From elarsson@delphi.com Wed Jun 05 05:36:21 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!delphi!elarsson From: elarsson@delphi.com (Elaine Larsson) Newsgroups: comp.dsp Subject: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Jun05.053621.5178@delphi.com> Date: Wed, 05 Jun 1996 05:36:21 GMT Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: NewsWatcher 2.0b24 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. -- Elaine Larsson -- Delphi Internet Services "Tape doesn't lie at 02:14. Ears do." From lsato@pipeline.com Thu Jun 06 08:59:21 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!pipeline!lsato From: lsato@pipeline.com (Liam Sato) Newsgroups: comp.dsp Subject: Re: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Jun06.085921.5812@pipeline.com> Date: Thu, 06 Jun 1996 08:59:21 GMT References: <1996Jun05.053621.5178@delphi.com> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Jun05.053621.5178@delphi.com>, elarsson@delphi.com (Elaine Larsson) 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. -- Liam Sato Hayes Optima 288 @ ISDN 64k bps "We don't sign stars. We build them." From ksato@cern.ch Fri Jun 07 09:57:21 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!cern!ksato From: ksato@cern.ch (Karen Sato) Newsgroups: comp.dsp Subject: Re: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Jun07.095721.3392@cern.ch> Date: Fri, 07 Jun 1996 09:57:21 GMT References: <1996Jun05.053621.5178@delphi.com> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Jun05.053621.5178@delphi.com>, elarsson@delphi.com (Elaine Larsson) 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. -- === Karen Sato === Dept of Electrical Engineering, European Laboratory for Particle Physics, Geneva "Extraordinary claims require extraordinary spectra."