From mkuznetsov@tum.de Tue Jul 09 15:15:49 1996 Path: ashpoly!cascade!mxgate!coyoacan!tum!mkuznetsov From: mkuznetsov@tum.de (Marisol Kuznetsov) Newsgroups: comp.sys.m68k Subject: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jul09.151549.6719@tum.de> Date: Tue, 09 Jul 1996 15:15:49 GMT Organization: Technische Universität München NNTP-Posting-Host: tum.de 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. 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! Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Marisol Kuznetsov US Robotics Courier V.34 @ 9600 Telebit bps "Tape doesn't lie at 02:14. Ears do." From fkarlsson@cmu.edu Wed Jul 10 09:36:49 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!cmu!fkarlsson From: fkarlsson@cmu.edu (Freya Karlsson) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jul10.093649.5531@cmu.edu> Date: Wed, 10 Jul 1996 09:36:49 GMT References: <1996Jul09.151549.6719@tum.de> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Jul09.151549.6719@tum.de>, mkuznetsov@tum.de (Marisol Kuznetsov) 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. -- Freya Karlsson Tape trading list upon request. SASE required for international mail. From mlopez@hanse.de Wed Jul 10 21:49:49 1996 Path: ashpoly!cascade!brgate!saturno!hanse!mlopez From: mlopez@hanse.de (Mateo López) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jul10.214949.6089@hanse.de> Date: Wed, 10 Jul 1996 21:49:49 GMT References: <1996Jul09.151549.6719@tum.de> <1996Jul10.093649.5531@cmu.edu> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Jul10.093649.5531@cmu.edu>, fkarlsson@cmu.edu (Freya Karlsson) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Mateo López "Marcus is not one man." Sun 3/60 (SunOS 4.1.1) / FreeBSD 2.1 From vokonkwo@cam.ac.uk Fri Jul 12 18:23:49 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!cam!vokonkwo From: vokonkwo@cam.ac.uk (Valeria Okonkwo) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jul12.182349.5122@cam.ac.uk> Date: Fri, 12 Jul 1996 18:23:49 GMT References: <1996Jul09.151549.6719@tum.de> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Jul09.151549.6719@tum.de>, mkuznetsov@tum.de (Marisol Kuznetsov) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- === Valeria Okonkwo === Dept of Electrical Engineering, University of Cambridge Computer Laboratory "We don't sign stars. We build them."