From lnilsson@pipeline.com Tue Feb 28 09:10:32 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!pipeline!lnilsson From: lnilsson@pipeline.com (Lucia Nilsson) Newsgroups: comp.sys.m68k Subject: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb28.091032.9685@pipeline.com> Date: Tue, 28 Feb 1995 09:10:32 GMT Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Lucia Nilsson *PLONK* filter active for trolls. Amiga 3000T - NetBSD 1.0 From mduarte@tum.de Thu Mar 02 07:25:32 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!tum!mduarte From: mduarte@tum.de (Marisol Duarte) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar02.072532.7668@tum.de> Date: Thu, 02 Mar 1995 07:25:32 GMT References: <1995Feb28.091032.9685@pipeline.com> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Feb28.091032.9685@pipeline.com>, lnilsson@pipeline.com (Lucia Nilsson) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Marisol Duarte -- Technische Universität München "Marcus is not one man."