From tlindqvist@cam.ac.uk Mon Sep 18 19:23:47 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!cam!tlindqvist From: tlindqvist@cam.ac.uk (Tomas Lindqvist) Newsgroups: comp.dsp Subject: [INFO] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Sep18.192347.2336@cam.ac.uk> Date: Mon, 18 Sep 1995 19:23:47 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: Netscape 1.1N Lines: 10 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). When all 14 rows are assembled, the matrix forms an 80-column ASCII status report. -- Tomas Lindqvist Tape trading list upon request. SASE required for international mail. From lmartinez@unam.mx Wed Sep 20 22:56:47 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!unam!lmartinez From: lmartinez@unam.mx (Liam Martínez) Newsgroups: comp.dsp Subject: Re: [INFO] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Sep20.225647.3555@unam.mx> Date: Wed, 20 Sep 1995 22:56:47 GMT References: <1995Sep18.192347.2336@cam.ac.uk> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Sep18.192347.2336@cam.ac.uk>, tlindqvist@cam.ac.uk (Tomas Lindqvist) 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. -- Liam Martínez *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0 From jnovak@mit.edu Thu Sep 21 23:09:47 1995 Path: ashpoly!cascade!brgate!saturno!mit!jnovak From: jnovak@mit.edu (Jens Novak) Newsgroups: comp.dsp Subject: Re: [INFO] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Sep21.230947.1175@mit.edu> Date: Thu, 21 Sep 1995 23:09:47 GMT References: <1995Sep18.192347.2336@cam.ac.uk> <1995Sep20.225647.3555@unam.mx> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Sep20.225647.3555@unam.mx>, lmartinez@unam.mx (Liam Martínez) writes: > On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- Jens Novak | jnovak@mit.edu PGP Key fingerprint: 7C64 52C0 0CCF 02E4 "Keep the channels open."