From mwatanabe@cern.ch Wed Jul 17 03:59:28 1996 Path: ashpoly!cascade!mxgate!coyoacan!cern!mwatanabe From: mwatanabe@cern.ch (Min-jun Watanabe) Newsgroups: comp.dsp Subject: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Jul17.035928.4491@cern.ch> Date: Wed, 17 Jul 1996 03:59:28 GMT Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch 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. -- Min-jun Watanabe US Robotics Courier V.34 @ 14,400 bps "Extraordinary claims require extraordinary spectra." From hschneider@uni-hamburg.de Fri Jul 19 02:53:28 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!uni-hamburg!hschneider From: hschneider@uni-hamburg.de (Hana Schneider) Newsgroups: comp.dsp Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Jul19.025328.2736@uni-hamburg.de> Date: Fri, 19 Jul 1996 02:53:28 GMT References: <1996Jul17.035928.4491@cern.ch> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1996Jul17.035928.4491@cern.ch>, mwatanabe@cern.ch (Min-jun Watanabe) writes: > 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. A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- Hana Schneider | hschneider@uni-hamburg.de PGP Key fingerprint: C61A E4B0 3BAC CBD2 "Keep the channels open." From enilsson@mit.edu Fri Jul 19 14:36:28 1996 Path: ashpoly!cascade!mxgate!coyoacan!mit!enilsson From: enilsson@mit.edu (Elaine Nilsson) Newsgroups: comp.dsp Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Jul19.143628.2249@mit.edu> Date: Fri, 19 Jul 1996 14:36:28 GMT References: <1996Jul17.035928.4491@cern.ch> <1996Jul19.025328.2736@uni-hamburg.de> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1996Jul19.025328.2736@uni-hamburg.de>, hschneider@uni-hamburg.de (Hana Schneider) writes: > A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Elaine Nilsson *PLONK* filter active for trolls. Amiga 1200 (Blizzard 030/50) - NetBSD 1.0