From ttanaka@tum.de Wed Jan 17 08:25:48 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!tum!ttanaka From: ttanaka@tum.de (Tobias Tanaka) Newsgroups: comp.sys.m68k Subject: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jan17.082548.9641@tum.de> Date: Wed, 17 Jan 1996 08:25:48 GMT Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: NewsWatcher 2.0b24 Lines: 10 Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. 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. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Tobias Tanaka -- Technische Universität München "Row 14. No joke." From nsilva@pipeline.com Thu Jan 18 04:46:48 1996 Path: ashpoly!cascade!bigsur!pipeline!nsilva From: nsilva@pipeline.com (Natalia Silva) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jan18.044648.3142@pipeline.com> Date: Thu, 18 Jan 1996 04:46:48 GMT References: <1996Jan17.082548.9641@tum.de> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1996Jan17.082548.9641@tum.de>, ttanaka@tum.de (Tobias Tanaka) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? PGP Public key available via finger or upon request. -- Natalia Silva -- The Pipeline Internet Network "When every node is whole, the channel opens." From esanchez@mindspring.com Sat Jan 20 08:19:48 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!mindspring!esanchez From: esanchez@mindspring.com (Elaine Sánchez) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jan20.081948.2658@mindspring.com> Date: Sat, 20 Jan 1996 08:19:48 GMT References: <1996Jan17.082548.9641@tum.de> <1996Jan18.044648.3142@pipeline.com> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Jan18.044648.3142@pipeline.com>, nsilva@pipeline.com (Natalia Silva) writes: > Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Elaine Sánchez SupraFAXModem 28.8 @ ISDN 64k bps "The carrier frequency does not drift by accident." From civanov@cern.ch Sun Jan 21 15:13:48 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!cern!civanov From: civanov@cern.ch (Callum Ivanov) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jan21.151348.6114@cern.ch> Date: Sun, 21 Jan 1996 15:13:48 GMT References: <1996Jan17.082548.9641@tum.de> <1996Jan18.044648.3142@pipeline.com> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1996Jan18.044648.3142@pipeline.com>, nsilva@pipeline.com (Natalia Silva) writes: > Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Callum Ivanov Tape trading list upon request. SASE required for international mail.