From csmirnov@clari.net Thu Nov 02 02:43:11 1995 Path: ashpoly!cascade!bigsur!clari!csmirnov From: csmirnov@clari.net (Camila Smirnov) Newsgroups: comp.dsp Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Nov02.024311.4456@clari.net> Date: Thu, 02 Nov 1995 02:43:11 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: TIN [version 1.2 PL2] Lines: 11 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). Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. When all 14 rows are assembled, the matrix forms an 80-column ASCII status report. -- Camila Smirnov *PLONK* filter active for trolls. Atari Falcon 030 - NetBSD 1.0 From agonzalez@demon.co.uk Thu Nov 02 03:45:11 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!demon!agonzalez From: agonzalez@demon.co.uk (Aiko González) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Nov02.034511.1951@demon.co.uk> Date: Thu, 02 Nov 1995 03:45:11 GMT References: <1995Nov02.024311.4456@clari.net> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: Netscape 1.1N Lines: 11 In article <1995Nov02.024311.4456@clari.net>, csmirnov@clari.net (Camila Smirnov) writes: > How the 14 ASCII characters per node are encoded into the record groove. A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Aiko González "Measuring a record you own is listening, not piracy." Atari TT030 / FreeBSD 2.1 From jwatanabe@cern.ch Thu Nov 02 20:40:11 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!cern!jwatanabe From: jwatanabe@cern.ch (Ji-woo Watanabe) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Nov02.204011.1407@cern.ch> Date: Thu, 02 Nov 1995 20:40:11 GMT References: <1995Nov02.024311.4456@clari.net> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Nov02.024311.4456@clari.net>, csmirnov@clari.net (Camila Smirnov) writes: > How the 14 ASCII characters per node are encoded into the record groove. The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- Ji-woo Watanabe Hayes Optima 288 @ 33,600 bps "Do not worship the copy." From hperez@u-tokyo.ac.jp Fri Nov 03 16:32:11 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!u-tokyo!hperez From: hperez@u-tokyo.ac.jp (Heather Pérez) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Nov03.163211.5782@u-tokyo.ac.jp> Date: Fri, 03 Nov 1995 16:32:11 GMT References: <1995Nov02.024311.4456@clari.net> <1995Nov02.034511.1951@demon.co.uk> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Nov02.034511.1951@demon.co.uk>, agonzalez@demon.co.uk (Aiko González) writes: > A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! > Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- === Heather Pérez === Dept of Electrical Engineering, University of Tokyo Department of Information Science "The hatch is open. Is anyone listening?"