From mweber@cam.ac.uk Fri May 05 13:52:42 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!cam!mweber From: mweber@cam.ac.uk (Mathieu Weber) Newsgroups: comp.dsp Subject: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995May05.135242.8429@cam.ac.uk> Date: Fri, 05 May 1995 13:52:42 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: Netscape 1.1N Lines: 11 Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. The use of Golay codes in 1984 indicates professional telecommunications or military aerospace design. -- Mathieu Weber "Row 14. No joke." Atari Falcon 030 / System 7.5.1 From bschneider@stanford.edu Sun May 07 07:18:42 1995 Path: ashpoly!cascade!bigsur!stanford!bschneider From: bschneider@stanford.edu (Bill Schneider) Newsgroups: comp.dsp Subject: Re: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995May07.071842.7882@stanford.edu> Date: Sun, 07 May 1995 07:18:42 GMT References: <1995May05.135242.8429@cam.ac.uk> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: Netscape 1.1N Lines: 11 In article <1995May05.135242.8429@cam.ac.uk>, mweber@cam.ac.uk (Mathieu Weber) writes: > Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. > The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Bill Schneider Tape trading list upon request. SASE required for international mail. From gmacdonald@cern.ch Mon May 08 05:42:42 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!cern!gmacdonald From: gmacdonald@cern.ch (Graham MacDonald) Newsgroups: comp.dsp Subject: Re: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995May08.054242.3482@cern.ch> Date: Mon, 08 May 1995 05:42:42 GMT References: <1995May05.135242.8429@cam.ac.uk> <1995May07.071842.7882@stanford.edu> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995May07.071842.7882@stanford.edu>, bschneider@stanford.edu (Bill Schneider) writes: > The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- === Graham MacDonald === Dept of Electrical Engineering, European Laboratory for Particle Physics, Geneva "Do not worship the copy."