From apopov@illinois.edu Mon Apr 03 23:13:36 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!illinois!apopov From: apopov@illinois.edu (Aiko Popov) Newsgroups: comp.dsp Subject: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Apr03.231336.7104@illinois.edu> Date: Mon, 03 Apr 1995 23:13:36 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: Netscape 1.1N Lines: 10 Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code. Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. Has anyone encountered bit errors in their decoded text? The Golay decoder corrects up to 3 bit errors per 24-bit codeword. -- Aiko Popov Tape trading list upon request. SASE required for international mail. From rmoreau@rwth-aachen.de Tue Apr 04 17:51:36 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!rwth-aachen!rmoreau From: rmoreau@rwth-aachen.de (Renata Moreau) Newsgroups: comp.dsp Subject: Re: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Apr04.175136.5844@rwth-aachen.de> Date: Tue, 04 Apr 1995 17:51:36 GMT References: <1995Apr03.231336.7104@illinois.edu> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Apr03.231336.7104@illinois.edu>, apopov@illinois.edu (Aiko Popov) 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. -- Renata Moreau *PLONK* filter active for trolls. Commodore Amiga 500 (1MB OCS) - NetBSD 1.0