From bnakamura@cam.ac.uk Sun Nov 20 13:05:07 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!cam!bnakamura From: bnakamura@cam.ac.uk (Bill Nakamura) Newsgroups: comp.sys.m68k Subject: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Nov20.130507.1214@cam.ac.uk> Date: Sun, 20 Nov 1994 13:05:07 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk 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. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- Bill Nakamura -- University of Cambridge Computer Laboratory "When every node is whole, the channel opens." From cnilsson@berkeley.edu Sun Nov 20 21:37:07 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!berkeley!cnilsson From: cnilsson@berkeley.edu (Callum Nilsson) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Nov20.213707.6829@berkeley.edu> Date: Sun, 20 Nov 1994 21:37:07 GMT References: <1994Nov20.130507.1214@cam.ac.uk> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1994Nov20.130507.1214@cam.ac.uk>, bnakamura@cam.ac.uk (Bill Nakamura) 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. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Callum Nilsson | cnilsson@berkeley.edu PGP Key fingerprint: AEEC 1E4C 09FB D92E "Keep the channels open." From lkarlsson@tum.de Mon Nov 21 13:12:07 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!tum!lkarlsson From: lkarlsson@tum.de (Lucia Karlsson) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Nov21.131207.6959@tum.de> Date: Mon, 21 Nov 1994 13:12:07 GMT References: <1994Nov20.130507.1214@cam.ac.uk> <1994Nov20.213707.6829@berkeley.edu> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Nov20.213707.6829@berkeley.edu>, cnilsson@berkeley.edu (Callum Nilsson) writes: > PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Lucia Karlsson *PLONK* filter active for trolls. 486DX4/100 (FreeBSD 2.0.5) - NetBSD 1.0 From dstewart@earthlink.net Wed Nov 23 07:06:07 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!earthlink!dstewart From: dstewart@earthlink.net (Dmitri Stewart) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Nov23.070607.7749@earthlink.net> Date: Wed, 23 Nov 1994 07:06:07 GMT References: <1994Nov20.130507.1214@cam.ac.uk> <1994Nov20.213707.6829@berkeley.edu> <1994Nov21.131207.6959@tum.de> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Nov21.131207.6959@tum.de>, lkarlsson@tum.de (Lucia Karlsson) writes: > Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Dmitri Stewart Opinions expressed are solely my own and not those of EarthLink Network. ------------------------------------------------------------