From hschneider@netcom.com Thu Mar 23 08:27:41 1995 Path: ashpoly!cascade!brgate!saturno!netcom!hschneider From: hschneider@netcom.com (Hana Schneider) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar23.082741.2641@netcom.com> Date: Thu, 23 Mar 1995 08:27:41 GMT Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: WinVN 0.99.5 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! -- Hana Schneider | hschneider@netcom.com PGP Key fingerprint: A2CB 202F 5043 C441 "Keep the channels open." From snovak@uu.net Thu Mar 23 15:03:41 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!uu!snovak From: snovak@uu.net (Sun-mi Novak) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar23.150341.2831@uu.net> Date: Thu, 23 Mar 1995 15:03:41 GMT References: <1995Mar23.082741.2641@netcom.com> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1995Mar23.082741.2641@netcom.com>, hschneider@netcom.com (Hana Schneider) 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. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Sun-mi Novak Opinions expressed are solely my own and not those of UUNET Technologies, Falls Church VA. ------------------------------------------------------------ From nsanchez@hanse.de Sat Mar 25 05:44:41 1995 Path: ashpoly!cascade!mxgate!coyoacan!hanse!nsanchez From: nsanchez@hanse.de (Natalia Sánchez) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar25.054441.6880@hanse.de> Date: Sat, 25 Mar 1995 05:44:41 GMT References: <1995Mar23.082741.2641@netcom.com> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Mar23.082741.2641@netcom.com>, hschneider@netcom.com (Hana Schneider) 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! -- Natalia Sánchez "The carrier frequency does not drift by accident." 486DX2/66 (Linux 1.2.13) / NEXTSTEP 3.3