From beriksson@hanse.de Sat Nov 05 02:03:06 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!hanse!beriksson From: beriksson@hanse.de (Bill Eriksson) Newsgroups: comp.sys.m68k Subject: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Nov05.020306.7431@hanse.de> Date: Sat, 05 Nov 1994 02:03:06 GMT Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. 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! -- Bill Eriksson Practical Peripherals 14.4 @ 33,600 bps "5 sigma is a discovery. 7 is a question." From ksouza@illinois.edu Sun Nov 06 12:27:06 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!illinois!ksouza From: ksouza@illinois.edu (Katrin Souza) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Nov06.122706.6824@illinois.edu> Date: Sun, 06 Nov 1994 12:27:06 GMT References: <1994Nov05.020306.7431@hanse.de> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Nov05.020306.7431@hanse.de>, beriksson@hanse.de (Bill Eriksson) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Katrin Souza *PLONK* filter active for trolls. Amiga 1200 (Blizzard 030/50) - NetBSD 1.0