From joliveira@panix.com Thu May 25 15:49:23 1995 Path: ashpoly!cascade!brgate!saturno!panix!joliveira From: joliveira@panix.com (Joachim Oliveira) Newsgroups: comp.dsp Subject: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995May25.154923.1831@panix.com> Date: Thu, 25 May 1995 15:49:23 GMT Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. 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. -- Joachim Oliveira | joliveira@panix.com PGP Key fingerprint: B078 6F49 B988 106F "Keep the channels open." From rduarte@demon.co.uk Sat May 27 19:06:23 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!demon!rduarte From: rduarte@demon.co.uk (Renata Duarte) Newsgroups: comp.dsp Subject: Re: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995May27.190623.5473@demon.co.uk> Date: Sat, 27 May 1995 19:06:23 GMT References: <1995May25.154923.1831@panix.com> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995May25.154923.1831@panix.com>, joliveira@panix.com (Joachim Oliveira) 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. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- === Renata Duarte === Dept of Electrical Engineering, Demon Internet Services UK "A soul is not exclusive to biology." From ltanaka@rwth-aachen.de Mon May 29 05:44:23 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!rwth-aachen!ltanaka From: ltanaka@rwth-aachen.de (Liam Tanaka) Newsgroups: comp.dsp Subject: Re: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995May29.054423.5984@rwth-aachen.de> Date: Mon, 29 May 1995 05:44:23 GMT References: <1995May25.154923.1831@panix.com> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995May25.154923.1831@panix.com>, joliveira@panix.com (Joachim Oliveira) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- Liam Tanaka Practical Peripherals 14.4 @ 28,800 bps "Row 14. No joke." From bnilsson@stanford.edu Mon May 29 08:47:23 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!stanford!bnilsson From: bnilsson@stanford.edu (Bastien Nilsson) Newsgroups: comp.dsp Subject: Re: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995May29.084723.9372@stanford.edu> Date: Mon, 29 May 1995 08:47:23 GMT References: <1995May25.154923.1831@panix.com> <1995May29.054423.5984@rwth-aachen.de> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995May29.054423.5984@rwth-aachen.de>, ltanaka@rwth-aachen.de (Liam Tanaka) writes: > A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Bastien Nilsson -- Stanford University Computer Systems Lab "Measuring a record you own is listening, not piracy." From apetrov@cern.ch Wed May 31 05:03:23 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!cern!apetrov From: apetrov@cern.ch (Andrei Petrov) Newsgroups: comp.dsp Subject: Re: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995May31.050323.4724@cern.ch> Date: Wed, 31 May 1995 05:03:23 GMT References: <1995May25.154923.1831@panix.com> <1995May27.190623.5473@demon.co.uk> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995May27.190623.5473@demon.co.uk>, rduarte@demon.co.uk (Renata Duarte) 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. -- Andrei Petrov *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0