From dsilva@clari.net Mon Mar 06 00:53:41 1995 Path: ashpoly!cascade!brgate!saturno!clari!dsilva From: dsilva@clari.net (Dave Silva) Newsgroups: comp.dsp Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Mar06.005341.5011@clari.net> Date: Mon, 06 Mar 1995 00:53:41 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: Netscape 1.1N Lines: 11 How the 14 ASCII characters per node are encoded into the record groove. The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). 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. -- === Dave Silva === Dept of Electrical Engineering, ClariNet Communications Corp "They will send a copy in my place." From jtakahashi@pacbell.net Tue Mar 07 13:16:41 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!pacbell!jtakahashi From: jtakahashi@pacbell.net (Jens Takahashi) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Mar07.131641.2065@pacbell.net> Date: Tue, 07 Mar 1995 13:16:41 GMT References: <1995Mar06.005341.5011@clari.net> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Mar06.005341.5011@clari.net>, dsilva@clari.net (Dave Silva) writes: > How the 14 ASCII characters per node are encoded into the record groove. > 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! -- Jens Takahashi | jtakahashi@pacbell.net PGP Key fingerprint: 3AB6 2429 D06A 17C4 "Keep the channels open." From alopez@stanford.edu Wed Mar 08 01:19:41 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!stanford!alopez From: alopez@stanford.edu (Amy López) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Mar08.011941.9734@stanford.edu> Date: Wed, 08 Mar 1995 01:19:41 GMT References: <1995Mar06.005341.5011@clari.net> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Mar06.005341.5011@clari.net>, dsilva@clari.net (Dave Silva) writes: > How the 14 ASCII characters per node are encoded into the record groove. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Amy López *PLONK* filter active for trolls. Decstation 5000/200 - NetBSD 1.0 From vsuzuki@uu.net Thu Mar 09 07:50:41 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!uu!vsuzuki From: vsuzuki@uu.net (Valeria Suzuki) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Mar09.075041.7163@uu.net> Date: Thu, 09 Mar 1995 07:50:41 GMT References: <1995Mar06.005341.5011@clari.net> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Mar06.005341.5011@clari.net>, dsilva@clari.net (Dave Silva) writes: > How the 14 ASCII characters per node are encoded into the record groove. > 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! -- Valeria Suzuki *PLONK* filter active for trolls. NeXTstation Turbo Color - NetBSD 1.0 From tlopez@panix.com Fri Mar 10 16:54:41 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!panix!tlopez From: tlopez@panix.com (Tyler López) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Mar10.165441.2018@panix.com> Date: Fri, 10 Mar 1995 16:54:41 GMT References: <1995Mar06.005341.5011@clari.net> <1995Mar07.131641.2065@pacbell.net> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Mar07.131641.2065@pacbell.net>, jtakahashi@pacbell.net (Jens Takahashi) writes: > A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Tyler López "There are 14 nodes and only 10 countries. Count again." Mac IIci / 68882 FPU / SunOS 4.1.4