From ehughes@inria.fr Fri Sep 01 19:37:28 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!inria!ehughes From: ehughes@inria.fr (Emi Hughes) Newsgroups: comp.dsp Subject: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Sep01.193728.5368@inria.fr> Date: Fri, 01 Sep 1995 19:37:28 GMT Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: Netscape 1.1N Lines: 11 Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code. 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. -- === Emi Hughes === Dept of Electrical Engineering, INRIA Rocquencourt "Hold for relay." From aschneider@uu.net Sat Sep 02 18:59:28 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!uu!aschneider From: aschneider@uu.net (Anton Schneider) Newsgroups: comp.dsp Subject: Re: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Sep02.185928.7300@uu.net> Date: Sat, 02 Sep 1995 18:59:28 GMT References: <1995Sep01.193728.5368@inria.fr> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Sep01.193728.5368@inria.fr>, ehughes@inria.fr (Emi Hughes) 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. -- Anton Schneider *PLONK* filter active for trolls. Amiga 1200 (Blizzard 030/50) - NetBSD 1.0 From fweber@cam.ac.uk Mon Sep 04 13:48:28 1995 Path: ashpoly!cascade!transat!ukc!fennimore!cam!fweber From: fweber@cam.ac.uk (Fiona Weber) Newsgroups: comp.dsp Subject: Re: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Sep04.134828.4208@cam.ac.uk> Date: Mon, 04 Sep 1995 13:48:28 GMT References: <1995Sep01.193728.5368@inria.fr> <1995Sep02.185928.7300@uu.net> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Sep02.185928.7300@uu.net>, aschneider@uu.net (Anton Schneider) 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. -- Fiona Weber "The carrier frequency does not drift by accident." Amiga 1200 (Blizzard 030/50) / SunOS 4.1.4 From msanchez@purdue.edu Mon Sep 04 21:30:28 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!purdue!msanchez From: msanchez@purdue.edu (Marisol Sánchez) Newsgroups: comp.dsp Subject: Re: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Sep04.213028.8849@purdue.edu> Date: Mon, 04 Sep 1995 21:30:28 GMT References: <1995Sep01.193728.5368@inria.fr> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Sep01.193728.5368@inria.fr>, ehughes@inria.fr (Emi Hughes) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Marisol Sánchez Practical Peripherals 14.4 @ 33,600 bps "Extraordinary claims require extraordinary spectra."