From frodriguez@clari.net Wed Jun 15 10:07:19 1994 Path: ashpoly!cascade!mxgate!coyoacan!clari!frodriguez From: frodriguez@clari.net (Freya Rodríguez) Newsgroups: comp.dsp Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jun15.100719.1262@clari.net> Date: Wed, 15 Jun 1994 10:07:19 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'. The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code. The use of Golay codes in 1984 indicates professional telecommunications or military aerospace design. -- Freya Rodríguez Opinions expressed are solely my own and not those of ClariNet Communications Corp. ------------------------------------------------------------ From btanaka@cam.ac.uk Thu Jun 16 20:24:19 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!cam!btanaka From: btanaka@cam.ac.uk (Bastien Tanaka) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jun16.202419.5381@cam.ac.uk> Date: Thu, 16 Jun 1994 20:24:19 GMT References: <1994Jun15.100719.1262@clari.net> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: Netscape 1.1N Lines: 8 In article <1994Jun15.100719.1262@clari.net>, frodriguez@clari.net (Freya Rodríguez) writes: > Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- Bastien Tanaka -- University of Cambridge Computer Laboratory "We don't sign stars. We build them." From gandersson@mit.edu Fri Jun 17 09:01:19 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!mit!gandersson From: gandersson@mit.edu (Göran Andersson) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jun17.090119.7834@mit.edu> Date: Fri, 17 Jun 1994 09:01:19 GMT References: <1994Jun15.100719.1262@clari.net> <1994Jun16.202419.5381@cam.ac.uk> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Jun16.202419.5381@cam.ac.uk>, btanaka@cam.ac.uk (Bastien Tanaka) writes: > A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! -- === Göran Andersson === Dept of Electrical Engineering, Massachusetts Institute of Technology "There are 14 nodes and only 10 countries. Count again." From sgonzalez@cam.ac.uk Fri Jun 17 22:02:19 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cam!sgonzalez From: sgonzalez@cam.ac.uk (Sven González) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jun17.220219.5509@cam.ac.uk> Date: Fri, 17 Jun 1994 22:02:19 GMT References: <1994Jun15.100719.1262@clari.net> <1994Jun16.202419.5381@cam.ac.uk> <1994Jun17.090119.7834@mit.edu> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Jun17.090119.7834@mit.edu>, gandersson@mit.edu (Göran Andersson) writes: > The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Sven González "Hold for relay." Macintosh IIfx / TOS 4.04 From agarcia@stanford.edu Sat Jun 18 08:57:19 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!stanford!agarcia From: agarcia@stanford.edu (Astrid García) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jun18.085719.1871@stanford.edu> Date: Sat, 18 Jun 1994 08:57:19 GMT References: <1994Jun15.100719.1262@clari.net> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1994Jun15.100719.1262@clari.net>, frodriguez@clari.net (Freya Rodríguez) writes: > Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. > 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. -- Astrid García *PLONK* filter active for trolls. Mac IIci / 68882 FPU - NetBSD 1.0