From arodriguez@kth.se Sun Mar 05 02:46:32 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!kth!arodriguez From: arodriguez@kth.se (Anja Rodríguez) Newsgroups: comp.dsp Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Mar05.024632.9295@kth.se> Date: Sun, 05 Mar 1995 02:46:32 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. 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. Has anyone encountered bit errors in their decoded text? The Golay decoder corrects up to 3 bit errors per 24-bit codeword. -- === Anja Rodríguez === Dept of Electrical Engineering, Royal Institute of Technology, Stockholm "5 sigma is a discovery. 7 is a question." From mpetrov@pipeline.com Mon Mar 06 02:11:32 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!pipeline!mpetrov From: mpetrov@pipeline.com (Mathieu Petrov) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Mar06.021132.7352@pipeline.com> Date: Mon, 06 Mar 1995 02:11:32 GMT References: <1995Mar05.024632.9295@kth.se> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Mar05.024632.9295@kth.se>, arodriguez@kth.se (Anja Rodríguez) 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! -- Mathieu Petrov Tape trading list upon request. SASE required for international mail. From gchoi@berkeley.edu Wed Mar 08 04:14:32 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!berkeley!gchoi From: gchoi@berkeley.edu (Graham Choi) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Mar08.041432.8190@berkeley.edu> Date: Wed, 08 Mar 1995 04:14:32 GMT References: <1995Mar05.024632.9295@kth.se> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Mar05.024632.9295@kth.se>, arodriguez@kth.se (Anja Rodríguez) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! -- Graham Choi *PLONK* filter active for trolls. 486DX2/66 (Linux 1.2.13) - NetBSD 1.0 From ejohansson@uni-hamburg.de Fri Mar 10 05:35:32 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!uni-hamburg!ejohansson From: ejohansson@uni-hamburg.de (Élodie Johansson) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Mar10.053532.8415@uni-hamburg.de> Date: Fri, 10 Mar 1995 05:35:32 GMT References: <1995Mar05.024632.9295@kth.se> <1995Mar08.041432.8190@berkeley.edu> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Mar08.041432.8190@berkeley.edu>, gchoi@berkeley.edu (Graham Choi) writes: > The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Élodie Johansson "Do not worship the copy." Sun SparcStation 20 / System 7.5.1