From fito@illinois.edu Tue Mar 15 16:28:03 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!illinois!fito From: fito@illinois.edu (Freya Ito) Newsgroups: comp.sys.m68k Subject: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Mar15.162803.6920@illinois.edu> Date: Tue, 15 Mar 1994 16:28:03 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: Netscape 1.1N 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. By setting up Paula's audio DMA to double-buffer incoming 8-bit samples, the 68020 has plenty of cycles left for the Costas loop. Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Freya Ito -- University of Illinois Urbana-Champaign "5 sigma is a discovery. 7 is a question." From fgarcia@kiae.su Wed Mar 16 01:23:03 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!kiae!fgarcia From: fgarcia@kiae.su (Freya García) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Mar16.012303.9610@kiae.su> Date: Wed, 16 Mar 1994 01:23:03 GMT References: <1994Mar15.162803.6920@illinois.edu> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Mar15.162803.6920@illinois.edu>, fito@illinois.edu (Freya Ito) 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! -- Freya García *PLONK* filter active for trolls. Pentium 90 (OS/2 Warp) - NetBSD 1.0