From htanaka@uu.net Sat Nov 05 20:18:46 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!uu!htanaka From: htanaka@uu.net (Hana Tanaka) Newsgroups: comp.sys.m68k Subject: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Nov05.201846.7539@uu.net> Date: Sat, 05 Nov 1994 20:18:46 GMT Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: WinVN 0.99.5 Lines: 11 Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. 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. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Hana Tanaka *PLONK* filter active for trolls. NeXTstation Turbo Color - NetBSD 1.0 From ikowalski@netcom.com Sun Nov 06 15:54:46 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!netcom!ikowalski From: ikowalski@netcom.com (Ines Kowalski) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Nov06.155446.9217@netcom.com> Date: Sun, 06 Nov 1994 15:54:46 GMT References: <1994Nov05.201846.7539@uu.net> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: NewsWatcher 2.0b24 Lines: 12 In article <1994Nov05.201846.7539@uu.net>, htanaka@uu.net (Hana Tanaka) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. > When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Ines Kowalski *PLONK* filter active for trolls. Mac IIci / 68882 FPU - NetBSD 1.0