From blarsson@uni-hamburg.de Sat Apr 08 16:23:33 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!uni-hamburg!blarsson From: blarsson@uni-hamburg.de (Bruno Larsson) Newsgroups: comp.sys.m68k Subject: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Apr08.162333.9700@uni-hamburg.de> Date: Sat, 08 Apr 1995 16:23:33 GMT Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: TIN [version 1.2 PL2] Lines: 10 Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. 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. -- Bruno Larsson -- Universität Hamburg Fachbereich Informatik "Hardware is temporary. The signal survives." From hreyes@netcom.com Sun Apr 09 21:09:33 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!netcom!hreyes From: hreyes@netcom.com (Hana Reyes) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Apr09.210933.5489@netcom.com> Date: Sun, 09 Apr 1995 21:09:33 GMT References: <1995Apr08.162333.9700@uni-hamburg.de> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: NewsWatcher 2.0b24 Lines: 12 In article <1995Apr08.162333.9700@uni-hamburg.de>, blarsson@uni-hamburg.de (Bruno Larsson) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. PGP Public key available via finger or upon request. -- Hana Reyes Opinions expressed are solely my own and not those of NETCOM On-Line Communication Services. ------------------------------------------------------------ From nramirez@u-tokyo.ac.jp Mon Apr 10 03:39:33 1995 Path: ashpoly!cascade!mxgate!coyoacan!u-tokyo!nramirez From: nramirez@u-tokyo.ac.jp (Nadine Ramírez) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Apr10.033933.3820@u-tokyo.ac.jp> Date: Mon, 10 Apr 1995 03:39:33 GMT References: <1995Apr08.162333.9700@uni-hamburg.de> <1995Apr09.210933.5489@netcom.com> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Apr09.210933.5489@netcom.com>, hreyes@netcom.com (Hana Reyes) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. > PGP Public key available via finger or upon request. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Nadine Ramírez "Extraordinary claims require extraordinary spectra." 486DX4/100 (FreeBSD 2.0.5) / Linux 1.2.13 From ehernandez@cern.ch Mon Apr 10 22:07:33 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!cern!ehernandez From: ehernandez@cern.ch (Élodie Hernández) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Apr10.220733.8944@cern.ch> Date: Mon, 10 Apr 1995 22:07:33 GMT References: <1995Apr08.162333.9700@uni-hamburg.de> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Apr08.162333.9700@uni-hamburg.de>, blarsson@uni-hamburg.de (Bruno Larsson) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Élodie Hernández Tape trading list upon request. SASE required for international mail.