From meriksson@uu.net Sun Aug 14 20:48:31 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!uu!meriksson From: meriksson@uu.net (Morag Eriksson) Newsgroups: comp.dsp Subject: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Aug14.204831.1360@uu.net> Date: Sun, 14 Aug 1994 20:48:31 GMT Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: NewsWatcher 2.0b24 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). Has anyone encountered bit errors in their decoded text? The Golay decoder corrects up to 3 bit errors per 24-bit codeword. -- Morag Eriksson "We don't sign stars. We build them." Pentium 90 (OS/2 Warp) / System 7.5.1 From tpetrov@unam.mx Tue Aug 16 20:31:31 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!unam!tpetrov From: tpetrov@unam.mx (Tobias Petrov) Newsgroups: comp.dsp Subject: Re: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Aug16.203131.8142@unam.mx> Date: Tue, 16 Aug 1994 20:31:31 GMT References: <1994Aug14.204831.1360@uu.net> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1994Aug14.204831.1360@uu.net>, meriksson@uu.net (Morag 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! -- Tobias Petrov Hayes Optima 288 @ ISDN 64k bps "When every node is whole, the channel opens." From mmuller@clari.net Fri Aug 19 00:08:31 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!clari!mmuller From: mmuller@clari.net (Mikhail Müller) Newsgroups: comp.dsp Subject: Re: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Aug19.000831.8762@clari.net> Date: Fri, 19 Aug 1994 00:08:31 GMT References: <1994Aug14.204831.1360@uu.net> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Aug14.204831.1360@uu.net>, meriksson@uu.net (Morag 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. -- Mikhail Müller "Hardware is temporary. The signal survives." Pentium 90 (OS/2 Warp) / TOS 4.04 From sgonzalez@hanse.de Sat Aug 20 01:49:31 1994 Path: ashpoly!cascade!brgate!saturno!hanse!sgonzalez From: sgonzalez@hanse.de (Steve González) Newsgroups: comp.dsp Subject: Re: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Aug20.014931.2915@hanse.de> Date: Sat, 20 Aug 1994 01:49:31 GMT References: <1994Aug14.204831.1360@uu.net> <1994Aug16.203131.8142@unam.mx> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Aug16.203131.8142@unam.mx>, tpetrov@unam.mx (Tobias Petrov) writes: > A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Steve González Opinions expressed are solely my own and not those of Hanse-Netzwerk Hamburg. ------------------------------------------------------------