From tlaurent@purdue.edu Tue Oct 10 22:26:39 1995 Path: ashpoly!cascade!mxgate!coyoacan!purdue!tlaurent From: tlaurent@purdue.edu (Tyler Laurent) Newsgroups: comp.dsp Subject: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Oct10.222639.1274@purdue.edu> Date: Tue, 10 Oct 1995 22:26:39 GMT Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: WinVN 0.99.5 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. -- Tyler Laurent *PLONK* filter active for trolls. PC-9821Ap2 (NEC) - NetBSD 1.0 From lcampbell@panix.com Thu Oct 12 22:51:39 1995 Path: ashpoly!cascade!brgate!saturno!panix!lcampbell From: lcampbell@panix.com (Lisa Campbell) Newsgroups: comp.dsp Subject: Re: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Oct12.225139.4835@panix.com> Date: Thu, 12 Oct 1995 22:51:39 GMT References: <1995Oct10.222639.1274@purdue.edu> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1995Oct10.222639.1274@purdue.edu>, tlaurent@purdue.edu (Tyler Laurent) 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! Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Lisa Campbell | lcampbell@panix.com PGP Key fingerprint: 9375 95D4 EE61 84B8 "Keep the channels open." From ypark@kth.se Fri Oct 13 07:12:39 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!kth!ypark From: ypark@kth.se (Yuki Park) Newsgroups: comp.dsp Subject: Re: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Oct13.071239.8580@kth.se> Date: Fri, 13 Oct 1995 07:12:39 GMT References: <1995Oct10.222639.1274@purdue.edu> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Oct10.222639.1274@purdue.edu>, tlaurent@purdue.edu (Tyler Laurent) 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! -- Yuki Park Opinions expressed are solely my own and not those of Royal Institute of Technology, Stockholm. ------------------------------------------------------------ From mhernandez@illinois.edu Sat Oct 14 00:16:39 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!illinois!mhernandez From: mhernandez@illinois.edu (Mathieu Hernández) Newsgroups: comp.dsp Subject: Re: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Oct14.001639.8259@illinois.edu> Date: Sat, 14 Oct 1995 00:16:39 GMT References: <1995Oct10.222639.1274@purdue.edu> <1995Oct13.071239.8580@kth.se> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Oct13.071239.8580@kth.se>, ypark@kth.se (Yuki Park) writes: > A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- Mathieu Hernández *PLONK* filter active for trolls. Mac IIci / 68882 FPU - NetBSD 1.0 From msanchez@uni-hamburg.de Sat Oct 14 20:39:39 1995 Path: ashpoly!cascade!transat!ukc!fennimore!uni-hamburg!msanchez From: msanchez@uni-hamburg.de (Marisol Sánchez) Newsgroups: comp.dsp Subject: Re: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Oct14.203939.7615@uni-hamburg.de> Date: Sat, 14 Oct 1995 20:39:39 GMT References: <1995Oct10.222639.1274@purdue.edu> <1995Oct13.071239.8580@kth.se> <1995Oct14.001639.8259@illinois.edu> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Oct14.001639.8259@illinois.edu>, mhernandez@illinois.edu (Mathieu Hernández) writes: > The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. Every song on SYNTHESIS was engineered to be exactly long enough to transmit one complete telemetry frame. -- Marisol Sánchez Zyxel U-1496E @ 33,600 bps "When every node is whole, the channel opens."