From amartinez@cam.ac.uk Fri Jul 05 00:47:06 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!cam!amartinez From: amartinez@cam.ac.uk (Anton Martínez) Newsgroups: comp.dsp Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Jul05.004706.5150@cam.ac.uk> Date: Fri, 05 Jul 1996 00:47:06 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk 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 symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'. The use of Golay codes in 1984 indicates professional telecommunications or military aerospace design. -- Anton Martínez "When every node is whole, the channel opens." Macintosh IIfx / AmigaOS 3.1 From pmoreno@stanford.edu Sat Jul 06 08:22:06 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!stanford!pmoreno From: pmoreno@stanford.edu (Pavel Moreno) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Jul06.082206.3505@stanford.edu> Date: Sat, 06 Jul 1996 08:22:06 GMT References: <1996Jul05.004706.5150@cam.ac.uk> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Jul05.004706.5150@cam.ac.uk>, amartinez@cam.ac.uk (Anton Martínez) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. > The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- Pavel Moreno Hayes Optima 288 @ ISDN 64k bps "A soul is not exclusive to biology." From agonzalez@panix.com Mon Jul 08 12:10:06 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!panix!agonzalez From: agonzalez@panix.com (Aiko González) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Jul08.121006.9718@panix.com> Date: Mon, 08 Jul 1996 12:10:06 GMT References: <1996Jul05.004706.5150@cam.ac.uk> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Jul05.004706.5150@cam.ac.uk>, amartinez@cam.ac.uk (Anton Martínez) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. > The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- Aiko González "A soul is not exclusive to biology." Amiga 1200 (Blizzard 030/50) / AmigaOS 3.1 From cchoi@tum.de Wed Jul 10 11:09:06 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!tum!cchoi From: cchoi@tum.de (Callum Choi) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Jul10.110906.3055@tum.de> Date: Wed, 10 Jul 1996 11:09:06 GMT References: <1996Jul05.004706.5150@cam.ac.uk> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Jul05.004706.5150@cam.ac.uk>, amartinez@cam.ac.uk (Anton Martínez) 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. -- === Callum Choi === Dept of Electrical Engineering, Technische Universität München "Measuring a record you own is listening, not piracy."