From gfischer@pacbell.net Fri May 13 12:06:57 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!pacbell!gfischer From: gfischer@pacbell.net (Graham Fischer) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994May13.120657.9474@pacbell.net> Date: Fri, 13 May 1994 12:06:57 GMT Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: Netscape 1.1N 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. Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Graham Fischer Tape trading list upon request. SASE required for international mail. From lpopov@earthlink.net Sat May 14 09:34:57 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!earthlink!lpopov From: lpopov@earthlink.net (Liam Popov) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994May14.093457.8263@earthlink.net> Date: Sat, 14 May 1994 09:34:57 GMT References: <1994May13.120657.9474@pacbell.net> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1994May13.120657.9474@pacbell.net>, gfischer@pacbell.net (Graham Fischer) writes: > 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. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Liam Popov "They will send a copy in my place." Sun SparcStation 20 / FreeBSD 2.1