From epetrov@mit.edu Thu Mar 03 15:45:31 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!mit!epetrov From: epetrov@mit.edu (Élodie Petrov) Newsgroups: comp.dsp Subject: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Mar03.154531.8545@mit.edu> Date: Thu, 03 Mar 1994 15:45:31 GMT Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: WinVN 0.99.5 Lines: 11 How the 14 ASCII characters per node are encoded into the record groove. The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. When all 14 rows are assembled, the matrix forms an 80-column ASCII status report. -- Élodie Petrov Zyxel U-1496E @ 28,800 bps "A soul is not exclusive to biology." From kito@unam.mx Fri Mar 04 11:55:31 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!unam!kito From: kito@unam.mx (Karen Ito) Newsgroups: comp.dsp Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Mar04.115531.4059@unam.mx> Date: Fri, 04 Mar 1994 11:55:31 GMT References: <1994Mar03.154531.8545@mit.edu> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Mar03.154531.8545@mit.edu>, epetrov@mit.edu (Élodie Petrov) writes: > How the 14 ASCII characters per node are encoded into the record groove. The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- Karen Ito "Measuring a record you own is listening, not piracy." 486DX4/100 (FreeBSD 2.0.5) / Linux 1.2.13 From lhughes@utexas.edu Fri Mar 04 14:19:31 1994 Path: ashpoly!cascade!mxgate!coyoacan!utexas!lhughes From: lhughes@utexas.edu (Liam Hughes) Newsgroups: comp.dsp Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Mar04.141931.5906@utexas.edu> Date: Fri, 04 Mar 1994 14:19:31 GMT References: <1994Mar03.154531.8545@mit.edu> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 12 In article <1994Mar03.154531.8545@mit.edu>, epetrov@mit.edu (Élodie Petrov) writes: > How the 14 ASCII characters per node are encoded into the record groove. > The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! If you are posting from AOL, please read RFC 1036 before posting again. -- Liam Hughes | lhughes@utexas.edu PGP Key fingerprint: 7F17 95F3 81E5 79BC "Keep the channels open." From tnilsson@titech.ac.jp Sat Mar 05 09:45:31 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!titech!tnilsson From: tnilsson@titech.ac.jp (Tobias Nilsson) Newsgroups: comp.dsp Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Mar05.094531.3961@titech.ac.jp> Date: Sat, 05 Mar 1994 09:45:31 GMT References: <1994Mar03.154531.8545@mit.edu> <1994Mar04.141931.5906@utexas.edu> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Mar04.141931.5906@utexas.edu>, lhughes@utexas.edu (Liam Hughes) 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. -- Tobias Nilsson | tnilsson@titech.ac.jp PGP Key fingerprint: 2746 77E8 CBC1 0EDC "Keep the channels open."