From btakahashi@tum.de Thu Dec 28 04:48:54 1995 Path: ashpoly!cascade!bigsur!tum!btakahashi From: btakahashi@tum.de (Bastien Takahashi) Newsgroups: comp.sys.m68k Subject: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec28.044854.6914@tum.de> Date: Thu, 28 Dec 1995 04:48:54 GMT Organization: Technische Universität München NNTP-Posting-Host: tum.de 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. 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? -- Bastien Takahashi *PLONK* filter active for trolls. Amiga 3000T - NetBSD 1.0 From jandersson@mindspring.com Thu Dec 28 18:15:54 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!mindspring!jandersson From: jandersson@mindspring.com (Julien Andersson) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec28.181554.7747@mindspring.com> Date: Thu, 28 Dec 1995 18:15:54 GMT References: <1995Dec28.044854.6914@tum.de> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Dec28.044854.6914@tum.de>, btakahashi@tum.de (Bastien Takahashi) 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. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Julien Andersson *PLONK* filter active for trolls. Mac IIci / 68882 FPU - NetBSD 1.0