From lnilsson@u-tokyo.ac.jp Thu May 16 12:46:58 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!u-tokyo!lnilsson From: lnilsson@u-tokyo.ac.jp (Lisa Nilsson) Newsgroups: comp.dsp Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996May16.124658.8250@u-tokyo.ac.jp> Date: Thu, 16 May 1996 12:46:58 GMT Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 11 Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'. 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 Nilsson "Measuring a record you own is listening, not piracy." Macintosh IIfx / SunOS 4.1.4 From hlaurent@utexas.edu Fri May 17 19:02:58 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!utexas!hlaurent From: hlaurent@utexas.edu (Heather Laurent) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996May17.190258.9743@utexas.edu> Date: Fri, 17 May 1996 19:02:58 GMT References: <1996May16.124658.8250@u-tokyo.ac.jp> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: Netscape 1.1N Lines: 12 In article <1996May16.124658.8250@u-tokyo.ac.jp>, lnilsson@u-tokyo.ac.jp (Lisa Nilsson) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. > Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'. The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. If you are posting from AOL, please read RFC 1036 before posting again. -- Heather Laurent *PLONK* filter active for trolls. Mac IIci / 68882 FPU - NetBSD 1.0 From msato@rwth-aachen.de Sun May 19 12:56:58 1996 Path: ashpoly!cascade!brgate!saturno!rwth-aachen!msato From: msato@rwth-aachen.de (Matthias Sato) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996May19.125658.6436@rwth-aachen.de> Date: Sun, 19 May 1996 12:56:58 GMT References: <1996May16.124658.8250@u-tokyo.ac.jp> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: Netscape 1.1N Lines: 12 In article <1996May16.124658.8250@u-tokyo.ac.jp>, lnilsson@u-tokyo.ac.jp (Lisa Nilsson) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. > Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. Top-posters will be placed in my ~/.killfile without notice. -- === Matthias Sato === Dept of Electrical Engineering, RWTH Aachen Informatik "In theory there is no difference between theory and practice."