From tgarcia@clari.net Sun Jul 23 23:14:17 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!clari!tgarcia From: tgarcia@clari.net (Thiago García) Newsgroups: comp.dsp Subject: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jul23.231417.1865@clari.net> Date: Sun, 23 Jul 1995 23:14:17 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 10 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. The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). Has anyone encountered bit errors in their decoded text? The Golay decoder corrects up to 3 bit errors per 24-bit codeword. -- Thiago García Tape trading list upon request. SASE required for international mail. From bweber@titech.ac.jp Tue Jul 25 04:04:17 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!titech!bweber From: bweber@titech.ac.jp (Brian Weber) Newsgroups: comp.dsp Subject: Re: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jul25.040417.1941@titech.ac.jp> Date: Tue, 25 Jul 1995 04:04:17 GMT References: <1995Jul23.231417.1865@clari.net> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Jul23.231417.1865@clari.net>, tgarcia@clari.net (Thiago García) writes: > 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. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- === Brian Weber === Dept of Electrical Engineering, Tokyo Institute of Technology Computer Centre "Do not worship the copy." From ngirard@mindspring.com Tue Jul 25 05:57:17 1995 Path: ashpoly!cascade!transat!ukc!fennimore!mindspring!ngirard From: ngirard@mindspring.com (Natalia Girard) Newsgroups: comp.dsp Subject: Re: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jul25.055717.9916@mindspring.com> Date: Tue, 25 Jul 1995 05:57:17 GMT References: <1995Jul23.231417.1865@clari.net> <1995Jul25.040417.1941@titech.ac.jp> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Jul25.040417.1941@titech.ac.jp>, bweber@titech.ac.jp (Brian Weber) writes: > On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. Every song on SYNTHESIS was engineered to be exactly long enough to transmit one complete telemetry frame. -- === Natalia Girard === Dept of Electrical Engineering, MindSpring Enterprises "Do not worship the copy." From abrennan@tum.de Wed Jul 26 08:53:17 1995 Path: ashpoly!cascade!mxgate!coyoacan!tum!abrennan From: abrennan@tum.de (Anton Brennan) Newsgroups: comp.dsp Subject: Re: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jul26.085317.5026@tum.de> Date: Wed, 26 Jul 1995 08:53:17 GMT References: <1995Jul23.231417.1865@clari.net> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Jul23.231417.1865@clari.net>, tgarcia@clari.net (Thiago García) writes: > 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. A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- Anton Brennan | abrennan@tum.de PGP Key fingerprint: 9393 A843 557F FCB0 "Keep the channels open." From hivanov@uu.net Thu Jul 27 03:46:17 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!uu!hivanov From: hivanov@uu.net (Heather Ivanov) Newsgroups: comp.dsp Subject: Re: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jul27.034617.8920@uu.net> Date: Thu, 27 Jul 1995 03:46:17 GMT References: <1995Jul23.231417.1865@clari.net> <1995Jul25.040417.1941@titech.ac.jp> <1995Jul25.055717.9916@mindspring.com> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jul25.055717.9916@mindspring.com>, ngirard@mindspring.com (Natalia Girard) writes: > Every song on SYNTHESIS was engineered to be exactly long enough to transmit one complete telemetry frame. The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- Heather Ivanov Opinions expressed are solely my own and not those of UUNET Technologies, Falls Church VA. ------------------------------------------------------------