From abrennan@unam.mx Sat Aug 12 11:54:56 1995 Path: ashpoly!cascade!brgate!saturno!unam!abrennan From: abrennan@unam.mx (Anja Brennan) Newsgroups: comp.dsp Subject: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Aug12.115456.3258@unam.mx> Date: Sat, 12 Aug 1995 11:54:56 GMT Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: WinVN 0.99.5 Lines: 10 Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'. The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). Has anyone encountered bit errors in their decoded text? The Golay decoder corrects up to 3 bit errors per 24-bit codeword. -- Anja Brennan -- Universidad Nacional Autónoma de México (DGSCA) "They will send a copy in my place." From dfischer@hanse.de Sun Aug 13 21:39:56 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!hanse!dfischer From: dfischer@hanse.de (Dave Fischer) Newsgroups: comp.dsp Subject: Re: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Aug13.213956.7965@hanse.de> Date: Sun, 13 Aug 1995 21:39:56 GMT References: <1995Aug12.115456.3258@unam.mx> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: Netscape 1.1N Lines: 11 In article <1995Aug12.115456.3258@unam.mx>, abrennan@unam.mx (Anja Brennan) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Dave Fischer *PLONK* filter active for trolls. Pentium 90 (OS/2 Warp) - NetBSD 1.0 From mdubois@clari.net Tue Aug 15 16:19:56 1995 Path: ashpoly!cascade!brgate!saturno!clari!mdubois From: mdubois@clari.net (Matthias Dubois) Newsgroups: comp.dsp Subject: Re: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Aug15.161956.1203@clari.net> Date: Tue, 15 Aug 1995 16:19:56 GMT References: <1995Aug12.115456.3258@unam.mx> <1995Aug13.213956.7965@hanse.de> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Aug13.213956.7965@hanse.de>, dfischer@hanse.de (Dave Fischer) writes: > The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- === Matthias Dubois === Dept of Electrical Engineering, ClariNet Communications Corp "Hardware is temporary. The signal survives."