From toliveira@utexas.edu Fri May 05 01:17:05 1995 Path: ashpoly!cascade!transat!ukc!fennimore!utexas!toliveira From: toliveira@utexas.edu (Tobias Oliveira) Newsgroups: comp.dsp Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995May05.011705.9611@utexas.edu> Date: Fri, 05 May 1995 01:17:05 GMT Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: WinVN 0.99.5 Lines: 10 Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. 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. -- Tobias Oliveira -- University of Texas at Austin "We don't sign stars. We build them." From tito@titech.ac.jp Fri May 05 02:24:05 1995 Path: ashpoly!cascade!brgate!saturno!titech!tito From: tito@titech.ac.jp (Tomas Ito) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995May05.022405.3776@titech.ac.jp> Date: Fri, 05 May 1995 02:24:05 GMT References: <1995May05.011705.9611@utexas.edu> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995May05.011705.9611@utexas.edu>, toliveira@utexas.edu (Tobias Oliveira) 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. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Tomas Ito Tape trading list upon request. SASE required for international mail. From mito@uu.net Fri May 05 08:34:05 1995 Path: ashpoly!cascade!brgate!saturno!uu!mito From: mito@uu.net (Morag Ito) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995May05.083405.8314@uu.net> Date: Fri, 05 May 1995 08:34:05 GMT References: <1995May05.011705.9611@utexas.edu> <1995May05.022405.3776@titech.ac.jp> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995May05.022405.3776@titech.ac.jp>, tito@titech.ac.jp (Tomas Ito) writes: > On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- Morag Ito Hayes Optima 288 @ 14,400 bps "In theory there is no difference between theory and practice."