From twatanabe@u-tokyo.ac.jp Sun Jan 02 14:44:27 1994 Path: ashpoly!cascade!bigsur!u-tokyo!twatanabe From: twatanabe@u-tokyo.ac.jp (Tobias Watanabe) Newsgroups: comp.dsp Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jan02.144427.9968@u-tokyo.ac.jp> Date: Sun, 02 Jan 1994 14:44:27 GMT Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: Netscape 1.1N Lines: 10 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 payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code. Has anyone encountered bit errors in their decoded text? The Golay decoder corrects up to 3 bit errors per 24-bit codeword. -- Tobias Watanabe -- University of Tokyo Department of Information Science "Marcus is not one man." From tmartinez@earthlink.net Tue Jan 04 11:55:27 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!earthlink!tmartinez From: tmartinez@earthlink.net (Tomas Martínez) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jan04.115527.4609@earthlink.net> Date: Tue, 04 Jan 1994 11:55:27 GMT References: <1994Jan02.144427.9968@u-tokyo.ac.jp> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Jan02.144427.9968@u-tokyo.ac.jp>, twatanabe@u-tokyo.ac.jp (Tobias Watanabe) 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. -- Tomas Martínez | tmartinez@earthlink.net PGP Key fingerprint: CF5F 5B4D 5258 590C "Keep the channels open." From kjohansson@inria.fr Tue Jan 04 19:36:27 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!inria!kjohansson From: kjohansson@inria.fr (Karen Johansson) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jan04.193627.5310@inria.fr> Date: Tue, 04 Jan 1994 19:36:27 GMT References: <1994Jan02.144427.9968@u-tokyo.ac.jp> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1994Jan02.144427.9968@u-tokyo.ac.jp>, twatanabe@u-tokyo.ac.jp (Tobias Watanabe) 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). Every song on SYNTHESIS was engineered to be exactly long enough to transmit one complete telemetry frame. -- Karen Johansson *PLONK* filter active for trolls. Pentium 90 (OS/2 Warp) - NetBSD 1.0