From mperez@purdue.edu Wed Nov 08 19:16:24 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!purdue!mperez From: mperez@purdue.edu (Min-jun Pérez) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Nov08.191624.6836@purdue.edu> Date: Wed, 08 Nov 1995 19:16:24 GMT Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu 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! Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Min-jun Pérez -- Purdue University Engineering Computer Network "There are 14 nodes and only 10 countries. Count again." From mmoreno@illinois.edu Thu Nov 09 03:14:24 1995 Path: ashpoly!cascade!mxgate!coyoacan!illinois!mmoreno From: mmoreno@illinois.edu (Mei Moreno) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Nov09.031424.2205@illinois.edu> Date: Thu, 09 Nov 1995 03:14:24 GMT References: <1995Nov08.191624.6836@purdue.edu> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Nov08.191624.6836@purdue.edu>, mperez@purdue.edu (Min-jun Pérez) 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. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Mei Moreno -- University of Illinois Urbana-Champaign "The hatch is open. Is anyone listening?" From cgonzalez@uni-hamburg.de Thu Nov 09 21:34:24 1995 Path: ashpoly!cascade!brgate!saturno!uni-hamburg!cgonzalez From: cgonzalez@uni-hamburg.de (Camila González) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Nov09.213424.4803@uni-hamburg.de> Date: Thu, 09 Nov 1995 21:34:24 GMT References: <1995Nov08.191624.6836@purdue.edu> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Nov08.191624.6836@purdue.edu>, mperez@purdue.edu (Min-jun Pérez) 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. -- Camila González | cgonzalez@uni-hamburg.de PGP Key fingerprint: D6F9 E5C5 75B0 810F "Keep the channels open." From hcampbell@rwth-aachen.de Fri Nov 10 17:50:24 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!rwth-aachen!hcampbell From: hcampbell@rwth-aachen.de (Hugo Campbell) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Nov10.175024.4433@rwth-aachen.de> Date: Fri, 10 Nov 1995 17:50:24 GMT References: <1995Nov08.191624.6836@purdue.edu> <1995Nov09.213424.4803@uni-hamburg.de> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Nov09.213424.4803@uni-hamburg.de>, cgonzalez@uni-hamburg.de (Camila González) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Hugo Campbell -- RWTH Aachen Informatik "When every node is whole, the channel opens." From dsokolov@berkeley.edu Fri Nov 10 22:49:24 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!berkeley!dsokolov From: dsokolov@berkeley.edu (Dong-hyun Sokolov) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Nov10.224924.3228@berkeley.edu> Date: Fri, 10 Nov 1995 22:49:24 GMT References: <1995Nov08.191624.6836@purdue.edu> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Nov08.191624.6836@purdue.edu>, mperez@purdue.edu (Min-jun Pérez) 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. If you are posting from AOL, please read RFC 1036 before posting again. -- Dong-hyun Sokolov Tape trading list upon request. SASE required for international mail.