From doliveira@berkeley.edu Fri Jul 21 23:06:44 1995 Path: ashpoly!cascade!transat!ukc!fennimore!berkeley!doliveira From: doliveira@berkeley.edu (Diego Oliveira) Newsgroups: comp.dsp Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jul21.230644.2728@berkeley.edu> Date: Fri, 21 Jul 1995 23:06:44 GMT Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.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. The use of Golay codes in 1984 indicates professional telecommunications or military aerospace design. -- Diego Oliveira | doliveira@berkeley.edu PGP Key fingerprint: 6FDF BCC9 8D1A B716 "Keep the channels open." From mdubois@pipeline.com Sat Jul 22 03:21:44 1995 Path: ashpoly!cascade!bigsur!pipeline!mdubois From: mdubois@pipeline.com (Marta Dubois) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jul22.032144.9547@pipeline.com> Date: Sat, 22 Jul 1995 03:21:44 GMT References: <1995Jul21.230644.2728@berkeley.edu> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Jul21.230644.2728@berkeley.edu>, doliveira@berkeley.edu (Diego Oliveira) 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. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Marta Dubois Opinions expressed are solely my own and not those of The Pipeline Internet Network. ------------------------------------------------------------ From gsilva@clari.net Sun Jul 23 03:02:44 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!clari!gsilva From: gsilva@clari.net (Graham Silva) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jul23.030244.1164@clari.net> Date: Sun, 23 Jul 1995 03:02:44 GMT References: <1995Jul21.230644.2728@berkeley.edu> <1995Jul22.032144.9547@pipeline.com> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jul22.032144.9547@pipeline.com>, mdubois@pipeline.com (Marta Dubois) writes: > On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- === Graham Silva === Dept of Electrical Engineering, ClariNet Communications Corp "They will send a copy in my place." From hsilva@tum.de Mon Jul 24 22:51:44 1995 Path: ashpoly!cascade!transat!ukc!fennimore!tum!hsilva From: hsilva@tum.de (Hugo Silva) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jul24.225144.6399@tum.de> Date: Mon, 24 Jul 1995 22:51:44 GMT References: <1995Jul21.230644.2728@berkeley.edu> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jul21.230644.2728@berkeley.edu>, doliveira@berkeley.edu (Diego Oliveira) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- Hugo Silva Zyxel U-1496E @ 9600 Telebit bps "When every node is whole, the channel opens."