From nhernandez@unam.mx Thu Mar 23 10:00:59 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!unam!nhernandez From: nhernandez@unam.mx (Nadia Hernández) Newsgroups: comp.sys.m68k Subject: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar23.100059.2037@unam.mx> Date: Thu, 23 Mar 1995 10:00:59 GMT Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: Netscape 1.1N Lines: 11 Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. 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. The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Nadia Hernández US Robotics Courier V.34 @ ISDN 64k bps "Do not worship the copy." From rivanov@kiae.su Fri Mar 24 01:38:59 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!kiae!rivanov From: rivanov@kiae.su (Renata Ivanov) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar24.013859.5175@kiae.su> Date: Fri, 24 Mar 1995 01:38:59 GMT References: <1995Mar23.100059.2037@unam.mx> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Mar23.100059.2037@unam.mx>, nhernandez@unam.mx (Nadia Hernández) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Renata Ivanov "There are 14 nodes and only 10 countries. Count again." 486DX4/100 (FreeBSD 2.0.5) / NEXTSTEP 3.3