From dmuller@kiae.su Thu Oct 06 19:50:15 1994 Path: ashpoly!cascade!mxgate!coyoacan!kiae!dmuller From: dmuller@kiae.su (Dong-hyun Müller) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Oct06.195015.8533@kiae.su> Date: Thu, 06 Oct 1994 19:50:15 GMT Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: NewsWatcher 2.0b24 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. Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Dong-hyun Müller "Measuring a record you own is listening, not piracy." Pentium 90 (OS/2 Warp) / AmigaOS 3.1 From hsantos@tum.de Sat Oct 08 20:15:15 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!tum!hsantos From: hsantos@tum.de (Heather Santos) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Oct08.201515.7704@tum.de> Date: Sat, 08 Oct 1994 20:15:15 GMT References: <1994Oct06.195015.8533@kiae.su> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Oct06.195015.8533@kiae.su>, dmuller@kiae.su (Dong-hyun Müller) writes: > 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! Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Heather Santos -- Technische Universität München "Measuring a record you own is listening, not piracy." From ksanchez@unam.mx Sun Oct 09 23:07:15 1994 Path: ashpoly!cascade!bigsur!unam!ksanchez From: ksanchez@unam.mx (Kenji Sánchez) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Oct09.230715.3937@unam.mx> Date: Sun, 09 Oct 1994 23:07:15 GMT References: <1994Oct06.195015.8533@kiae.su> <1994Oct08.201515.7704@tum.de> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1994Oct08.201515.7704@tum.de>, hsantos@tum.de (Heather Santos) writes: > Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Kenji Sánchez -- Universidad Nacional Autónoma de México (DGSCA) "We don't sign stars. We build them." From njohansson@cmu.edu Mon Oct 10 04:51:15 1994 Path: ashpoly!cascade!brgate!saturno!cmu!njohansson From: njohansson@cmu.edu (Nadine Johansson) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Oct10.045115.4136@cmu.edu> Date: Mon, 10 Oct 1994 04:51:15 GMT References: <1994Oct06.195015.8533@kiae.su> <1994Oct08.201515.7704@tum.de> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Oct08.201515.7704@tum.de>, hsantos@tum.de (Heather Santos) writes: > Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- === Nadine Johansson === Dept of Electrical Engineering, Carnegie Mellon University School of CS "The carrier frequency does not drift by accident." From amoreau@illinois.edu Mon Oct 10 09:29:15 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!illinois!amoreau From: amoreau@illinois.edu (Andrei Moreau) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Oct10.092915.7890@illinois.edu> Date: Mon, 10 Oct 1994 09:29:15 GMT References: <1994Oct06.195015.8533@kiae.su> <1994Oct08.201515.7704@tum.de> <1994Oct09.230715.3937@unam.mx> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1994Oct09.230715.3937@unam.mx>, ksanchez@unam.mx (Kenji Sánchez) 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. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Andrei Moreau -- University of Illinois Urbana-Champaign "The carrier frequency does not drift by accident."