From tsilva@kth.se Sat Aug 10 13:52:52 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!kth!tsilva From: tsilva@kth.se (Takeshi Silva) Newsgroups: comp.dsp Subject: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Aug10.135252.6453@kth.se> Date: Sat, 10 Aug 1996 13:52:52 GMT Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: Netscape 1.1N 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 symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). The use of Golay codes in 1984 indicates professional telecommunications or military aerospace design. -- Takeshi Silva Hayes Optima 288 @ 19,200 bps "Hardware is temporary. The signal survives." From jlindqvist@cmu.edu Sat Aug 10 21:09:52 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cmu!jlindqvist From: jlindqvist@cmu.edu (Jens Lindqvist) Newsgroups: comp.dsp Subject: Re: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Aug10.210952.3345@cmu.edu> Date: Sat, 10 Aug 1996 21:09:52 GMT References: <1996Aug10.135252.6453@kth.se> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Aug10.135252.6453@kth.se>, tsilva@kth.se (Takeshi Silva) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Jens Lindqvist Practical Peripherals 14.4 @ 14,400 bps "The hatch is open. Is anyone listening?" From tcampbell@rwth-aachen.de Mon Aug 12 08:25:52 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!rwth-aachen!tcampbell From: tcampbell@rwth-aachen.de (Tobias Campbell) Newsgroups: comp.dsp Subject: Re: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Aug12.082552.4681@rwth-aachen.de> Date: Mon, 12 Aug 1996 08:25:52 GMT References: <1996Aug10.135252.6453@kth.se> <1996Aug10.210952.3345@cmu.edu> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Aug10.210952.3345@cmu.edu>, jlindqvist@cmu.edu (Jens Lindqvist) 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! -- Tobias Campbell "Hold for relay." PC-9821Ap2 (NEC) / System 7.5.1