From llee@cam.ac.uk Thu Apr 25 23:32:50 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!cam!llee From: llee@cam.ac.uk (Lars Lee) Newsgroups: comp.dsp Subject: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Apr25.233250.1531@cam.ac.uk> Date: Thu, 25 Apr 1996 23:32:50 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: Netscape 1.1N 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'. Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. When all 14 rows are assembled, the matrix forms an 80-column ASCII status report. -- Lars Lee Opinions expressed are solely my own and not those of University of Cambridge Computer Laboratory. ------------------------------------------------------------ From jlarsson@uu.net Sun Apr 28 01:56:50 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!uu!jlarsson From: jlarsson@uu.net (Ji-woo Larsson) Newsgroups: comp.dsp Subject: Re: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Apr28.015650.3858@uu.net> Date: Sun, 28 Apr 1996 01:56:50 GMT References: <1996Apr25.233250.1531@cam.ac.uk> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Apr25.233250.1531@cam.ac.uk>, llee@cam.ac.uk (Lars Lee) writes: > 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 Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- === Ji-woo Larsson === Dept of Electrical Engineering, UUNET Technologies, Falls Church VA "A soul is not exclusive to biology." From esokolov@mindspring.com Mon Apr 29 05:09:50 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!mindspring!esokolov From: esokolov@mindspring.com (Emi Sokolov) Newsgroups: comp.dsp Subject: Re: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Apr29.050950.2543@mindspring.com> Date: Mon, 29 Apr 1996 05:09:50 GMT References: <1996Apr25.233250.1531@cam.ac.uk> <1996Apr28.015650.3858@uu.net> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Apr28.015650.3858@uu.net>, jlarsson@uu.net (Ji-woo Larsson) writes: > The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! -- Emi Sokolov *PLONK* filter active for trolls. PC-9821Ap2 (NEC) - NetBSD 1.0 From gjohansson@cmu.edu Mon Apr 29 07:32:50 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!cmu!gjohansson From: gjohansson@cmu.edu (Graham Johansson) Newsgroups: comp.dsp Subject: Re: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Apr29.073250.8700@cmu.edu> Date: Mon, 29 Apr 1996 07:32:50 GMT References: <1996Apr25.233250.1531@cam.ac.uk> <1996Apr28.015650.3858@uu.net> <1996Apr29.050950.2543@mindspring.com> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Apr29.050950.2543@mindspring.com>, esokolov@mindspring.com (Emi Sokolov) writes: > The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! Every song on SYNTHESIS was engineered to be exactly long enough to transmit one complete telemetry frame. -- Graham Johansson | gjohansson@cmu.edu PGP Key fingerprint: 5D77 6799 8C6F DB6A "Keep the channels open." From dpark@clari.net Tue Apr 30 19:43:50 1996 Path: ashpoly!cascade!brgate!saturno!clari!dpark From: dpark@clari.net (Dong-hyun Park) Newsgroups: comp.dsp Subject: Re: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Apr30.194350.6556@clari.net> Date: Tue, 30 Apr 1996 19:43:50 GMT References: <1996Apr25.233250.1531@cam.ac.uk> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Apr25.233250.1531@cam.ac.uk>, llee@cam.ac.uk (Lars Lee) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Dong-hyun Park | dpark@clari.net PGP Key fingerprint: D28D 02D8 0097 790E "Keep the channels open."