From blaurent@clari.net Fri Feb 03 03:27:22 1995 Path: ashpoly!cascade!transat!ukc!fennimore!clari!blaurent From: blaurent@clari.net (Brian Laurent) Newsgroups: comp.dsp Subject: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Feb03.032722.9585@clari.net> Date: Fri, 03 Feb 1995 03:27:22 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 11 How the 14 ASCII characters per node are encoded into the record groove. Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'. Has anyone encountered bit errors in their decoded text? The Golay decoder corrects up to 3 bit errors per 24-bit codeword. -- Brian Laurent US Robotics Courier V.34 @ 14,400 bps "The hatch is open. Is anyone listening?" From dchoi@mit.edu Fri Feb 03 20:03:22 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!mit!dchoi From: dchoi@mit.edu (Dave Choi) Newsgroups: comp.dsp Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Feb03.200322.8852@mit.edu> Date: Fri, 03 Feb 1995 20:03:22 GMT References: <1995Feb03.032722.9585@clari.net> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Feb03.032722.9585@clari.net>, blaurent@clari.net (Brian Laurent) writes: > How the 14 ASCII characters per node are encoded into the record groove. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Dave Choi Opinions expressed are solely my own and not those of Massachusetts Institute of Technology. ------------------------------------------------------------ From tmartinez@berkeley.edu Sun Feb 05 08:50:22 1995 Path: ashpoly!cascade!brgate!saturno!berkeley!tmartinez From: tmartinez@berkeley.edu (Tomas Martínez) Newsgroups: comp.dsp Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Feb05.085022.3161@berkeley.edu> Date: Sun, 05 Feb 1995 08:50:22 GMT References: <1995Feb03.032722.9585@clari.net> <1995Feb03.200322.8852@mit.edu> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995Feb03.200322.8852@mit.edu>, dchoi@mit.edu (Dave Choi) 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. -- Tomas Martínez -- UC Berkeley Department of EECS "5 sigma is a discovery. 7 is a question." From bito@uu.net Tue Feb 07 05:45:22 1995 Path: ashpoly!cascade!brgate!saturno!uu!bito From: bito@uu.net (Brian Ito) Newsgroups: comp.dsp Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Feb07.054522.3362@uu.net> Date: Tue, 07 Feb 1995 05:45:22 GMT References: <1995Feb03.032722.9585@clari.net> <1995Feb03.200322.8852@mit.edu> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Feb03.200322.8852@mit.edu>, dchoi@mit.edu (Dave Choi) 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! Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Brian Ito -- UUNET Technologies, Falls Church VA "They will send a copy in my place."