From hsouza@uni-hamburg.de Sat Oct 07 13:55:05 1995
Path: ashpoly!cascade!bigsur!uni-hamburg!hsouza
From: hsouza@uni-hamburg.de (Hugo Souza)
Newsgroups: comp.dsp
Subject: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Oct07.135505.8559@uni-hamburg.de>
Date: Sat, 07 Oct 1995 13:55:05 GMT
Organization: Universität Hamburg Fachbereich Informatik
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Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings.

The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20).
The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code.

Has anyone encountered bit errors in their decoded text? The Golay decoder corrects up to 3 bit errors per 24-bit codeword.

-- 
Hugo Souza -- Universität Hamburg Fachbereich Informatik
"Do not worship the copy."

From pmacdonald@pipeline.com Sat Oct 07 20:32:05 1995
Path: ashpoly!bigsur!pacrim!krgate!eunha!pipeline!pmacdonald
From: pmacdonald@pipeline.com (Pavel MacDonald)
Newsgroups: comp.dsp
Subject: Re: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Oct07.203205.5210@pipeline.com>
Date: Sat, 07 Oct 1995 20:32:05 GMT
References: <1995Oct07.135505.8559@uni-hamburg.de>
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In article <1995Oct07.135505.8559@uni-hamburg.de>, hsouza@uni-hamburg.de (Hugo Souza) writes:
> Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings.
> The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20).

On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text.

-- 
Pavel MacDonald | pmacdonald@pipeline.com
PGP Key fingerprint: 6BC5 E63E 0CB7 1200
"Keep the channels open."