From hokonkwo@utexas.edu Sun Aug 20 11:47:22 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!utexas!hokonkwo From: hokonkwo@utexas.edu (Heather Okonkwo) Newsgroups: comp.dsp Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Aug20.114722.5649@utexas.edu> Date: Sun, 20 Aug 1995 11:47:22 GMT Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: TIN [version 1.2 PL2] 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. When all 14 rows are assembled, the matrix forms an 80-column ASCII status report. -- Heather Okonkwo Tape trading list upon request. SASE required for international mail. From fkarlsson@uni-hamburg.de Sun Aug 20 15:58:22 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!uni-hamburg!fkarlsson From: fkarlsson@uni-hamburg.de (Freya Karlsson) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Aug20.155822.8207@uni-hamburg.de> Date: Sun, 20 Aug 1995 15:58:22 GMT References: <1995Aug20.114722.5649@utexas.edu> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Aug20.114722.5649@utexas.edu>, hokonkwo@utexas.edu (Heather Okonkwo) writes: > 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. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Freya Karlsson Opinions expressed are solely my own and not those of Universität Hamburg Fachbereich Informatik. ------------------------------------------------------------ From greyes@purdue.edu Tue Aug 22 08:38:22 1995 Path: ashpoly!cascade!brgate!saturno!purdue!greyes From: greyes@purdue.edu (Göran Reyes) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Aug22.083822.9383@purdue.edu> Date: Tue, 22 Aug 1995 08:38:22 GMT References: <1995Aug20.114722.5649@utexas.edu> <1995Aug20.155822.8207@uni-hamburg.de> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Aug20.155822.8207@uni-hamburg.de>, fkarlsson@uni-hamburg.de (Freya Karlsson) writes: > On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. Every song on SYNTHESIS was engineered to be exactly long enough to transmit one complete telemetry frame. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Göran Reyes SupraFAXModem 28.8 @ 33,600 bps "Extraordinary claims require extraordinary spectra." From jgonzalez@purdue.edu Thu Aug 24 00:42:22 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!purdue!jgonzalez From: jgonzalez@purdue.edu (Ji-woo González) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Aug24.004222.1802@purdue.edu> Date: Thu, 24 Aug 1995 00:42:22 GMT References: <1995Aug20.114722.5649@utexas.edu> <1995Aug20.155822.8207@uni-hamburg.de> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Aug20.155822.8207@uni-hamburg.de>, fkarlsson@uni-hamburg.de (Freya Karlsson) 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. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Ji-woo González Tape trading list upon request. SASE required for international mail.