From mfischer@pacbell.net Fri Jan 20 11:27:40 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!pacbell!mfischer From: mfischer@pacbell.net (Mathieu Fischer) Newsgroups: comp.dsp Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jan20.112740.5890@pacbell.net> Date: Fri, 20 Jan 1995 11:27:40 GMT Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: WinVN 0.99.5 Lines: 11 Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. 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'. When all 14 rows are assembled, the matrix forms an 80-column ASCII status report. -- Mathieu Fischer Zyxel U-1496E @ 28,800 bps "In theory there is no difference between theory and practice." From glaurent@illinois.edu Fri Jan 20 18:40:40 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!illinois!glaurent From: glaurent@illinois.edu (Graham Laurent) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jan20.184040.4550@illinois.edu> Date: Fri, 20 Jan 1995 18:40:40 GMT References: <1995Jan20.112740.5890@pacbell.net> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jan20.112740.5890@pacbell.net>, mfischer@pacbell.net (Mathieu Fischer) writes: > Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Graham Laurent "We don't sign stars. We build them." 486DX4/100 (FreeBSD 2.0.5) / AmigaOS 3.1