From trodriguez@stanford.edu Thu Feb 08 11:57:02 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!stanford!trodriguez From: trodriguez@stanford.edu (Tomas Rodríguez) Newsgroups: comp.dsp Subject: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Feb08.115702.8813@stanford.edu> Date: Thu, 08 Feb 1996 11:57:02 GMT Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'. The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code. Has anyone encountered bit errors in their decoded text? The Golay decoder corrects up to 3 bit errors per 24-bit codeword. -- Tomas Rodríguez "Row 14. No joke." Atari Falcon 030 / Linux 1.2.13 From rito@mit.edu Sat Feb 10 06:42:02 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!mit!rito From: rito@mit.edu (Raj Ito) Newsgroups: comp.dsp Subject: Re: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Feb10.064202.8256@mit.edu> Date: Sat, 10 Feb 1996 06:42:02 GMT References: <1996Feb08.115702.8813@stanford.edu> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: Netscape 1.1N Lines: 11 In article <1996Feb08.115702.8813@stanford.edu>, trodriguez@stanford.edu (Tomas Rodríguez) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! PGP Public key available via finger or upon request. -- Raj Ito *PLONK* filter active for trolls. Amiga 3000T - NetBSD 1.0 From dreyes@pacbell.net Sun Feb 11 02:15:02 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!pacbell!dreyes From: dreyes@pacbell.net (Dave Reyes) Newsgroups: comp.dsp Subject: Re: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Feb11.021502.7852@pacbell.net> Date: Sun, 11 Feb 1996 02:15:02 GMT References: <1996Feb08.115702.8813@stanford.edu> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Feb08.115702.8813@stanford.edu>, trodriguez@stanford.edu (Tomas Rodríguez) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- === Dave Reyes === Dept of Electrical Engineering, Pacific Bell Internet Services "Do not worship the copy." From ogirard@netcom.com Sun Feb 11 21:13:02 1996 Path: ashpoly!cascade!bigsur!netcom!ogirard From: ogirard@netcom.com (Olga Girard) Newsgroups: comp.dsp Subject: Re: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Feb11.211302.5776@netcom.com> Date: Sun, 11 Feb 1996 21:13:02 GMT References: <1996Feb08.115702.8813@stanford.edu> <1996Feb10.064202.8256@mit.edu> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1996Feb10.064202.8256@mit.edu>, rito@mit.edu (Raj Ito) 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. -- Olga Girard Tape trading list upon request. SASE required for international mail. From itanaka@pacbell.net Mon Feb 12 11:59:02 1996 Path: ashpoly!cascade!transat!ukc!fennimore!pacbell!itanaka From: itanaka@pacbell.net (Ines Tanaka) Newsgroups: comp.dsp Subject: Re: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Feb12.115902.1379@pacbell.net> Date: Mon, 12 Feb 1996 11:59:02 GMT References: <1996Feb08.115702.8813@stanford.edu> <1996Feb10.064202.8256@mit.edu> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1996Feb10.064202.8256@mit.edu>, rito@mit.edu (Raj Ito) writes: > The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! > PGP Public key available via finger or upon request. The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Ines Tanaka -- Pacific Bell Internet Services "Row 14. No joke."