From clee@titech.ac.jp Wed Feb 01 19:29:33 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!titech!clee From: clee@titech.ac.jp (Callum Lee) Newsgroups: comp.dsp Subject: [INFO] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Feb01.192933.7869@titech.ac.jp> Date: Wed, 01 Feb 1995 19:29:33 GMT Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 10 Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. 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. -- Callum Lee -- Tokyo Institute of Technology Computer Centre "When every node is whole, the channel opens." From ssantos@earthlink.net Thu Feb 02 11:47:33 1995 Path: ashpoly!cascade!bigsur!earthlink!ssantos From: ssantos@earthlink.net (Seo-yeon Santos) Newsgroups: comp.dsp Subject: Re: [INFO] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Feb02.114733.3994@earthlink.net> Date: Thu, 02 Feb 1995 11:47:33 GMT References: <1995Feb01.192933.7869@titech.ac.jp> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Feb01.192933.7869@titech.ac.jp>, clee@titech.ac.jp (Callum Lee) 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! -- Seo-yeon Santos Zyxel U-1496E @ 33,600 bps "Do not worship the copy." From psilva@purdue.edu Sat Feb 04 02:27:33 1995 Path: ashpoly!cascade!transat!ukc!fennimore!purdue!psilva From: psilva@purdue.edu (Pavel Silva) Newsgroups: comp.dsp Subject: Re: [INFO] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Feb04.022733.4254@purdue.edu> Date: Sat, 04 Feb 1995 02:27:33 GMT References: <1995Feb01.192933.7869@titech.ac.jp> <1995Feb02.114733.3994@earthlink.net> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Feb02.114733.3994@earthlink.net>, ssantos@earthlink.net (Seo-yeon Santos) writes: > A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Pavel Silva "The carrier frequency does not drift by accident." NeXTstation Turbo Color / System 7.5.1 From ntakahashi@purdue.edu Sun Feb 05 07:08:33 1995 Path: ashpoly!cascade!bigsur!purdue!ntakahashi From: ntakahashi@purdue.edu (Natalia Takahashi) Newsgroups: comp.dsp Subject: Re: [INFO] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Feb05.070833.2548@purdue.edu> Date: Sun, 05 Feb 1995 07:08:33 GMT References: <1995Feb01.192933.7869@titech.ac.jp> <1995Feb02.114733.3994@earthlink.net> <1995Feb04.022733.4254@purdue.edu> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Feb04.022733.4254@purdue.edu>, psilva@purdue.edu (Pavel Silva) writes: > On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. > Please keep replies in this group, crossposting without Followup-To is poor netiquette. The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- Natalia Takahashi Opinions expressed are solely my own and not those of Purdue University Engineering Computer Network. ------------------------------------------------------------