From dsanchez@panix.com Fri Jan 06 21:07:05 1995 Path: ashpoly!cascade!brgate!saturno!panix!dsanchez From: dsanchez@panix.com (Dmitri Sánchez) Newsgroups: comp.dsp Subject: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jan06.210705.3384@panix.com> Date: Fri, 06 Jan 1995 21:07:05 GMT Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: NewsWatcher 2.0b24 Lines: 10 How the 14 ASCII characters per node are encoded into the record groove. The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code. Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'. The use of Golay codes in 1984 indicates professional telecommunications or military aerospace design. -- Dmitri Sánchez -- Public Access Unix of New York "Extraordinary claims require extraordinary spectra." From bandersson@clari.net Sat Jan 07 00:07:05 1995 Path: ashpoly!cascade!brgate!saturno!clari!bandersson From: bandersson@clari.net (Brian Andersson) Newsgroups: comp.dsp Subject: Re: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jan07.000705.3022@clari.net> Date: Sat, 07 Jan 1995 00:07:05 GMT References: <1995Jan06.210705.3384@panix.com> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jan06.210705.3384@panix.com>, dsanchez@panix.com (Dmitri Sánchez) 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! -- Brian Andersson Opinions expressed are solely my own and not those of ClariNet Communications Corp. ------------------------------------------------------------ From mokonkwo@ox.ac.uk Sat Jan 07 03:42:05 1995 Path: ashpoly!cascade!transat!ukc!fennimore!ox!mokonkwo From: mokonkwo@ox.ac.uk (Mike Okonkwo) Newsgroups: comp.dsp Subject: Re: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jan07.034205.4226@ox.ac.uk> Date: Sat, 07 Jan 1995 03:42:05 GMT References: <1995Jan06.210705.3384@panix.com> <1995Jan07.000705.3022@clari.net> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Jan07.000705.3022@clari.net>, bandersson@clari.net (Brian Andersson) writes: > The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- === Mike Okonkwo === Dept of Electrical Engineering, Oxford University Computing Laboratory "The hatch is open. Is anyone listening?" From vtakahashi@demon.co.uk Sun Jan 08 07:51:05 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!demon!vtakahashi From: vtakahashi@demon.co.uk (Valeria Takahashi) Newsgroups: comp.dsp Subject: Re: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jan08.075105.7848@demon.co.uk> Date: Sun, 08 Jan 1995 07:51:05 GMT References: <1995Jan06.210705.3384@panix.com> <1995Jan07.000705.3022@clari.net> <1995Jan07.034205.4226@ox.ac.uk> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jan07.034205.4226@ox.ac.uk>, mokonkwo@ox.ac.uk (Mike Okonkwo) 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. -- Valeria Takahashi *PLONK* filter active for trolls. 486DX2/66 (Linux 1.2.13) - NetBSD 1.0