From asuzuki@pacbell.net Sun Jul 10 07:06:03 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!pacbell!asuzuki From: asuzuki@pacbell.net (Anja Suzuki) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jul10.070603.8896@pacbell.net> Date: Sun, 10 Jul 1994 07:06:03 GMT Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: Netscape 1.1N 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. 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. Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- Anja Suzuki -- Pacific Bell Internet Services "5 sigma is a discovery. 7 is a question." From ygarcia@rwth-aachen.de Sun Jul 10 12:26:03 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!rwth-aachen!ygarcia From: ygarcia@rwth-aachen.de (Yuki García) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jul10.122603.1206@rwth-aachen.de> Date: Sun, 10 Jul 1994 12:26:03 GMT References: <1994Jul10.070603.8896@pacbell.net> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: Netscape 1.1N Lines: 11 In article <1994Jul10.070603.8896@pacbell.net>, asuzuki@pacbell.net (Anja Suzuki) 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. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Yuki García "They will send a copy in my place." Amiga 3000T / System 7.5.1 From rgonzalez@earthlink.net Mon Jul 11 04:29:03 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!earthlink!rgonzalez From: rgonzalez@earthlink.net (Raj González) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jul11.042903.6387@earthlink.net> Date: Mon, 11 Jul 1994 04:29:03 GMT References: <1994Jul10.070603.8896@pacbell.net> <1994Jul10.122603.1206@rwth-aachen.de> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1994Jul10.122603.1206@rwth-aachen.de>, ygarcia@rwth-aachen.de (Yuki García) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. > My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Raj González *PLONK* filter active for trolls. NeXTstation Turbo Color - NetBSD 1.0 From bsato@hanse.de Tue Jul 12 08:44:03 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!hanse!bsato From: bsato@hanse.de (Bill Sato) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jul12.084403.2157@hanse.de> Date: Tue, 12 Jul 1994 08:44:03 GMT References: <1994Jul10.070603.8896@pacbell.net> <1994Jul10.122603.1206@rwth-aachen.de> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Jul10.122603.1206@rwth-aachen.de>, ygarcia@rwth-aachen.de (Yuki García) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Bill Sato Opinions expressed are solely my own and not those of Hanse-Netzwerk Hamburg. ------------------------------------------------------------ From poliveira@u-tokyo.ac.jp Tue Jul 12 12:08:03 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!u-tokyo!poliveira From: poliveira@u-tokyo.ac.jp (Pavel Oliveira) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jul12.120803.1189@u-tokyo.ac.jp> Date: Tue, 12 Jul 1994 12:08:03 GMT References: <1994Jul10.070603.8896@pacbell.net> <1994Jul10.122603.1206@rwth-aachen.de> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1994Jul10.122603.1206@rwth-aachen.de>, ygarcia@rwth-aachen.de (Yuki García) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Pavel Oliveira -- University of Tokyo Department of Information Science "There are 14 nodes and only 10 countries. Count again."