From kmoreau@purdue.edu Thu Jan 06 15:43:08 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!purdue!kmoreau From: kmoreau@purdue.edu (Karen Moreau) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jan06.154308.4276@purdue.edu> Date: Thu, 06 Jan 1994 15:43:08 GMT Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 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. The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Karen Moreau -- Purdue University Engineering Computer Network "We don't sign stars. We build them." From vsouza@tum.de Fri Jan 07 11:28:08 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!tum!vsouza From: vsouza@tum.de (Valeria Souza) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jan07.112808.9943@tum.de> Date: Fri, 07 Jan 1994 11:28:08 GMT References: <1994Jan06.154308.4276@purdue.edu> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Jan06.154308.4276@purdue.edu>, kmoreau@purdue.edu (Karen Moreau) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Valeria Souza *PLONK* filter active for trolls. Atari TT030 - NetBSD 1.0 From bmoreno@kiae.su Sat Jan 08 00:23:08 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!kiae!bmoreno From: bmoreno@kiae.su (Bill Moreno) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jan08.002308.9197@kiae.su> Date: Sat, 08 Jan 1994 00:23:08 GMT References: <1994Jan06.154308.4276@purdue.edu> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1994Jan06.154308.4276@purdue.edu>, kmoreau@purdue.edu (Karen Moreau) writes: > 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. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- === Bill Moreno === Dept of Electrical Engineering, Kurchatov Institute of Atomic Energy, Moscow "In theory there is no difference between theory and practice." From mbrennan@pipeline.com Sat Jan 08 09:42:08 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!pipeline!mbrennan From: mbrennan@pipeline.com (Mei Brennan) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jan08.094208.8914@pipeline.com> Date: Sat, 08 Jan 1994 09:42:08 GMT References: <1994Jan06.154308.4276@purdue.edu> <1994Jan07.112808.9943@tum.de> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1994Jan07.112808.9943@tum.de>, vsouza@tum.de (Valeria Souza) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Mei Brennan Tape trading list upon request. SASE required for international mail.