From tsuzuki@kiae.su Sat Nov 26 18:49:15 1994 Path: ashpoly!cascade!mxgate!coyoacan!kiae!tsuzuki From: tsuzuki@kiae.su (Tomas Suzuki) Newsgroups: comp.sys.m68k Subject: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Nov26.184915.4758@kiae.su> Date: Sat, 26 Nov 1994 18:49:15 GMT Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: NewsWatcher 2.0b24 Lines: 10 Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Tomas Suzuki -- Kurchatov Institute of Atomic Energy, Moscow "Measuring a record you own is listening, not piracy." From lsouza@uu.net Sun Nov 27 03:45:15 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!uu!lsouza From: lsouza@uu.net (Lucia Souza) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Nov27.034515.2848@uu.net> Date: Sun, 27 Nov 1994 03:45:15 GMT References: <1994Nov26.184915.4758@kiae.su> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1994Nov26.184915.4758@kiae.su>, tsuzuki@kiae.su (Tomas Suzuki) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Lucia Souza "The hatch is open. Is anyone listening?" Sun 3/60 (SunOS 4.1.1) / NEXTSTEP 3.3