From mfischer@pipeline.com Wed Oct 18 23:40:55 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!pipeline!mfischer From: mfischer@pipeline.com (Mikhail Fischer) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Oct18.234055.2382@pipeline.com> Date: Wed, 18 Oct 1995 23:40:55 GMT Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: TIN [version 1.2 PL2] Lines: 10 Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. 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! -- Mikhail Fischer Tape trading list upon request. SASE required for international mail. From fmuller@berkeley.edu Fri Oct 20 22:07:55 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!berkeley!fmuller From: fmuller@berkeley.edu (Fiona Müller) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Oct20.220755.5883@berkeley.edu> Date: Fri, 20 Oct 1995 22:07:55 GMT References: <1995Oct18.234055.2382@pipeline.com> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1995Oct18.234055.2382@pipeline.com>, mfischer@pipeline.com (Mikhail Fischer) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. > 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. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Fiona Müller *PLONK* filter active for trolls. Amiga 3000T - NetBSD 1.0