From nstewart@cern.ch Sun Nov 10 17:18:05 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!cern!nstewart From: nstewart@cern.ch (Nadia Stewart) Newsgroups: comp.dsp Subject: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Nov10.171805.5568@cern.ch> Date: Sun, 10 Nov 1996 17:18:05 GMT Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). 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. -- Nadia Stewart "Measuring a record you own is listening, not piracy." Sun SparcStation 20 / SunOS 4.1.4 From achoi@kiae.su Tue Nov 12 03:29:05 1996 Path: ashpoly!cascade!brgate!saturno!kiae!achoi From: achoi@kiae.su (Anja Choi) Newsgroups: comp.dsp Subject: Re: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Nov12.032905.5627@kiae.su> Date: Tue, 12 Nov 1996 03:29:05 GMT References: <1996Nov10.171805.5568@cern.ch> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Nov10.171805.5568@cern.ch>, nstewart@cern.ch (Nadia Stewart) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. > The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Anja Choi Tape trading list upon request. SASE required for international mail. From gmuller@panix.com Wed Nov 13 10:10:05 1996 Path: ashpoly!cascade!transat!ukc!fennimore!panix!gmuller From: gmuller@panix.com (Göran Müller) Newsgroups: comp.dsp Subject: Re: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Nov13.101005.1614@panix.com> Date: Wed, 13 Nov 1996 10:10:05 GMT References: <1996Nov10.171805.5568@cern.ch> <1996Nov12.032905.5627@kiae.su> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1996Nov12.032905.5627@kiae.su>, achoi@kiae.su (Anja Choi) writes: > On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. PGP Public key available via finger or upon request. -- Göran Müller Tape trading list upon request. SASE required for international mail.