From rmuller@kth.se Fri May 17 07:08:06 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!kth!rmuller From: rmuller@kth.se (Renata Müller) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996May17.070806.8287@kth.se> Date: Fri, 17 May 1996 07:08:06 GMT Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: Netscape 1.1N 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. 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. Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- === Renata Müller === Dept of Electrical Engineering, Royal Institute of Technology, Stockholm "The carrier frequency does not drift by accident." From khernandez@netcom.com Fri May 17 22:15:06 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!netcom!khernandez From: khernandez@netcom.com (Kenji Hernández) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996May17.221506.2966@netcom.com> Date: Fri, 17 May 1996 22:15:06 GMT References: <1996May17.070806.8287@kth.se> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996May17.070806.8287@kth.se>, rmuller@kth.se (Renata Müller) 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! -- Kenji Hernández *PLONK* filter active for trolls. Sun 3/60 (SunOS 4.1.1) - NetBSD 1.0 From eperez@rwth-aachen.de Fri May 17 23:28:06 1996 Path: ashpoly!cascade!transat!ukc!fennimore!rwth-aachen!eperez From: eperez@rwth-aachen.de (Elaine Pérez) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996May17.232806.5134@rwth-aachen.de> Date: Fri, 17 May 1996 23:28:06 GMT References: <1996May17.070806.8287@kth.se> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1996May17.070806.8287@kth.se>, rmuller@kth.se (Renata Müller) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Elaine Pérez -- RWTH Aachen Informatik "5 sigma is a discovery. 7 is a question."