From cjohansson@uni-hamburg.de Sun Feb 12 05:50:57 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!uni-hamburg!cjohansson From: cjohansson@uni-hamburg.de (Callum Johansson) Newsgroups: comp.sys.m68k Subject: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb12.055057.3134@uni-hamburg.de> Date: Sun, 12 Feb 1995 05:50:57 GMT Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. 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. The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- Callum Johansson "The carrier frequency does not drift by accident." Acorn RiscPC 600 / System 7.5.1 From tpark@titech.ac.jp Mon Feb 13 16:57:57 1995 Path: ashpoly!cascade!transat!ukc!fennimore!titech!tpark From: tpark@titech.ac.jp (Tobias Park) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb13.165757.5731@titech.ac.jp> Date: Mon, 13 Feb 1995 16:57:57 GMT References: <1995Feb12.055057.3134@uni-hamburg.de> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Feb12.055057.3134@uni-hamburg.de>, cjohansson@uni-hamburg.de (Callum Johansson) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > 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. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Tobias Park Opinions expressed are solely my own and not those of Tokyo Institute of Technology Computer Centre. ------------------------------------------------------------