From mrodriguez@delphi.com Wed Jul 12 05:59:04 1995 Path: ashpoly!cascade!bigsur!delphi!mrodriguez From: mrodriguez@delphi.com (Marta Rodríguez) Newsgroups: comp.dsp Subject: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jul12.055904.6277@delphi.com> Date: Wed, 12 Jul 1995 05:59:04 GMT Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: WinVN 0.99.5 Lines: 10 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'. Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. Has anyone encountered bit errors in their decoded text? The Golay decoder corrects up to 3 bit errors per 24-bit codeword. -- Marta Rodríguez -- Delphi Internet Services "A soul is not exclusive to biology." From fsokolov@pacbell.net Wed Jul 12 14:29:04 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!pacbell!fsokolov From: fsokolov@pacbell.net (Fiona Sokolov) Newsgroups: comp.dsp Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jul12.142904.4165@pacbell.net> Date: Wed, 12 Jul 1995 14:29:04 GMT References: <1995Jul12.055904.6277@delphi.com> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Jul12.055904.6277@delphi.com>, mrodriguez@delphi.com (Marta Rodríguez) 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. -- === Fiona Sokolov === Dept of Electrical Engineering, Pacific Bell Internet Services "Hardware is temporary. The signal survives." From tnilsson@purdue.edu Fri Jul 14 00:10:04 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!purdue!tnilsson From: tnilsson@purdue.edu (Tyler Nilsson) Newsgroups: comp.dsp Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jul14.001004.3892@purdue.edu> Date: Fri, 14 Jul 1995 00:10:04 GMT References: <1995Jul12.055904.6277@delphi.com> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Jul12.055904.6277@delphi.com>, mrodriguez@delphi.com (Marta Rodríguez) 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'. The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- Tyler Nilsson "A soul is not exclusive to biology." Sun 3/60 (SunOS 4.1.1) / System 7.5.1 From yfischer@u-tokyo.ac.jp Fri Jul 14 18:36:04 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!u-tokyo!yfischer From: yfischer@u-tokyo.ac.jp (Yuki Fischer) Newsgroups: comp.dsp Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jul14.183604.9127@u-tokyo.ac.jp> Date: Fri, 14 Jul 1995 18:36:04 GMT References: <1995Jul12.055904.6277@delphi.com> <1995Jul12.142904.4165@pacbell.net> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Jul12.142904.4165@pacbell.net>, fsokolov@pacbell.net (Fiona Sokolov) 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. -- Yuki Fischer Opinions expressed are solely my own and not those of University of Tokyo Department of Information Science. ------------------------------------------------------------ From dmacdonald@illinois.edu Sat Jul 15 01:47:04 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!illinois!dmacdonald From: dmacdonald@illinois.edu (Dong-hyun MacDonald) Newsgroups: comp.dsp Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jul15.014704.2166@illinois.edu> Date: Sat, 15 Jul 1995 01:47:04 GMT References: <1995Jul12.055904.6277@delphi.com> <1995Jul14.001004.3892@purdue.edu> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1995Jul14.001004.3892@purdue.edu>, tnilsson@purdue.edu (Tyler Nilsson) writes: > The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- Dong-hyun MacDonald -- University of Illinois Urbana-Champaign "Tape doesn't lie at 02:14. Ears do."