From reriksson@clari.net Tue May 02 21:30:52 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!clari!reriksson From: reriksson@clari.net (Renata Eriksson) Newsgroups: comp.dsp Subject: [INFO] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995May02.213052.6477@clari.net> Date: Tue, 02 May 1995 21:30:52 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 10 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). Has anyone encountered bit errors in their decoded text? The Golay decoder corrects up to 3 bit errors per 24-bit codeword. -- Renata Eriksson -- ClariNet Communications Corp "There are 14 nodes and only 10 countries. Count again." From sgarcia@utexas.edu Thu May 04 15:04:52 1995 Path: ashpoly!cascade!bigsur!utexas!sgarcia From: sgarcia@utexas.edu (Sun-mi García) Newsgroups: comp.dsp Subject: Re: [INFO] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995May04.150452.3569@utexas.edu> Date: Thu, 04 May 1995 15:04:52 GMT References: <1995May02.213052.6477@clari.net> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995May02.213052.6477@clari.net>, reriksson@clari.net (Renata Eriksson) writes: > 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. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Sun-mi García SupraFAXModem 28.8 @ 28,800 bps "The carrier frequency does not drift by accident." From feriksson@stanford.edu Fri May 05 16:52:52 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!stanford!feriksson From: feriksson@stanford.edu (Freya Eriksson) Newsgroups: comp.dsp Subject: Re: [INFO] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995May05.165252.6269@stanford.edu> Date: Fri, 05 May 1995 16:52:52 GMT References: <1995May02.213052.6477@clari.net> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995May02.213052.6477@clari.net>, reriksson@clari.net (Renata 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. -- === Freya Eriksson === Dept of Electrical Engineering, Stanford University Computer Systems Lab "A soul is not exclusive to biology." From gchoi@u-tokyo.ac.jp Sat May 06 18:10:52 1995 Path: ashpoly!cascade!brgate!saturno!u-tokyo!gchoi From: gchoi@u-tokyo.ac.jp (Graham Choi) Newsgroups: comp.dsp Subject: Re: [INFO] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995May06.181052.6524@u-tokyo.ac.jp> Date: Sat, 06 May 1995 18:10:52 GMT References: <1995May02.213052.6477@clari.net> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995May02.213052.6477@clari.net>, reriksson@clari.net (Renata Eriksson) writes: > 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. A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- Graham Choi Tape trading list upon request. SASE required for international mail.