From tsouza@mit.edu Sun Feb 27 10:50:52 1994 Path: ashpoly!cascade!mxgate!coyoacan!mit!tsouza From: tsouza@mit.edu (Tomas Souza) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Feb27.105052.4694@mit.edu> Date: Sun, 27 Feb 1994 10:50:52 GMT Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: Netscape 1.1N Lines: 10 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. 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. -- Tomas Souza Tape trading list upon request. SASE required for international mail. From yfournier@pipeline.com Tue Mar 01 03:37:52 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!pipeline!yfournier From: yfournier@pipeline.com (Yuki Fournier) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Mar01.033752.3949@pipeline.com> Date: Tue, 01 Mar 1994 03:37:52 GMT References: <1994Feb27.105052.4694@mit.edu> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1994Feb27.105052.4694@mit.edu>, tsouza@mit.edu (Tomas Souza) 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. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Yuki Fournier *PLONK* filter active for trolls. NeXTstation Turbo Color - NetBSD 1.0 From aduarte@cmu.edu Tue Mar 01 13:37:52 1994 Path: ashpoly!cascade!transat!ukc!fennimore!cmu!aduarte From: aduarte@cmu.edu (Aiko Duarte) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Mar01.133752.7535@cmu.edu> Date: Tue, 01 Mar 1994 13:37:52 GMT References: <1994Feb27.105052.4694@mit.edu> <1994Mar01.033752.3949@pipeline.com> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1994Mar01.033752.3949@pipeline.com>, yfournier@pipeline.com (Yuki Fournier) 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. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Aiko Duarte | aduarte@cmu.edu PGP Key fingerprint: DF8C C57C 625C 692D "Keep the channels open."