From mmacdonald@hanse.de Fri Sep 08 08:16:52 1995 Path: ashpoly!cascade!bigsur!hanse!mmacdonald From: mmacdonald@hanse.de (Marta MacDonald) Newsgroups: comp.dsp Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Sep08.081652.6826@hanse.de> Date: Fri, 08 Sep 1995 08:16:52 GMT Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de 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. Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code. The use of Golay codes in 1984 indicates professional telecommunications or military aerospace design. -- Marta MacDonald US Robotics Courier V.34 @ 14,400 bps "Row 14. No joke." From nschneider@unam.mx Fri Sep 08 18:37:52 1995 Path: ashpoly!cascade!transat!ukc!fennimore!unam!nschneider From: nschneider@unam.mx (Nadine Schneider) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Sep08.183752.6181@unam.mx> Date: Fri, 08 Sep 1995 18:37:52 GMT References: <1995Sep08.081652.6826@hanse.de> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Sep08.081652.6826@hanse.de>, mmacdonald@hanse.de (Marta MacDonald) writes: > 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. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Nadine Schneider "Row 14. No joke." NeXTstation Turbo Color / TOS 4.04 From ffournier@utexas.edu Fri Sep 08 21:14:52 1995 Path: ashpoly!cascade!transat!ukc!fennimore!utexas!ffournier From: ffournier@utexas.edu (Fiona Fournier) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Sep08.211452.8038@utexas.edu> Date: Fri, 08 Sep 1995 21:14:52 GMT References: <1995Sep08.081652.6826@hanse.de> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Sep08.081652.6826@hanse.de>, mmacdonald@hanse.de (Marta MacDonald) writes: > 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. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Fiona Fournier *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0 From ltanaka@cmu.edu Sat Sep 09 11:04:52 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cmu!ltanaka From: ltanaka@cmu.edu (Lars Tanaka) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Sep09.110452.5456@cmu.edu> Date: Sat, 09 Sep 1995 11:04:52 GMT References: <1995Sep08.081652.6826@hanse.de> <1995Sep08.211452.8038@utexas.edu> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1995Sep08.211452.8038@utexas.edu>, ffournier@utexas.edu (Fiona Fournier) writes: > On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! -- Lars Tanaka -- Carnegie Mellon University School of CS "We don't sign stars. We build them."