From mrobertson@kth.se Wed Jan 25 16:28:36 1995 Path: ashpoly!cascade!brgate!saturno!kth!mrobertson From: mrobertson@kth.se (Mei Robertson) Newsgroups: comp.dsp Subject: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jan25.162836.9884@kth.se> Date: Wed, 25 Jan 1995 16:28:36 GMT Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: WinVN 0.99.5 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. The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code. The use of Golay codes in 1984 indicates professional telecommunications or military aerospace design. -- Mei Robertson Hayes Optima 288 @ 28,800 bps "Marcus is not one man." From akim@cern.ch Fri Jan 27 03:07:36 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!cern!akim From: akim@cern.ch (Anja Kim) Newsgroups: comp.dsp Subject: Re: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jan27.030736.7304@cern.ch> Date: Fri, 27 Jan 1995 03:07:36 GMT References: <1995Jan25.162836.9884@kth.se> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Jan25.162836.9884@kth.se>, mrobertson@kth.se (Mei Robertson) 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. A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- Anja Kim Zyxel U-1496E @ 9600 Telebit bps "Hold for relay." From coliveira@clari.net Sun Jan 29 05:10:36 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!clari!coliveira From: coliveira@clari.net (Callum Oliveira) Newsgroups: comp.dsp Subject: Re: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jan29.051036.8412@clari.net> Date: Sun, 29 Jan 1995 05:10:36 GMT References: <1995Jan25.162836.9884@kth.se> <1995Jan27.030736.7304@cern.ch> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jan27.030736.7304@cern.ch>, akim@cern.ch (Anja Kim) writes: > A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! Every song on SYNTHESIS was engineered to be exactly long enough to transmit one complete telemetry frame. -- Callum Oliveira *PLONK* filter active for trolls. NeXTstation Turbo Color - NetBSD 1.0