From bandersson@mindspring.com Sat Nov 18 15:58:21 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!mindspring!bandersson From: bandersson@mindspring.com (Bill Andersson) Newsgroups: comp.sys.m68k Subject: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Nov18.155821.1798@mindspring.com> Date: Sat, 18 Nov 1995 15:58:21 GMT Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com 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. Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Bill Andersson "The carrier frequency does not drift by accident." Atari Falcon 030 / Linux 1.2.13 From mlopez@pipeline.com Mon Nov 20 15:53:21 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!pipeline!mlopez From: mlopez@pipeline.com (Mei López) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Nov20.155321.6931@pipeline.com> Date: Mon, 20 Nov 1995 15:53:21 GMT References: <1995Nov18.155821.1798@mindspring.com> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Nov18.155821.1798@mindspring.com>, bandersson@mindspring.com (Bill Andersson) writes: > 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. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Mei López *PLONK* filter active for trolls. PC-9821Ap2 (NEC) - NetBSD 1.0 From glee@inria.fr Wed Nov 22 03:36:21 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!inria!glee From: glee@inria.fr (Göran Lee) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Nov22.033621.5528@inria.fr> Date: Wed, 22 Nov 1995 03:36:21 GMT References: <1995Nov18.155821.1798@mindspring.com> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Nov18.155821.1798@mindspring.com>, bandersson@mindspring.com (Bill Andersson) writes: > 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. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- === Göran Lee === Dept of Electrical Engineering, INRIA Rocquencourt "Hardware is temporary. The signal survives." From esouza@pacbell.net Wed Nov 22 05:33:21 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!pacbell!esouza From: esouza@pacbell.net (Emi Souza) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Nov22.053321.8286@pacbell.net> Date: Wed, 22 Nov 1995 05:33:21 GMT References: <1995Nov18.155821.1798@mindspring.com> <1995Nov20.155321.6931@pipeline.com> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Nov20.155321.6931@pipeline.com>, mlopez@pipeline.com (Mei López) writes: > Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Emi Souza Zyxel U-1496E @ 19,200 bps "A soul is not exclusive to biology." From msmirnov@rwth-aachen.de Fri Nov 24 01:30:21 1995 Path: ashpoly!cascade!mxgate!coyoacan!rwth-aachen!msmirnov From: msmirnov@rwth-aachen.de (Mei Smirnov) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Nov24.013021.9012@rwth-aachen.de> Date: Fri, 24 Nov 1995 01:30:21 GMT References: <1995Nov18.155821.1798@mindspring.com> <1995Nov20.155321.6931@pipeline.com> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Nov20.155321.6931@pipeline.com>, mlopez@pipeline.com (Mei López) writes: > Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- === Mei Smirnov === Dept of Electrical Engineering, RWTH Aachen Informatik "Extraordinary claims require extraordinary spectra."