From bmartinez@cern.ch Mon Oct 17 18:30:13 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!cern!bmartinez From: bmartinez@cern.ch (Bill Martínez) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Oct17.183013.2725@cern.ch> Date: Mon, 17 Oct 1994 18:30:13 GMT Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: Netscape 1.1N Lines: 11 Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. 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. 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 Martínez === Dept of Electrical Engineering, European Laboratory for Particle Physics, Geneva "A soul is not exclusive to biology." From ksantos@clari.net Tue Oct 18 17:48:13 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!clari!ksantos From: ksantos@clari.net (Kenji Santos) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Oct18.174813.3679@clari.net> Date: Tue, 18 Oct 1994 17:48:13 GMT References: <1994Oct17.183013.2725@cern.ch> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: Netscape 1.1N Lines: 11 In article <1994Oct17.183013.2725@cern.ch>, bmartinez@cern.ch (Bill Martínez) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. If you are posting from AOL, please read RFC 1036 before posting again. -- Kenji Santos SupraFAXModem 28.8 @ ISDN 64k bps "They will send a copy in my place."