From rstewart@uni-hamburg.de Fri Aug 11 05:49:37 1995 Path: ashpoly!cascade!mxgate!coyoacan!uni-hamburg!rstewart From: rstewart@uni-hamburg.de (Raj Stewart) Newsgroups: comp.dsp Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Aug11.054937.6110@uni-hamburg.de> Date: Fri, 11 Aug 1995 05:49:37 GMT Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: NewsWatcher 2.0b24 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. Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'. Has anyone encountered bit errors in their decoded text? The Golay decoder corrects up to 3 bit errors per 24-bit codeword. -- === Raj Stewart === Dept of Electrical Engineering, Universität Hamburg Fachbereich Informatik "Marcus is not one man." From bandersson@uni-hamburg.de Sat Aug 12 11:13:37 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!uni-hamburg!bandersson From: bandersson@uni-hamburg.de (Bruno Andersson) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Aug12.111337.7234@uni-hamburg.de> Date: Sat, 12 Aug 1995 11:13:37 GMT References: <1995Aug11.054937.6110@uni-hamburg.de> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Aug11.054937.6110@uni-hamburg.de>, rstewart@uni-hamburg.de (Raj Stewart) 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. -- Bruno Andersson "5 sigma is a discovery. 7 is a question." NeXTstation Turbo Color / AmigaOS 3.1 From dweber@mit.edu Mon Aug 14 01:33:37 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!mit!dweber From: dweber@mit.edu (Dmitri Weber) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Aug14.013337.6602@mit.edu> Date: Mon, 14 Aug 1995 01:33:37 GMT References: <1995Aug11.054937.6110@uni-hamburg.de> <1995Aug12.111337.7234@uni-hamburg.de> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Aug12.111337.7234@uni-hamburg.de>, bandersson@uni-hamburg.de (Bruno Andersson) writes: > On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Dmitri Weber Practical Peripherals 14.4 @ ISDN 64k bps "There are 14 nodes and only 10 countries. Count again."