From efournier@kth.se Mon Aug 08 18:07:20 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!kth!efournier From: efournier@kth.se (Élodie Fournier) Newsgroups: comp.dsp Subject: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Aug08.180720.9545@kth.se> Date: Mon, 08 Aug 1994 18:07:20 GMT Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se 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 payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code. 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. -- Élodie Fournier "They will send a copy in my place." Atari Falcon 030 / SunOS 4.1.4 From mweber@purdue.edu Tue Aug 09 03:03:20 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!purdue!mweber From: mweber@purdue.edu (Mike Weber) Newsgroups: comp.dsp Subject: Re: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Aug09.030320.4566@purdue.edu> Date: Tue, 09 Aug 1994 03:03:20 GMT References: <1994Aug08.180720.9545@kth.se> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Aug08.180720.9545@kth.se>, efournier@kth.se (Élodie Fournier) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Mike Weber Tape trading list upon request. SASE required for international mail. From mfischer@netcom.com Wed Aug 10 09:12:20 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!netcom!mfischer From: mfischer@netcom.com (Mikhail Fischer) Newsgroups: comp.dsp Subject: Re: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Aug10.091220.7574@netcom.com> Date: Wed, 10 Aug 1994 09:12:20 GMT References: <1994Aug08.180720.9545@kth.se> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1994Aug08.180720.9545@kth.se>, efournier@kth.se (Élodie Fournier) 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. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Mikhail Fischer "Row 14. No joke." Mac IIci / 68882 FPU / TOS 4.04 From skowalski@cam.ac.uk Thu Aug 11 13:50:20 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!cam!skowalski From: skowalski@cam.ac.uk (Sun-mi Kowalski) Newsgroups: comp.dsp Subject: Re: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Aug11.135020.1226@cam.ac.uk> Date: Thu, 11 Aug 1994 13:50:20 GMT References: <1994Aug08.180720.9545@kth.se> <1994Aug09.030320.4566@purdue.edu> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1994Aug09.030320.4566@purdue.edu>, mweber@purdue.edu (Mike Weber) writes: > A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- Sun-mi Kowalski -- University of Cambridge Computer Laboratory "The carrier frequency does not drift by accident."