my own and not those of University of Cambridge Computer Laboratory. ------------------------------------------------------------