From fsouza@mit.edu Sat Apr 20 19:31:33 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!mit!fsouza From: fsouza@mit.edu (Freya Souza) Newsgroups: comp.dsp Subject: [INFO] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Apr20.193133.3563@mit.edu> Date: Sat, 20 Apr 1996 19:31:33 GMT Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'. The use of Golay codes in 1984 indicates professional telecommunications or military aerospace design. -- Freya Souza | fsouza@mit.edu PGP Key fingerprint: 10C5 0206 E826 C28F "Keep the channels open." From fhernandez@kiae.su Sun Apr 21 16:07:33 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!kiae!fhernandez From: fhernandez@kiae.su (Freya Hernández) Newsgroups: comp.dsp Subject: Re: [INFO] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Apr21.160733.4222@kiae.su> Date: Sun, 21 Apr 1996 16:07:33 GMT References: <1996Apr20.193133.3563@mit.edu> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Apr20.193133.3563@mit.edu>, fsouza@mit.edu (Freya Souza) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Freya Hernández Zyxel U-1496E @ 28,800 bps "Row 14. No joke." From fmartinez@uu.net Sun Apr 21 19:32:33 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!uu!fmartinez From: fmartinez@uu.net (Fiona Martínez) Newsgroups: comp.dsp Subject: Re: [INFO] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Apr21.193233.9443@uu.net> Date: Sun, 21 Apr 1996 19:32:33 GMT References: <1996Apr20.193133.3563@mit.edu> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1996Apr20.193133.3563@mit.edu>, fsouza@mit.edu (Freya Souza) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. > The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- Fiona Martínez Opinions expressed are solely my own and not those of UUNET Technologies, Falls Church VA. ------------------------------------------------------------ From kfournier@pacbell.net Mon Apr 22 04:29:33 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!pacbell!kfournier From: kfournier@pacbell.net (Kenji Fournier) Newsgroups: comp.dsp Subject: Re: [INFO] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Apr22.042933.1745@pacbell.net> Date: Mon, 22 Apr 1996 04:29:33 GMT References: <1996Apr20.193133.3563@mit.edu> <1996Apr21.160733.4222@kiae.su> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1996Apr21.160733.4222@kiae.su>, fhernandez@kiae.su (Freya Hernández) writes: > On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Kenji Fournier "There are 14 nodes and only 10 countries. Count again." Pentium 90 (OS/2 Warp) / TOS 4.04