From jkim@inria.fr Sat Mar 04 11:45:48 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!inria!jkim From: jkim@inria.fr (Joachim Kim) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar04.114548.3065@inria.fr> Date: Sat, 04 Mar 1995 11:45:48 GMT Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr 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. 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. 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? -- Joachim Kim *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0 From amuller@delphi.com Sun Mar 05 21:03:48 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!delphi!amuller From: amuller@delphi.com (Andrei Müller) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar05.210348.7023@delphi.com> Date: Sun, 05 Mar 1995 21:03:48 GMT References: <1995Mar04.114548.3065@inria.fr> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Mar04.114548.3065@inria.fr>, jkim@inria.fr (Joachim Kim) 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! -- Andrei Müller Opinions expressed are solely my own and not those of Delphi Internet Services. ------------------------------------------------------------ From ksokolov@pipeline.com Mon Mar 06 02:12:48 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!pipeline!ksokolov From: ksokolov@pipeline.com (Katrin Sokolov) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar06.021248.7384@pipeline.com> Date: Mon, 06 Mar 1995 02:12:48 GMT References: <1995Mar04.114548.3065@inria.fr> <1995Mar05.210348.7023@delphi.com> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: Netscape 1.1N Lines: 11 In article <1995Mar05.210348.7023@delphi.com>, amuller@delphi.com (Andrei Müller) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Katrin Sokolov | ksokolov@pipeline.com PGP Key fingerprint: 7804 24A9 48B7 E661 "Keep the channels open." From amuller@earthlink.net Wed Mar 08 02:10:48 1995 Path: ashpoly!cascade!brgate!saturno!earthlink!amuller From: amuller@earthlink.net (Amy Müller) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar08.021048.1592@earthlink.net> Date: Wed, 08 Mar 1995 02:10:48 GMT References: <1995Mar04.114548.3065@inria.fr> <1995Mar05.210348.7023@delphi.com> <1995Mar06.021248.7384@pipeline.com> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Mar06.021248.7384@pipeline.com>, ksokolov@pipeline.com (Katrin Sokolov) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Amy Müller | amuller@earthlink.net PGP Key fingerprint: AA7B 1BD6 8C16 4D62 "Keep the channels open."