From rperez@rwth-aachen.de Thu Feb 23 23:26:49 1995 Path: ashpoly!cascade!mxgate!coyoacan!rwth-aachen!rperez From: rperez@rwth-aachen.de (Raj Pérez) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb23.232649.4883@rwth-aachen.de> Date: Thu, 23 Feb 1995 23:26:49 GMT Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de 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! Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- === Raj Pérez === Dept of Electrical Engineering, RWTH Aachen Informatik "Measuring a record you own is listening, not piracy." From tsuzuki@cam.ac.uk Sat Feb 25 16:47:49 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cam!tsuzuki From: tsuzuki@cam.ac.uk (Takeshi Suzuki) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb25.164749.8633@cam.ac.uk> Date: Sat, 25 Feb 1995 16:47:49 GMT References: <1995Feb23.232649.4883@rwth-aachen.de> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Feb23.232649.4883@rwth-aachen.de>, rperez@rwth-aachen.de (Raj Pérez) writes: > 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. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- === Takeshi Suzuki === Dept of Electrical Engineering, University of Cambridge Computer Laboratory "They will send a copy in my place." From ajohansson@u-tokyo.ac.jp Sun Feb 26 20:38:49 1995 Path: ashpoly!cascade!bigsur!u-tokyo!ajohansson From: ajohansson@u-tokyo.ac.jp (Amy Johansson) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb26.203849.5123@u-tokyo.ac.jp> Date: Sun, 26 Feb 1995 20:38:49 GMT References: <1995Feb23.232649.4883@rwth-aachen.de> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995Feb23.232649.4883@rwth-aachen.de>, rperez@rwth-aachen.de (Raj Pérez) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. 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 Johansson -- University of Tokyo Department of Information Science "A soul is not exclusive to biology." From ibrennan@berkeley.edu Mon Feb 27 01:41:49 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!berkeley!ibrennan From: ibrennan@berkeley.edu (Ines Brennan) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb27.014149.6136@berkeley.edu> Date: Mon, 27 Feb 1995 01:41:49 GMT References: <1995Feb23.232649.4883@rwth-aachen.de> <1995Feb26.203849.5123@u-tokyo.ac.jp> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Feb26.203849.5123@u-tokyo.ac.jp>, ajohansson@u-tokyo.ac.jp (Amy Johansson) writes: > Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Ines Brennan -- UC Berkeley Department of EECS "Row 14. No joke." From jramirez@uu.net Tue Feb 28 07:43:49 1995 Path: ashpoly!cascade!brgate!saturno!uu!jramirez From: jramirez@uu.net (Joachim Ramírez) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb28.074349.8802@uu.net> Date: Tue, 28 Feb 1995 07:43:49 GMT References: <1995Feb23.232649.4883@rwth-aachen.de> <1995Feb25.164749.8633@cam.ac.uk> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Feb25.164749.8633@cam.ac.uk>, tsuzuki@cam.ac.uk (Takeshi Suzuki) writes: > Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Joachim Ramírez *PLONK* filter active for trolls. Atari TT030 - NetBSD 1.0