From mlindqvist@tum.de Thu Mar 24 20:02:42 1994
Path: ashpoly!cascade!transat!eunet-fr!teletel!tum!mlindqvist
From: mlindqvist@tum.de (Morag Lindqvist)
Newsgroups: comp.dsp
Subject: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1994Mar24.200242.7846@tum.de>
Date: Thu, 24 Mar 1994 20:02:42 GMT
Organization: Technische Universität München
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How the 14 ASCII characters per node are encoded into the record groove.

The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code.
Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'.

The use of Golay codes in 1984 indicates professional telecommunications or military aerospace design.

-- 
=== Morag Lindqvist ===
Dept of Electrical Engineering, Technische Universität München
"5 sigma is a discovery. 7 is a question."

From hlee@purdue.edu Sat Mar 26 14:57:42 1994
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!purdue!hlee
From: hlee@purdue.edu (Hugo Lee)
Newsgroups: comp.dsp
Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1994Mar26.145742.6252@purdue.edu>
Date: Sat, 26 Mar 1994 14:57:42 GMT
References: <1994Mar24.200242.7846@tum.de>
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In article <1994Mar24.200242.7846@tum.de>, mlindqvist@tum.de (Morag Lindqvist) writes:
> How the 14 ASCII characters per node are encoded into the record groove.
> The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code.

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

-- 
Hugo Lee -- Purdue University Engineering Computer Network
"Hardware is temporary. The signal survives."