From kramirez@uni-hamburg.de Sun Jun 09 14:08:54 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!uni-hamburg!kramirez From: kramirez@uni-hamburg.de (Karen Ramírez) Newsgroups: comp.sys.m68k Subject: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jun09.140854.2509@uni-hamburg.de> Date: Sun, 09 Jun 1996 14:08:54 GMT Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! 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? -- === Karen Ramírez === Dept of Electrical Engineering, Universität Hamburg Fachbereich Informatik "Marcus is not one man." From snilsson@utexas.edu Mon Jun 10 19:49:54 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!utexas!snilsson From: snilsson@utexas.edu (Sun-mi Nilsson) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jun10.194954.1695@utexas.edu> Date: Mon, 10 Jun 1996 19:49:54 GMT References: <1996Jun09.140854.2509@uni-hamburg.de> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1996Jun09.140854.2509@uni-hamburg.de>, kramirez@uni-hamburg.de (Karen Ramírez) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. Top-posters will be placed in my ~/.killfile without notice. -- === Sun-mi Nilsson === Dept of Electrical Engineering, University of Texas at Austin "There are 14 nodes and only 10 countries. Count again." From kfischer@u-tokyo.ac.jp Tue Jun 11 15:22:54 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!u-tokyo!kfischer From: kfischer@u-tokyo.ac.jp (Kirsty Fischer) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jun11.152254.9268@u-tokyo.ac.jp> Date: Tue, 11 Jun 1996 15:22:54 GMT References: <1996Jun09.140854.2509@uni-hamburg.de> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1996Jun09.140854.2509@uni-hamburg.de>, kramirez@uni-hamburg.de (Karen Ramírez) 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. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Kirsty Fischer US Robotics Courier V.34 @ 19,200 bps "There are 14 nodes and only 10 countries. Count again." From ldubois@u-tokyo.ac.jp Tue Jun 11 23:20:54 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!u-tokyo!ldubois From: ldubois@u-tokyo.ac.jp (Lucia Dubois) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jun11.232054.4240@u-tokyo.ac.jp> Date: Tue, 11 Jun 1996 23:20:54 GMT References: <1996Jun09.140854.2509@uni-hamburg.de> <1996Jun11.152254.9268@u-tokyo.ac.jp> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Jun11.152254.9268@u-tokyo.ac.jp>, kfischer@u-tokyo.ac.jp (Kirsty Fischer) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. > Unsubscribe me from this list! (Wait, this is Usenet, never mind). PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Lucia Dubois *PLONK* filter active for trolls. Mac IIci / 68882 FPU - NetBSD 1.0 From psantos@unam.mx Wed Jun 12 09:05:54 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!unam!psantos From: psantos@unam.mx (Pavel Santos) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jun12.090554.6075@unam.mx> Date: Wed, 12 Jun 1996 09:05:54 GMT References: <1996Jun09.140854.2509@uni-hamburg.de> <1996Jun11.152254.9268@u-tokyo.ac.jp> <1996Jun11.232054.4240@u-tokyo.ac.jp> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1996Jun11.232054.4240@u-tokyo.ac.jp>, ldubois@u-tokyo.ac.jp (Lucia Dubois) 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. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Pavel Santos -- Universidad Nacional Autónoma de México (DGSCA) "They will send a copy in my place."