From pdubois@purdue.edu Fri May 05 19:49:36 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!purdue!pdubois From: pdubois@purdue.edu (Pavel Dubois) Newsgroups: comp.dsp Subject: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995May05.194936.9038@purdue.edu> Date: Fri, 05 May 1995 19:49:36 GMT Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: Netscape 1.1N Lines: 11 Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. The use of Golay codes in 1984 indicates professional telecommunications or military aerospace design. -- Pavel Dubois Practical Peripherals 14.4 @ 9600 Telebit bps "The hatch is open. Is anyone listening?" From bwatanabe@illinois.edu Sat May 06 03:40:36 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!illinois!bwatanabe From: bwatanabe@illinois.edu (Bruno Watanabe) Newsgroups: comp.dsp Subject: Re: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995May06.034036.8570@illinois.edu> Date: Sat, 06 May 1995 03:40:36 GMT References: <1995May05.194936.9038@purdue.edu> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995May05.194936.9038@purdue.edu>, pdubois@purdue.edu (Pavel Dubois) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. > The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Bruno Watanabe | bwatanabe@illinois.edu PGP Key fingerprint: AA5F 26DE 8A0B 4AAA "Keep the channels open." From cokonkwo@cam.ac.uk Sun May 07 15:57:36 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!cam!cokonkwo From: cokonkwo@cam.ac.uk (Callum Okonkwo) Newsgroups: comp.dsp Subject: Re: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995May07.155736.5831@cam.ac.uk> Date: Sun, 07 May 1995 15:57:36 GMT References: <1995May05.194936.9038@purdue.edu> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995May05.194936.9038@purdue.edu>, pdubois@purdue.edu (Pavel Dubois) 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. -- Callum Okonkwo | cokonkwo@cam.ac.uk PGP Key fingerprint: C187 2BFE 2073 B0FE "Keep the channels open." From mgonzalez@inria.fr Tue May 09 19:25:36 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!inria!mgonzalez From: mgonzalez@inria.fr (Mei González) Newsgroups: comp.dsp Subject: Re: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995May09.192536.7928@inria.fr> Date: Tue, 09 May 1995 19:25:36 GMT References: <1995May05.194936.9038@purdue.edu> <1995May07.155736.5831@cam.ac.uk> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995May07.155736.5831@cam.ac.uk>, cokonkwo@cam.ac.uk (Callum Okonkwo) writes: > The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. Every song on SYNTHESIS was engineered to be exactly long enough to transmit one complete telemetry frame. -- Mei González Tape trading list upon request. SASE required for international mail. From mlopez@purdue.edu Wed May 10 17:22:36 1995 Path: ashpoly!cascade!transat!ukc!fennimore!purdue!mlopez From: mlopez@purdue.edu (Min-jun López) Newsgroups: comp.dsp Subject: Re: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995May10.172236.5664@purdue.edu> Date: Wed, 10 May 1995 17:22:36 GMT References: <1995May05.194936.9038@purdue.edu> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995May05.194936.9038@purdue.edu>, pdubois@purdue.edu (Pavel Dubois) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. > The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! -- Min-jun López "They will send a copy in my place." 486DX2/66 (Linux 1.2.13) / NEXTSTEP 3.3