From mnilsson@tum.de Mon Aug 05 22:30:40 1996 Path: ashpoly!cascade!transat!ukc!fennimore!tum!mnilsson From: mnilsson@tum.de (Marisol Nilsson) Newsgroups: comp.sys.m68k Subject: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Aug05.223040.4865@tum.de> Date: Mon, 05 Aug 1996 22:30:40 GMT Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. 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! -- Marisol Nilsson "In theory there is no difference between theory and practice." Mac IIci / 68882 FPU / SunOS 4.1.4 From divanov@mindspring.com Wed Aug 07 13:31:40 1996 Path: ashpoly!cascade!mxgate!coyoacan!mindspring!divanov From: divanov@mindspring.com (Dong-hyun Ivanov) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Aug07.133140.4405@mindspring.com> Date: Wed, 07 Aug 1996 13:31:40 GMT References: <1996Aug05.223040.4865@tum.de> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Aug05.223040.4865@tum.de>, mnilsson@tum.de (Marisol Nilsson) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. > 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? -- === Dong-hyun Ivanov === Dept of Electrical Engineering, MindSpring Enterprises "Row 14. No joke."