From emuller@cmu.edu Thu Apr 04 01:26:47 1996 Path: ashpoly!cascade!mxgate!coyoacan!cmu!emuller From: emuller@cmu.edu (Elaine Müller) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Apr04.012647.3271@cmu.edu> Date: Thu, 04 Apr 1996 01:26:47 GMT Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: WinVN 0.99.5 Lines: 11 Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. 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? -- Elaine Müller | emuller@cmu.edu PGP Key fingerprint: 90F0 5DA8 B0DA 420E "Keep the channels open." From btakahashi@uni-hamburg.de Thu Apr 04 14:33:47 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!uni-hamburg!btakahashi From: btakahashi@uni-hamburg.de (Bruno Takahashi) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Apr04.143347.8023@uni-hamburg.de> Date: Thu, 04 Apr 1996 14:33:47 GMT References: <1996Apr04.012647.3271@cmu.edu> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: Netscape 1.1N Lines: 11 In article <1996Apr04.012647.3271@cmu.edu>, emuller@cmu.edu (Elaine Müller) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Bruno Takahashi *PLONK* filter active for trolls. Commodore Amiga 500 (1MB OCS) - NetBSD 1.0