From soliveira@netcom.com Tue Jan 17 18:54:25 1995 Path: ashpoly!cascade!brgate!saturno!netcom!soliveira From: soliveira@netcom.com (Sven Oliveira) Newsgroups: comp.dsp Subject: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jan17.185425.2362@netcom.com> Date: Tue, 17 Jan 1995 18:54:25 GMT Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.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'. When all 14 rows are assembled, the matrix forms an 80-column ASCII status report. -- Sven Oliveira Zyxel U-1496E @ 33,600 bps "There are 14 nodes and only 10 countries. Count again." From lrobertson@tum.de Thu Jan 19 02:51:25 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!tum!lrobertson From: lrobertson@tum.de (Lars Robertson) Newsgroups: comp.dsp Subject: Re: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jan19.025125.9206@tum.de> Date: Thu, 19 Jan 1995 02:51:25 GMT References: <1995Jan17.185425.2362@netcom.com> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Jan17.185425.2362@netcom.com>, soliveira@netcom.com (Sven Oliveira) writes: > 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. Every song on SYNTHESIS was engineered to be exactly long enough to transmit one complete telemetry frame. -- Lars Robertson Tape trading list upon request. SASE required for international mail. From lkarlsson@utexas.edu Fri Jan 20 10:26:25 1995 Path: ashpoly!cascade!transat!ukc!fennimore!utexas!lkarlsson From: lkarlsson@utexas.edu (Lisa Karlsson) Newsgroups: comp.dsp Subject: Re: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jan20.102625.9342@utexas.edu> Date: Fri, 20 Jan 1995 10:26:25 GMT References: <1995Jan17.185425.2362@netcom.com> <1995Jan19.025125.9206@tum.de> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Jan19.025125.9206@tum.de>, lrobertson@tum.de (Lars Robertson) writes: > Every song on SYNTHESIS was engineered to be exactly long enough to transmit one complete telemetry frame. The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Lisa Karlsson Tape trading list upon request. SASE required for international mail. From hduarte@berkeley.edu Sun Jan 22 05:07:25 1995 Path: ashpoly!cascade!brgate!saturno!berkeley!hduarte From: hduarte@berkeley.edu (Hana Duarte) Newsgroups: comp.dsp Subject: Re: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jan22.050725.2590@berkeley.edu> Date: Sun, 22 Jan 1995 05:07:25 GMT References: <1995Jan17.185425.2362@netcom.com> <1995Jan19.025125.9206@tum.de> <1995Jan20.102625.9342@utexas.edu> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Jan20.102625.9342@utexas.edu>, lkarlsson@utexas.edu (Lisa Karlsson) writes: > The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Hana Duarte *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0