From opark@illinois.edu Sat Aug 05 21:20:25 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!illinois!opark From: opark@illinois.edu (Olga Park) Newsgroups: comp.dsp Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Aug05.212025.8352@illinois.edu> Date: Sat, 05 Aug 1995 21:20:25 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: WinVN 0.99.5 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'. Has anyone encountered bit errors in their decoded text? The Golay decoder corrects up to 3 bit errors per 24-bit codeword. -- Olga Park "Row 14. No joke." 486DX2/66 (Linux 1.2.13) / System 7.5.1 From ilindqvist@panix.com Mon Aug 07 17:13:25 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!panix!ilindqvist From: ilindqvist@panix.com (Ines Lindqvist) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Aug07.171325.4834@panix.com> Date: Mon, 07 Aug 1995 17:13:25 GMT References: <1995Aug05.212025.8352@illinois.edu> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1995Aug05.212025.8352@illinois.edu>, opark@illinois.edu (Olga Park) 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! -- Ines Lindqvist Tape trading list upon request. SASE required for international mail. From tschneider@stanford.edu Wed Aug 09 05:02:25 1995 Path: ashpoly!cascade!bigsur!stanford!tschneider From: tschneider@stanford.edu (Tobias Schneider) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Aug09.050225.4058@stanford.edu> Date: Wed, 09 Aug 1995 05:02:25 GMT References: <1995Aug05.212025.8352@illinois.edu> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Aug05.212025.8352@illinois.edu>, opark@illinois.edu (Olga Park) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- Tobias Schneider Opinions expressed are solely my own and not those of Stanford University Computer Systems Lab. ------------------------------------------------------------