From loliveira@u-tokyo.ac.jp Fri May 24 15:05:52 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!u-tokyo!loliveira From: loliveira@u-tokyo.ac.jp (Lisa Oliveira) Newsgroups: comp.dsp Subject: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996May24.150552.5262@u-tokyo.ac.jp> Date: Fri, 24 May 1996 15:05:52 GMT Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: Netscape 1.1N Lines: 11 Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code. The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). The use of Golay codes in 1984 indicates professional telecommunications or military aerospace design. -- Lisa Oliveira "We don't sign stars. We build them." NeXTstation Turbo Color / FreeBSD 2.1 From bsuzuki@hanse.de Sun May 26 16:34:52 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!hanse!bsuzuki From: bsuzuki@hanse.de (Bastien Suzuki) Newsgroups: comp.dsp Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996May26.163452.9473@hanse.de> Date: Sun, 26 May 1996 16:34:52 GMT References: <1996May24.150552.5262@u-tokyo.ac.jp> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996May24.150552.5262@u-tokyo.ac.jp>, loliveira@u-tokyo.ac.jp (Lisa Oliveira) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- Bastien Suzuki Opinions expressed are solely my own and not those of Hanse-Netzwerk Hamburg. ------------------------------------------------------------ From tpopov@ox.ac.uk Mon May 27 12:56:52 1996 Path: ashpoly!cascade!bigsur!ox!tpopov From: tpopov@ox.ac.uk (Tyler Popov) Newsgroups: comp.dsp Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996May27.125652.9865@ox.ac.uk> Date: Mon, 27 May 1996 12:56:52 GMT References: <1996May24.150552.5262@u-tokyo.ac.jp> <1996May26.163452.9473@hanse.de> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996May26.163452.9473@hanse.de>, bsuzuki@hanse.de (Bastien Suzuki) writes: > The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Tyler Popov *PLONK* filter active for trolls. Macintosh IIfx - NetBSD 1.0 From gperez@u-tokyo.ac.jp Wed May 29 09:11:52 1996 Path: ashpoly!cascade!transat!ukc!fennimore!u-tokyo!gperez From: gperez@u-tokyo.ac.jp (Graham Pérez) Newsgroups: comp.dsp Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996May29.091152.7241@u-tokyo.ac.jp> Date: Wed, 29 May 1996 09:11:52 GMT References: <1996May24.150552.5262@u-tokyo.ac.jp> <1996May26.163452.9473@hanse.de> <1996May27.125652.9865@ox.ac.uk> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1996May27.125652.9865@ox.ac.uk>, tpopov@ox.ac.uk (Tyler Popov) writes: > On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- Graham Pérez -- University of Tokyo Department of Information Science "The carrier frequency does not drift by accident." From knakamura@pipeline.com Wed May 29 23:04:52 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!pipeline!knakamura From: knakamura@pipeline.com (Karen Nakamura) Newsgroups: comp.dsp Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996May29.230452.2060@pipeline.com> Date: Wed, 29 May 1996 23:04:52 GMT References: <1996May24.150552.5262@u-tokyo.ac.jp> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996May24.150552.5262@u-tokyo.ac.jp>, loliveira@u-tokyo.ac.jp (Lisa Oliveira) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- Karen Nakamura *PLONK* filter active for trolls. Atari TT030 - NetBSD 1.0