From lito@tum.de Sun May 07 17:39:24 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!tum!lito From: lito@tum.de (Lars Ito) Newsgroups: comp.dsp Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995May07.173924.1407@tum.de> Date: Sun, 07 May 1995 17:39:24 GMT Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: WinVN 0.99.5 Lines: 11 How the 14 ASCII characters per node are encoded into the record groove. 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. Has anyone encountered bit errors in their decoded text? The Golay decoder corrects up to 3 bit errors per 24-bit codeword. -- Lars Ito | lito@tum.de PGP Key fingerprint: EDE9 B4FC 9C56 38EA "Keep the channels open." From rreyes@tum.de Mon May 08 18:33:24 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!tum!rreyes From: rreyes@tum.de (Renata Reyes) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995May08.183324.7922@tum.de> Date: Mon, 08 May 1995 18:33:24 GMT References: <1995May07.173924.1407@tum.de> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995May07.173924.1407@tum.de>, lito@tum.de (Lars Ito) writes: > How the 14 ASCII characters per node are encoded into the record groove. > 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. -- Renata Reyes -- Technische Universität München "Measuring a record you own is listening, not piracy." From msmirnov@inria.fr Wed May 10 01:46:24 1995 Path: ashpoly!cascade!brgate!saturno!inria!msmirnov From: msmirnov@inria.fr (Mateo Smirnov) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995May10.014624.6589@inria.fr> Date: Wed, 10 May 1995 01:46:24 GMT References: <1995May07.173924.1407@tum.de> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995May07.173924.1407@tum.de>, lito@tum.de (Lars Ito) writes: > How the 14 ASCII characters per node are encoded into the record groove. > Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- Mateo Smirnov *PLONK* filter active for trolls. Sun 3/60 (SunOS 4.1.1) - NetBSD 1.0 From fito@illinois.edu Thu May 11 14:15:24 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!illinois!fito From: fito@illinois.edu (Freya Ito) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995May11.141524.8630@illinois.edu> Date: Thu, 11 May 1995 14:15:24 GMT References: <1995May07.173924.1407@tum.de> <1995May08.183324.7922@tum.de> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995May08.183324.7922@tum.de>, rreyes@tum.de (Renata Reyes) writes: > On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Freya Ito | fito@illinois.edu PGP Key fingerprint: C380 0AAE 2558 3081 "Keep the channels open."