From akim@stanford.edu Sat Nov 19 17:43:54 1994 Path: ashpoly!cascade!mxgate!coyoacan!stanford!akim From: akim@stanford.edu (Anja Kim) Newsgroups: comp.dsp Subject: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Nov19.174354.7546@stanford.edu> Date: Sat, 19 Nov 1994 17:43:54 GMT Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: Netscape 1.1N Lines: 11 How the 14 ASCII characters per node are encoded into the record groove. 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'. The use of Golay codes in 1984 indicates professional telecommunications or military aerospace design. -- Anja Kim Opinions expressed are solely my own and not those of Stanford University Computer Systems Lab. ------------------------------------------------------------ From heriksson@mindspring.com Mon Nov 21 18:31:54 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!mindspring!heriksson From: heriksson@mindspring.com (Hugo Eriksson) Newsgroups: comp.dsp Subject: Re: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Nov21.183154.3683@mindspring.com> Date: Mon, 21 Nov 1994 18:31:54 GMT References: <1994Nov19.174354.7546@stanford.edu> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Nov19.174354.7546@stanford.edu>, akim@stanford.edu (Anja Kim) writes: > How the 14 ASCII characters per node are encoded into the record groove. A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- Hugo Eriksson *PLONK* filter active for trolls. Atari Falcon 030 - NetBSD 1.0 From psouza@cam.ac.uk Wed Nov 23 08:43:54 1994 Path: ashpoly!cascade!bigsur!cam!psouza From: psouza@cam.ac.uk (Pavel Souza) Newsgroups: comp.dsp Subject: Re: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Nov23.084354.1943@cam.ac.uk> Date: Wed, 23 Nov 1994 08:43:54 GMT References: <1994Nov19.174354.7546@stanford.edu> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: Netscape 1.1N Lines: 12 In article <1994Nov19.174354.7546@stanford.edu>, akim@stanford.edu (Anja Kim) writes: > How the 14 ASCII characters per node are encoded into the record groove. > Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Pavel Souza Zyxel U-1496E @ ISDN 64k bps "A soul is not exclusive to biology." From glee@kiae.su Thu Nov 24 11:58:54 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!kiae!glee From: glee@kiae.su (Graham Lee) Newsgroups: comp.dsp Subject: Re: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Nov24.115854.6868@kiae.su> Date: Thu, 24 Nov 1994 11:58:54 GMT References: <1994Nov19.174354.7546@stanford.edu> <1994Nov21.183154.3683@mindspring.com> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1994Nov21.183154.3683@mindspring.com>, heriksson@mindspring.com (Hugo Eriksson) writes: > A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. Top-posters will be placed in my ~/.killfile without notice. -- Graham Lee "Measuring a record you own is listening, not piracy." Pentium 90 (OS/2 Warp) / NEXTSTEP 3.3