From hjohansson@cam.ac.uk Wed Sep 18 16:12:35 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cam!hjohansson From: hjohansson@cam.ac.uk (Hugo Johansson) Newsgroups: comp.dsp Subject: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Sep18.161235.8491@cam.ac.uk> Date: Wed, 18 Sep 1996 16:12:35 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'. The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). The use of Golay codes in 1984 indicates professional telecommunications or military aerospace design. -- Hugo Johansson "The hatch is open. Is anyone listening?" Amiga 1200 (Blizzard 030/50) / TOS 4.04 From ilaurent@panix.com Thu Sep 19 05:50:35 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!panix!ilaurent From: ilaurent@panix.com (Ines Laurent) Newsgroups: comp.dsp Subject: Re: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Sep19.055035.8170@panix.com> Date: Thu, 19 Sep 1996 05:50:35 GMT References: <1996Sep18.161235.8491@cam.ac.uk> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1996Sep18.161235.8491@cam.ac.uk>, hjohansson@cam.ac.uk (Hugo Johansson) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. > Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Ines Laurent *PLONK* filter active for trolls. Decstation 5000/200 - NetBSD 1.0