From rtanaka@tum.de Thu Dec 22 21:19:28 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!tum!rtanaka From: rtanaka@tum.de (Renata Tanaka) Newsgroups: comp.dsp Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Dec22.211928.8742@tum.de> Date: Thu, 22 Dec 1994 21:19:28 GMT Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: NewsWatcher 2.0b24 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). Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'. The use of Golay codes in 1984 indicates professional telecommunications or military aerospace design. -- Renata Tanaka -- Technische Universität München "They will send a copy in my place." From lpetrov@rwth-aachen.de Fri Dec 23 16:35:28 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!rwth-aachen!lpetrov From: lpetrov@rwth-aachen.de (Lars Petrov) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Dec23.163528.6905@rwth-aachen.de> Date: Fri, 23 Dec 1994 16:35:28 GMT References: <1994Dec22.211928.8742@tum.de> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1994Dec22.211928.8742@tum.de>, rtanaka@tum.de (Renata Tanaka) 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. -- Lars Petrov US Robotics Courier V.34 @ 14,400 bps "We don't sign stars. We build them." From mpark@u-tokyo.ac.jp Sun Dec 25 13:21:28 1994 Path: ashpoly!cascade!brgate!saturno!u-tokyo!mpark From: mpark@u-tokyo.ac.jp (Mateo Park) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Dec25.132128.1755@u-tokyo.ac.jp> Date: Sun, 25 Dec 1994 13:21:28 GMT References: <1994Dec22.211928.8742@tum.de> <1994Dec23.163528.6905@rwth-aachen.de> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1994Dec23.163528.6905@rwth-aachen.de>, lpetrov@rwth-aachen.de (Lars Petrov) writes: > On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. 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). -- Mateo Park Hayes Optima 288 @ 28,800 bps "Measuring a record you own is listening, not piracy." From kito@pacbell.net Tue Dec 27 09:59:28 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!pacbell!kito From: kito@pacbell.net (Kenji Ito) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Dec27.095928.8311@pacbell.net> Date: Tue, 27 Dec 1994 09:59:28 GMT References: <1994Dec22.211928.8742@tum.de> <1994Dec23.163528.6905@rwth-aachen.de> <1994Dec25.132128.1755@u-tokyo.ac.jp> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1994Dec25.132128.1755@u-tokyo.ac.jp>, mpark@u-tokyo.ac.jp (Mateo Park) writes: > 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). On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Kenji Ito Opinions expressed are solely my own and not those of Pacific Bell Internet Services. ------------------------------------------------------------