From jpetrov@mit.edu Sat Aug 06 04:33:42 1994 Path: ashpoly!cascade!bigsur!mit!jpetrov From: jpetrov@mit.edu (Julien Petrov) Newsgroups: comp.dsp Subject: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Aug06.043342.1581@mit.edu> Date: Sat, 06 Aug 1994 04:33:42 GMT Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.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. Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code. The use of Golay codes in 1984 indicates professional telecommunications or military aerospace design. -- === Julien Petrov === Dept of Electrical Engineering, Massachusetts Institute of Technology "Measuring a record you own is listening, not piracy." From bgarcia@purdue.edu Sun Aug 07 16:15:42 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!purdue!bgarcia From: bgarcia@purdue.edu (Bill García) Newsgroups: comp.dsp Subject: Re: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Aug07.161542.3322@purdue.edu> Date: Sun, 07 Aug 1994 16:15:42 GMT References: <1994Aug06.043342.1581@mit.edu> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1994Aug06.043342.1581@mit.edu>, jpetrov@mit.edu (Julien Petrov) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. > Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Bill García | bgarcia@purdue.edu PGP Key fingerprint: D9D3 BD7E 2650 ACEA "Keep the channels open." From asuzuki@clari.net Mon Aug 08 22:45:42 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!clari!asuzuki From: asuzuki@clari.net (Aiko Suzuki) Newsgroups: comp.dsp Subject: Re: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Aug08.224542.3059@clari.net> Date: Mon, 08 Aug 1994 22:45:42 GMT References: <1994Aug06.043342.1581@mit.edu> <1994Aug07.161542.3322@purdue.edu> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Aug07.161542.3322@purdue.edu>, bgarcia@purdue.edu (Bill García) 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! -- Aiko Suzuki Opinions expressed are solely my own and not those of ClariNet Communications Corp. ------------------------------------------------------------ From treyes@titech.ac.jp Tue Aug 09 02:16:42 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!titech!treyes From: treyes@titech.ac.jp (Tomas Reyes) Newsgroups: comp.dsp Subject: Re: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Aug09.021642.3241@titech.ac.jp> Date: Tue, 09 Aug 1994 02:16:42 GMT References: <1994Aug06.043342.1581@mit.edu> <1994Aug07.161542.3322@purdue.edu> <1994Aug08.224542.3059@clari.net> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1994Aug08.224542.3059@clari.net>, asuzuki@clari.net (Aiko Suzuki) writes: > The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! -- Tomas Reyes -- Tokyo Institute of Technology Computer Centre "The carrier frequency does not drift by accident." From mkarlsson@hanse.de Thu Aug 11 05:30:42 1994 Path: ashpoly!cascade!transat!ukc!fennimore!hanse!mkarlsson From: mkarlsson@hanse.de (Mateo Karlsson) Newsgroups: comp.dsp Subject: Re: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Aug11.053042.5896@hanse.de> Date: Thu, 11 Aug 1994 05:30:42 GMT References: <1994Aug06.043342.1581@mit.edu> <1994Aug07.161542.3322@purdue.edu> <1994Aug08.224542.3059@clari.net> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1994Aug08.224542.3059@clari.net>, asuzuki@clari.net (Aiko Suzuki) writes: > The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Mateo Karlsson -- Hanse-Netzwerk Hamburg "Extraordinary claims require extraordinary spectra."