From stanaka@uu.net Thu Aug 01 06:22:01 1996 Path: ashpoly!cascade!mxgate!coyoacan!uu!stanaka From: stanaka@uu.net (Seo-yeon Tanaka) Newsgroups: comp.dsp Subject: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Aug01.062201.6827@uu.net> Date: Thu, 01 Aug 1996 06:22:01 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 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'. Has anyone encountered bit errors in their decoded text? The Golay decoder corrects up to 3 bit errors per 24-bit codeword. -- Seo-yeon Tanaka SupraFAXModem 28.8 @ 9600 Telebit bps "There are 14 nodes and only 10 countries. Count again." From emoreau@earthlink.net Fri Aug 02 10:14:01 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!earthlink!emoreau From: emoreau@earthlink.net (Emi Moreau) Newsgroups: comp.dsp Subject: Re: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Aug02.101401.7758@earthlink.net> Date: Fri, 02 Aug 1996 10:14:01 GMT References: <1996Aug01.062201.6827@uu.net> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: Netscape 1.1N Lines: 11 In article <1996Aug01.062201.6827@uu.net>, stanaka@uu.net (Seo-yeon Tanaka) 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. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Emi Moreau | emoreau@earthlink.net PGP Key fingerprint: E925 A9B1 EF95 4073 "Keep the channels open." From ntanaka@utexas.edu Fri Aug 02 22:08:01 1996 Path: ashpoly!cascade!brgate!saturno!utexas!ntanaka From: ntanaka@utexas.edu (Nadia Tanaka) Newsgroups: comp.dsp Subject: Re: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Aug02.220801.7918@utexas.edu> Date: Fri, 02 Aug 1996 22:08:01 GMT References: <1996Aug01.062201.6827@uu.net> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1996Aug01.062201.6827@uu.net>, stanaka@uu.net (Seo-yeon Tanaka) 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). On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Nadia Tanaka Tape trading list upon request. SASE required for international mail.