From mgarcia@purdue.edu Wed Jan 03 23:38:36 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!purdue!mgarcia From: mgarcia@purdue.edu (Matthias García) Newsgroups: comp.dsp Subject: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Jan03.233836.4851@purdue.edu> Date: Wed, 03 Jan 1996 23:38:36 GMT Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: Netscape 1.1N Lines: 10 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 symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). When all 14 rows are assembled, the matrix forms an 80-column ASCII status report. -- Matthias García Tape trading list upon request. SASE required for international mail. From asmirnov@panix.com Thu Jan 04 09:17:36 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!panix!asmirnov From: asmirnov@panix.com (Anja Smirnov) Newsgroups: comp.dsp Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Jan04.091736.5305@panix.com> Date: Thu, 04 Jan 1996 09:17:36 GMT References: <1996Jan03.233836.4851@purdue.edu> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Jan03.233836.4851@purdue.edu>, mgarcia@purdue.edu (Matthias García) 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. -- Anja Smirnov "We don't sign stars. We build them." Macintosh IIfx / System 7.5.1 From msokolov@clari.net Fri Jan 05 12:32:36 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!clari!msokolov From: msokolov@clari.net (Marta Sokolov) Newsgroups: comp.dsp Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Jan05.123236.6950@clari.net> Date: Fri, 05 Jan 1996 12:32:36 GMT References: <1996Jan03.233836.4851@purdue.edu> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1996Jan03.233836.4851@purdue.edu>, mgarcia@purdue.edu (Matthias García) 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. The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- Marta Sokolov *PLONK* filter active for trolls. PC-9821Ap2 (NEC) - NetBSD 1.0 From dlindqvist@cmu.edu Sat Jan 06 09:59:36 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cmu!dlindqvist From: dlindqvist@cmu.edu (Dmitri Lindqvist) Newsgroups: comp.dsp Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Jan06.095936.8966@cmu.edu> Date: Sat, 06 Jan 1996 09:59:36 GMT References: <1996Jan03.233836.4851@purdue.edu> <1996Jan05.123236.6950@clari.net> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1996Jan05.123236.6950@clari.net>, msokolov@clari.net (Marta Sokolov) 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. -- Dmitri Lindqvist -- Carnegie Mellon University School of CS "In theory there is no difference between theory and practice."