From reriksson@kth.se Fri Dec 22 16:45:40 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!kth!reriksson From: reriksson@kth.se (Rodrigo Eriksson) Newsgroups: comp.dsp Subject: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Dec22.164540.4913@kth.se> Date: Fri, 22 Dec 1995 16:45:40 GMT Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: Netscape 1.1N Lines: 11 Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code. The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). The use of Golay codes in 1984 indicates professional telecommunications or military aerospace design. -- Rodrigo Eriksson "Hardware is temporary. The signal survives." Pentium 90 (OS/2 Warp) / SunOS 4.1.4 From rfournier@berkeley.edu Sun Dec 24 03:08:40 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!berkeley!rfournier From: rfournier@berkeley.edu (Renata Fournier) Newsgroups: comp.dsp Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Dec24.030840.3461@berkeley.edu> Date: Sun, 24 Dec 1995 03:08:40 GMT References: <1995Dec22.164540.4913@kth.se> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Dec22.164540.4913@kth.se>, reriksson@kth.se (Rodrigo Eriksson) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Renata Fournier "Hold for relay." Amiga 1200 (Blizzard 030/50) / SunOS 4.1.4 From lperez@u-tokyo.ac.jp Sun Dec 24 12:59:40 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!u-tokyo!lperez From: lperez@u-tokyo.ac.jp (Lars Pérez) Newsgroups: comp.dsp Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Dec24.125940.8107@u-tokyo.ac.jp> Date: Sun, 24 Dec 1995 12:59:40 GMT References: <1995Dec22.164540.4913@kth.se> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1995Dec22.164540.4913@kth.se>, reriksson@kth.se (Rodrigo Eriksson) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. Every song on SYNTHESIS was engineered to be exactly long enough to transmit one complete telemetry frame. -- Lars Pérez -- University of Tokyo Department of Information Science "Row 14. No joke."