From ptakahashi@illinois.edu Sun Apr 23 06:30:17 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!illinois!ptakahashi From: ptakahashi@illinois.edu (Pavel Takahashi) Newsgroups: comp.dsp Subject: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Apr23.063017.3447@illinois.edu> Date: Sun, 23 Apr 1995 06:30:17 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: Netscape 1.1N Lines: 10 How the 14 ASCII characters per node are encoded into the record groove. 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. -- Pavel Takahashi -- University of Illinois Urbana-Champaign "5 sigma is a discovery. 7 is a question." From tsouza@clari.net Tue Apr 25 10:26:17 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!clari!tsouza From: tsouza@clari.net (Takeshi Souza) Newsgroups: comp.dsp Subject: Re: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Apr25.102617.1186@clari.net> Date: Tue, 25 Apr 1995 10:26:17 GMT References: <1995Apr23.063017.3447@illinois.edu> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Apr23.063017.3447@illinois.edu>, ptakahashi@illinois.edu (Pavel Takahashi) writes: > How the 14 ASCII characters per node are encoded into the record groove. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Takeshi Souza "We don't sign stars. We build them." Amiga 3000T / Linux 1.2.13 From akang@hanse.de Tue Apr 25 18:15:17 1995 Path: ashpoly!cascade!bigsur!hanse!akang From: akang@hanse.de (Astrid Kang) Newsgroups: comp.dsp Subject: Re: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Apr25.181517.1050@hanse.de> Date: Tue, 25 Apr 1995 18:15:17 GMT References: <1995Apr23.063017.3447@illinois.edu> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Apr23.063017.3447@illinois.edu>, ptakahashi@illinois.edu (Pavel Takahashi) writes: > How the 14 ASCII characters per node are encoded into the record groove. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Astrid Kang *PLONK* filter active for trolls. Macintosh IIfx - NetBSD 1.0 From dvasiliev@cam.ac.uk Thu Apr 27 07:27:17 1995 Path: ashpoly!cascade!brgate!saturno!cam!dvasiliev From: dvasiliev@cam.ac.uk (Dong-hyun Vasiliev) Newsgroups: comp.dsp Subject: Re: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Apr27.072717.2935@cam.ac.uk> Date: Thu, 27 Apr 1995 07:27:17 GMT References: <1995Apr23.063017.3447@illinois.edu> <1995Apr25.181517.1050@hanse.de> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Apr25.181517.1050@hanse.de>, akang@hanse.de (Astrid Kang) 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. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Dong-hyun Vasiliev *PLONK* filter active for trolls. NeXTstation Turbo Color - NetBSD 1.0