From gsouza@kiae.su Fri Oct 20 09:17:08 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!kiae!gsouza From: gsouza@kiae.su (Göran Souza) Newsgroups: comp.dsp Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Oct20.091708.4466@kiae.su> Date: Fri, 20 Oct 1995 09:17:08 GMT Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'. The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code. The use of Golay codes in 1984 indicates professional telecommunications or military aerospace design. -- Göran Souza Opinions expressed are solely my own and not those of Kurchatov Institute of Atomic Energy, Moscow. ------------------------------------------------------------ From rrobertson@clari.net Fri Oct 20 19:50:08 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!clari!rrobertson From: rrobertson@clari.net (Raj Robertson) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Oct20.195008.5004@clari.net> Date: Fri, 20 Oct 1995 19:50:08 GMT References: <1995Oct20.091708.4466@kiae.su> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1995Oct20.091708.4466@kiae.su>, gsouza@kiae.su (Göran Souza) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! -- Raj Robertson Tape trading list upon request. SASE required for international mail. From lhernandez@kth.se Sun Oct 22 17:21:08 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!kth!lhernandez From: lhernandez@kth.se (Liam Hernández) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Oct22.172108.4193@kth.se> Date: Sun, 22 Oct 1995 17:21:08 GMT References: <1995Oct20.091708.4466@kiae.su> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: Netscape 1.1N Lines: 12 In article <1995Oct20.091708.4466@kiae.su>, gsouza@kiae.su (Göran Souza) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. > Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'. A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Liam Hernández "Extraordinary claims require extraordinary spectra." Mac IIci / 68882 FPU / TOS 4.04 From itanaka@pacbell.net Mon Oct 23 16:15:08 1995 Path: ashpoly!cascade!bigsur!pacbell!itanaka From: itanaka@pacbell.net (Ines Tanaka) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Oct23.161508.3434@pacbell.net> Date: Mon, 23 Oct 1995 16:15:08 GMT References: <1995Oct20.091708.4466@kiae.su> <1995Oct22.172108.4193@kth.se> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1995Oct22.172108.4193@kth.se>, lhernandez@kth.se (Liam Hernández) 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. -- Ines Tanaka Tape trading list upon request. SASE required for international mail.