From ncampbell@cam.ac.uk Sun Feb 05 15:56:35 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!cam!ncampbell From: ncampbell@cam.ac.uk (Nadia Campbell) Newsgroups: comp.dsp Subject: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Feb05.155635.1772@cam.ac.uk> Date: Sun, 05 Feb 1995 15:56:35 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk 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. Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'. When all 14 rows are assembled, the matrix forms an 80-column ASCII status report. -- Nadia Campbell *PLONK* filter active for trolls. Sun 3/60 (SunOS 4.1.1) - NetBSD 1.0 From moliveira@purdue.edu Tue Feb 07 07:44:35 1995 Path: ashpoly!cascade!mxgate!coyoacan!purdue!moliveira From: moliveira@purdue.edu (Mike Oliveira) Newsgroups: comp.dsp Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Feb07.074435.5498@purdue.edu> Date: Tue, 07 Feb 1995 07:44:35 GMT References: <1995Feb05.155635.1772@cam.ac.uk> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Feb05.155635.1772@cam.ac.uk>, ncampbell@cam.ac.uk (Nadia Campbell) 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. -- === Mike Oliveira === Dept of Electrical Engineering, Purdue University Engineering Computer Network "There are 14 nodes and only 10 countries. Count again." From mnovak@berkeley.edu Wed Feb 08 18:34:35 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!berkeley!mnovak From: mnovak@berkeley.edu (Mike Novak) Newsgroups: comp.dsp Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Feb08.183435.5452@berkeley.edu> Date: Wed, 08 Feb 1995 18:34:35 GMT References: <1995Feb05.155635.1772@cam.ac.uk> <1995Feb07.074435.5498@purdue.edu> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Feb07.074435.5498@purdue.edu>, moliveira@purdue.edu (Mike Oliveira) writes: > On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Mike Novak | mnovak@berkeley.edu PGP Key fingerprint: 62ED 5717 DF97 9EC0 "Keep the channels open." From tmartinez@cam.ac.uk Wed Feb 08 22:47:35 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!cam!tmartinez From: tmartinez@cam.ac.uk (Takeshi Martínez) Newsgroups: comp.dsp Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Feb08.224735.9234@cam.ac.uk> Date: Wed, 08 Feb 1995 22:47:35 GMT References: <1995Feb05.155635.1772@cam.ac.uk> <1995Feb07.074435.5498@purdue.edu> <1995Feb08.183435.5452@berkeley.edu> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Feb08.183435.5452@berkeley.edu>, mnovak@berkeley.edu (Mike Novak) writes: > On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! -- === Takeshi Martínez === Dept of Electrical Engineering, University of Cambridge Computer Laboratory "Do not worship the copy." From lgonzalez@rwth-aachen.de Fri Feb 10 18:53:35 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!rwth-aachen!lgonzalez From: lgonzalez@rwth-aachen.de (Lucia González) Newsgroups: comp.dsp Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Feb10.185335.3647@rwth-aachen.de> Date: Fri, 10 Feb 1995 18:53:35 GMT References: <1995Feb05.155635.1772@cam.ac.uk> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Feb05.155635.1772@cam.ac.uk>, ncampbell@cam.ac.uk (Nadia Campbell) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- Lucia González -- RWTH Aachen Informatik "Hardware is temporary. The signal survives."