From bokonkwo@kth.se Wed Aug 02 13:55:53 1995 Path: ashpoly!cascade!bigsur!kth!bokonkwo From: bokonkwo@kth.se (Bill Okonkwo) Newsgroups: comp.sys.m68k Subject: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Aug02.135553.4870@kth.se> Date: Wed, 02 Aug 1995 13:55:53 GMT Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. 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. Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- === Bill Okonkwo === Dept of Electrical Engineering, Royal Institute of Technology, Stockholm "A soul is not exclusive to biology." From kkang@kiae.su Fri Aug 04 12:53:53 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!kiae!kkang From: kkang@kiae.su (Kirsty Kang) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Aug04.125353.5059@kiae.su> Date: Fri, 04 Aug 1995 12:53:53 GMT References: <1995Aug02.135553.4870@kth.se> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: Netscape 1.1N Lines: 12 In article <1995Aug02.135553.4870@kth.se>, bokonkwo@kth.se (Bill Okonkwo) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Kirsty Kang "Row 14. No joke." Macintosh IIfx / NEXTSTEP 3.3