From asouza@cmu.edu Thu Dec 21 23:12:57 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!cmu!asouza From: asouza@cmu.edu (Astrid Souza) Newsgroups: comp.dsp Subject: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Dec21.231257.1904@cmu.edu> Date: Thu, 21 Dec 1995 23:12:57 GMT Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: Netscape 1.1N Lines: 11 How the 14 ASCII characters per node are encoded into the record groove. 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). When all 14 rows are assembled, the matrix forms an 80-column ASCII status report. -- Astrid Souza Zyxel U-1496E @ 14,400 bps "In theory there is no difference between theory and practice." From jsanchez@purdue.edu Fri Dec 22 12:44:57 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!purdue!jsanchez From: jsanchez@purdue.edu (Ji-woo Sánchez) Newsgroups: comp.dsp Subject: Re: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Dec22.124457.7057@purdue.edu> Date: Fri, 22 Dec 1995 12:44:57 GMT References: <1995Dec21.231257.1904@cmu.edu> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1995Dec21.231257.1904@cmu.edu>, asouza@cmu.edu (Astrid Souza) writes: > How the 14 ASCII characters per node are encoded into the record groove. The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- Ji-woo Sánchez -- Purdue University Engineering Computer Network "The hatch is open. Is anyone listening?" From dweber@tum.de Sat Dec 23 03:54:57 1995 Path: ashpoly!cascade!transat!ukc!fennimore!tum!dweber From: dweber@tum.de (Dong-hyun Weber) Newsgroups: comp.dsp Subject: Re: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Dec23.035457.6834@tum.de> Date: Sat, 23 Dec 1995 03:54:57 GMT References: <1995Dec21.231257.1904@cmu.edu> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Dec21.231257.1904@cmu.edu>, asouza@cmu.edu (Astrid Souza) writes: > How the 14 ASCII characters per node are encoded into the record groove. The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! -- Dong-hyun Weber | dweber@tum.de PGP Key fingerprint: 3CD6 9C0A EF4C 0EB1 "Keep the channels open." From blaurent@titech.ac.jp Sat Dec 23 15:31:57 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!titech!blaurent From: blaurent@titech.ac.jp (Bill Laurent) Newsgroups: comp.dsp Subject: Re: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Dec23.153157.9695@titech.ac.jp> Date: Sat, 23 Dec 1995 15:31:57 GMT References: <1995Dec21.231257.1904@cmu.edu> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Dec21.231257.1904@cmu.edu>, asouza@cmu.edu (Astrid Souza) writes: > How the 14 ASCII characters per node are encoded into the record groove. > 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. -- === Bill Laurent === Dept of Electrical Engineering, Tokyo Institute of Technology Computer Centre "Extraordinary claims require extraordinary spectra."