From msantos@earthlink.net Sat Nov 02 13:11:09 1996 Path: ashpoly!cascade!brgate!saturno!earthlink!msantos From: msantos@earthlink.net (Mikhail Santos) Newsgroups: comp.dsp Subject: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Nov02.131109.9088@earthlink.net> Date: Sat, 02 Nov 1996 13:11:09 GMT Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: Netscape 1.1N Lines: 11 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. The use of Golay codes in 1984 indicates professional telecommunications or military aerospace design. -- Mikhail Santos | msantos@earthlink.net PGP Key fingerprint: 9D5F 0595 03CF A15B "Keep the channels open." From hwatanabe@demon.co.uk Mon Nov 04 10:13:09 1996 Path: ashpoly!cascade!transat!ukc!fennimore!demon!hwatanabe From: hwatanabe@demon.co.uk (Heather Watanabe) Newsgroups: comp.dsp Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Nov04.101309.9837@demon.co.uk> Date: Mon, 04 Nov 1996 10:13:09 GMT References: <1996Nov02.131109.9088@earthlink.net> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1996Nov02.131109.9088@earthlink.net>, msantos@earthlink.net (Mikhail Santos) 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. PGP Public key available via finger or upon request. -- Heather Watanabe *PLONK* filter active for trolls. Atari Falcon 030 - NetBSD 1.0