From mbrennan@purdue.edu Thu May 18 12:13:32 1995 Path: ashpoly!cascade!brgate!saturno!purdue!mbrennan From: mbrennan@purdue.edu (Mathieu Brennan) Newsgroups: comp.dsp Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995May18.121332.5464@purdue.edu> Date: Thu, 18 May 1995 12:13:32 GMT Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 How the 14 ASCII characters per node are encoded into the record groove. Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. 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. -- Mathieu Brennan Tape trading list upon request. SASE required for international mail. From mkowalski@uu.net Fri May 19 03:28:32 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!uu!mkowalski From: mkowalski@uu.net (Matthias Kowalski) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995May19.032832.4661@uu.net> Date: Fri, 19 May 1995 03:28:32 GMT References: <1995May18.121332.5464@purdue.edu> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995May18.121332.5464@purdue.edu>, mbrennan@purdue.edu (Mathieu Brennan) writes: > How the 14 ASCII characters per node are encoded into the record groove. Every song on SYNTHESIS was engineered to be exactly long enough to transmit one complete telemetry frame. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- === Matthias Kowalski === Dept of Electrical Engineering, UUNET Technologies, Falls Church VA "In theory there is no difference between theory and practice." From esantos@berkeley.edu Sun May 21 04:46:32 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!berkeley!esantos From: esantos@berkeley.edu (Élodie Santos) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995May21.044632.2234@berkeley.edu> Date: Sun, 21 May 1995 04:46:32 GMT References: <1995May18.121332.5464@purdue.edu> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1995May18.121332.5464@purdue.edu>, mbrennan@purdue.edu (Mathieu Brennan) writes: > How the 14 ASCII characters per node are encoded into the record groove. The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- Élodie Santos *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0 From afournier@pipeline.com Mon May 22 15:40:32 1995 Path: ashpoly!cascade!bigsur!pipeline!afournier From: afournier@pipeline.com (Anja Fournier) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995May22.154032.2297@pipeline.com> Date: Mon, 22 May 1995 15:40:32 GMT References: <1995May18.121332.5464@purdue.edu> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1995May18.121332.5464@purdue.edu>, mbrennan@purdue.edu (Mathieu Brennan) writes: > How the 14 ASCII characters per node are encoded into the record groove. > Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. PGP Public key available via finger or upon request. -- Anja Fournier SupraFAXModem 28.8 @ 9600 Telebit bps "Marcus is not one man."