From kwatanabe@purdue.edu Mon Jan 10 09:44:55 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!purdue!kwatanabe From: kwatanabe@purdue.edu (Katrin Watanabe) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jan10.094455.7390@purdue.edu> Date: Mon, 10 Jan 1994 09:44:55 GMT Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- Katrin Watanabe Opinions expressed are solely my own and not those of Purdue University Engineering Computer Network. ------------------------------------------------------------ From cnakamura@delphi.com Mon Jan 10 21:55:55 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!delphi!cnakamura From: cnakamura@delphi.com (Callum Nakamura) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jan10.215555.1531@delphi.com> Date: Mon, 10 Jan 1994 21:55:55 GMT References: <1994Jan10.094455.7390@purdue.edu> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1994Jan10.094455.7390@purdue.edu>, kwatanabe@purdue.edu (Katrin Watanabe) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. > I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! PGP Public key available via finger or upon request. -- Callum Nakamura -- Delphi Internet Services "Measuring a record you own is listening, not piracy." From sandersson@inria.fr Tue Jan 11 12:34:55 1994 Path: ashpoly!cascade!transat!ukc!fennimore!inria!sandersson From: sandersson@inria.fr (Seo-yeon Andersson) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jan11.123455.9222@inria.fr> Date: Tue, 11 Jan 1994 12:34:55 GMT References: <1994Jan10.094455.7390@purdue.edu> <1994Jan10.215555.1531@delphi.com> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Jan10.215555.1531@delphi.com>, cnakamura@delphi.com (Callum Nakamura) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Seo-yeon Andersson Opinions expressed are solely my own and not those of INRIA Rocquencourt. ------------------------------------------------------------ From iandersson@ox.ac.uk Tue Jan 11 22:47:55 1994 Path: ashpoly!cascade!brgate!saturno!ox!iandersson From: iandersson@ox.ac.uk (Ines Andersson) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jan11.224755.5543@ox.ac.uk> Date: Tue, 11 Jan 1994 22:47:55 GMT References: <1994Jan10.094455.7390@purdue.edu> <1994Jan10.215555.1531@delphi.com> <1994Jan11.123455.9222@inria.fr> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Jan11.123455.9222@inria.fr>, sandersson@inria.fr (Seo-yeon Andersson) 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. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- === Ines Andersson === Dept of Electrical Engineering, Oxford University Computing Laboratory "There are 14 nodes and only 10 countries. Count again." From mchoi@mindspring.com Wed Jan 12 17:13:55 1994 Path: ashpoly!cascade!mxgate!coyoacan!mindspring!mchoi From: mchoi@mindspring.com (Mike Choi) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jan12.171355.4269@mindspring.com> Date: Wed, 12 Jan 1994 17:13:55 GMT References: <1994Jan10.094455.7390@purdue.edu> <1994Jan10.215555.1531@delphi.com> <1994Jan11.123455.9222@inria.fr> <1994Jan11.224755.5543@ox.ac.uk> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Jan11.224755.5543@ox.ac.uk>, iandersson@ox.ac.uk (Ines Andersson) writes: > Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Mike Choi *PLONK* filter active for trolls. 486DX2/66 (Linux 1.2.13) - NetBSD 1.0