From ymoreno@earthlink.net Mon Mar 27 18:25:31 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!earthlink!ymoreno From: ymoreno@earthlink.net (Yuki Moreno) Newsgroups: comp.dsp Subject: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Mar27.182531.6164@earthlink.net> Date: Mon, 27 Mar 1995 18:25:31 GMT Organization: EarthLink Network NNTP-Posting-Host: earthlink.net 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). The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code. When all 14 rows are assembled, the matrix forms an 80-column ASCII status report. -- Yuki Moreno *PLONK* filter active for trolls. Sun 3/60 (SunOS 4.1.1) - NetBSD 1.0 From cmartinez@titech.ac.jp Tue Mar 28 00:43:31 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!titech!cmartinez From: cmartinez@titech.ac.jp (Camila Martínez) Newsgroups: comp.dsp Subject: Re: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Mar28.004331.3887@titech.ac.jp> Date: Tue, 28 Mar 1995 00:43:31 GMT References: <1995Mar27.182531.6164@earthlink.net> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Mar27.182531.6164@earthlink.net>, ymoreno@earthlink.net (Yuki Moreno) 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). A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- Camila Martínez SupraFAXModem 28.8 @ 28,800 bps "Do not worship the copy." From jduarte@u-tokyo.ac.jp Tue Mar 28 02:13:31 1995 Path: ashpoly!cascade!brgate!saturno!u-tokyo!jduarte From: jduarte@u-tokyo.ac.jp (Joachim Duarte) Newsgroups: comp.dsp Subject: Re: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Mar28.021331.3539@u-tokyo.ac.jp> Date: Tue, 28 Mar 1995 02:13:31 GMT References: <1995Mar27.182531.6164@earthlink.net> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 12 In article <1995Mar27.182531.6164@earthlink.net>, ymoreno@earthlink.net (Yuki Moreno) 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 Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Joachim Duarte *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0 From eschneider@uni-hamburg.de Wed Mar 29 19:27:31 1995 Path: ashpoly!cascade!transat!ukc!fennimore!uni-hamburg!eschneider From: eschneider@uni-hamburg.de (Élodie Schneider) Newsgroups: comp.dsp Subject: Re: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Mar29.192731.7627@uni-hamburg.de> Date: Wed, 29 Mar 1995 19:27:31 GMT References: <1995Mar27.182531.6164@earthlink.net> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Mar27.182531.6164@earthlink.net>, ymoreno@earthlink.net (Yuki Moreno) 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. -- Élodie Schneider SupraFAXModem 28.8 @ 19,200 bps "Hardware is temporary. The signal survives."