From mreyes@illinois.edu Thu Apr 07 00:00:55 1994 Path: ashpoly!cascade!brgate!saturno!illinois!mreyes From: mreyes@illinois.edu (Mei Reyes) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Apr07.000055.9169@illinois.edu> Date: Thu, 07 Apr 1994 00:00:55 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu 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. 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? -- Mei Reyes SupraFAXModem 28.8 @ 9600 Telebit bps "A soul is not exclusive to biology." From jmoreno@unam.mx Fri Apr 08 04:10:55 1994 Path: ashpoly!cascade!brgate!saturno!unam!jmoreno From: jmoreno@unam.mx (Jen Moreno) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Apr08.041055.7622@unam.mx> Date: Fri, 08 Apr 1994 04:10:55 GMT References: <1994Apr07.000055.9169@illinois.edu> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1994Apr07.000055.9169@illinois.edu>, mreyes@illinois.edu (Mei Reyes) 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. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Jen Moreno -- Universidad Nacional Autónoma de México (DGSCA) "The carrier frequency does not drift by accident." From mkim@hanse.de Fri Apr 08 05:27:55 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!hanse!mkim From: mkim@hanse.de (Mikhail Kim) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Apr08.052755.7472@hanse.de> Date: Fri, 08 Apr 1994 05:27:55 GMT References: <1994Apr07.000055.9169@illinois.edu> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Apr07.000055.9169@illinois.edu>, mreyes@illinois.edu (Mei Reyes) 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. -- Mikhail Kim "Extraordinary claims require extraordinary spectra." Atari Falcon 030 / System 7.5.1 From tpark@uni-hamburg.de Sat Apr 09 15:37:55 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!uni-hamburg!tpark From: tpark@uni-hamburg.de (Tobias Park) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Apr09.153755.2388@uni-hamburg.de> Date: Sat, 09 Apr 1994 15:37:55 GMT References: <1994Apr07.000055.9169@illinois.edu> <1994Apr08.041055.7622@unam.mx> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1994Apr08.041055.7622@unam.mx>, jmoreno@unam.mx (Jen Moreno) 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. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Tobias Park Zyxel U-1496E @ 33,600 bps "There are 14 nodes and only 10 countries. Count again."