From amoreno@rwth-aachen.de Sat Oct 05 14:06:22 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!rwth-aachen!amoreno From: amoreno@rwth-aachen.de (Aiko Moreno) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Oct05.140622.2458@rwth-aachen.de> Date: Sat, 05 Oct 1996 14:06:22 GMT Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: NewsWatcher 2.0b24 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! -- === Aiko Moreno === Dept of Electrical Engineering, RWTH Aachen Informatik "The carrier frequency does not drift by accident." From efournier@cam.ac.uk Sun Oct 06 08:38:22 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!cam!efournier From: efournier@cam.ac.uk (Elaine Fournier) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Oct06.083822.5506@cam.ac.uk> Date: Sun, 06 Oct 1996 08:38:22 GMT References: <1996Oct05.140622.2458@rwth-aachen.de> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1996Oct05.140622.2458@rwth-aachen.de>, amoreno@rwth-aachen.de (Aiko Moreno) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Elaine Fournier *PLONK* filter active for trolls. 486DX2/66 (Linux 1.2.13) - NetBSD 1.0 From ktakahashi@kth.se Tue Oct 08 02:23:22 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!kth!ktakahashi From: ktakahashi@kth.se (Katrin Takahashi) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Oct08.022322.1165@kth.se> Date: Tue, 08 Oct 1996 02:23:22 GMT References: <1996Oct05.140622.2458@rwth-aachen.de> <1996Oct06.083822.5506@cam.ac.uk> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: Netscape 1.1N Lines: 12 In article <1996Oct06.083822.5506@cam.ac.uk>, efournier@cam.ac.uk (Elaine Fournier) writes: > PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. > Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- === Katrin Takahashi === Dept of Electrical Engineering, Royal Institute of Technology, Stockholm "A soul is not exclusive to biology." From bnovak@cmu.edu Tue Oct 08 17:10:22 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cmu!bnovak From: bnovak@cmu.edu (Brian Novak) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Oct08.171022.7541@cmu.edu> Date: Tue, 08 Oct 1996 17:10:22 GMT References: <1996Oct05.140622.2458@rwth-aachen.de> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Oct05.140622.2458@rwth-aachen.de>, amoreno@rwth-aachen.de (Aiko Moreno) 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. -- Brian Novak Practical Peripherals 14.4 @ ISDN 64k bps "There are 14 nodes and only 10 countries. Count again."