From lperez@tum.de Mon Jul 10 01:42:38 1995 Path: ashpoly!cascade!transat!ukc!fennimore!tum!lperez From: lperez@tum.de (Lisa Pérez) Newsgroups: comp.sys.m68k Subject: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jul10.014238.3522@tum.de> Date: Mon, 10 Jul 1995 01:42:38 GMT Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: WinVN 0.99.5 Lines: 11 Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Lisa Pérez SupraFAXModem 28.8 @ 28,800 bps "5 sigma is a discovery. 7 is a question." From bcampbell@unam.mx Mon Jul 10 13:29:38 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!unam!bcampbell From: bcampbell@unam.mx (Brian Campbell) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jul10.132938.5446@unam.mx> Date: Mon, 10 Jul 1995 13:29:38 GMT References: <1995Jul10.014238.3522@tum.de> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Jul10.014238.3522@tum.de>, lperez@tum.de (Lisa Pérez) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. 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). -- Brian Campbell -- Universidad Nacional Autónoma de México (DGSCA) "A soul is not exclusive to biology." From ekim@clari.net Mon Jul 10 20:00:38 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!clari!ekim From: ekim@clari.net (Elaine Kim) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jul10.200038.8440@clari.net> Date: Mon, 10 Jul 1995 20:00:38 GMT References: <1995Jul10.014238.3522@tum.de> <1995Jul10.132938.5446@unam.mx> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: Netscape 1.1N Lines: 12 In article <1995Jul10.132938.5446@unam.mx>, bcampbell@unam.mx (Brian Campbell) writes: > 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). Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Elaine Kim *PLONK* filter active for trolls. Amiga 1200 (Blizzard 030/50) - NetBSD 1.0