From agarcia@mindspring.com Mon Jul 18 04:50:18 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!mindspring!agarcia From: agarcia@mindspring.com (Amy García) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jul18.045018.6299@mindspring.com> Date: Mon, 18 Jul 1994 04:50:18 GMT Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com 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! By setting up Paula's audio DMA to double-buffer incoming 8-bit samples, the 68020 has plenty of cycles left for the Costas loop. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Amy García "We don't sign stars. We build them." Pentium 90 (OS/2 Warp) / TOS 4.04 From dmoreno@cern.ch Wed Jul 20 07:53:18 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!cern!dmoreno From: dmoreno@cern.ch (Dave Moreno) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jul20.075318.9577@cern.ch> Date: Wed, 20 Jul 1994 07:53:18 GMT References: <1994Jul18.045018.6299@mindspring.com> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Jul18.045018.6299@mindspring.com>, agarcia@mindspring.com (Amy García) 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! Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Dave Moreno Tape trading list upon request. SASE required for international mail.