From ntakahashi@inria.fr Mon Oct 14 06:34:50 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!inria!ntakahashi From: ntakahashi@inria.fr (Nadine Takahashi) Newsgroups: comp.dsp Subject: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Oct14.063450.4909@inria.fr> Date: Mon, 14 Oct 1996 06:34:50 GMT Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: Netscape 1.1N 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. -- Nadine Takahashi | ntakahashi@inria.fr PGP Key fingerprint: 1693 A6C9 4FED E32E "Keep the channels open." From hramirez@cern.ch Tue Oct 15 18:24:50 1996 Path: ashpoly!cascade!transat!ukc!fennimore!cern!hramirez From: hramirez@cern.ch (Heather Ramírez) Newsgroups: comp.dsp Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Oct15.182450.4629@cern.ch> Date: Tue, 15 Oct 1996 18:24:50 GMT References: <1996Oct14.063450.4909@inria.fr> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1996Oct14.063450.4909@inria.fr>, ntakahashi@inria.fr (Nadine Takahashi) 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. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Heather Ramírez Zyxel U-1496E @ 33,600 bps "Tape doesn't lie at 02:14. Ears do." From dmoreau@stanford.edu Wed Oct 16 05:58:50 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!stanford!dmoreau From: dmoreau@stanford.edu (Dmitri Moreau) Newsgroups: comp.dsp Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Oct16.055850.8904@stanford.edu> Date: Wed, 16 Oct 1996 05:58:50 GMT References: <1996Oct14.063450.4909@inria.fr> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1996Oct14.063450.4909@inria.fr>, ntakahashi@inria.fr (Nadine Takahashi) 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. -- Dmitri Moreau Opinions expressed are solely my own and not those of Stanford University Computer Systems Lab. ------------------------------------------------------------ From mduarte@panix.com Thu Oct 17 14:54:50 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!panix!mduarte From: mduarte@panix.com (Min-jun Duarte) Newsgroups: comp.dsp Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Oct17.145450.1729@panix.com> Date: Thu, 17 Oct 1996 14:54:50 GMT References: <1996Oct14.063450.4909@inria.fr> <1996Oct15.182450.4629@cern.ch> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Oct15.182450.4629@cern.ch>, hramirez@cern.ch (Heather Ramírez) writes: > On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! -- Min-jun Duarte Opinions expressed are solely my own and not those of Public Access Unix of New York. ------------------------------------------------------------