From btanaka@illinois.edu Fri Dec 08 06:40:20 1995
Path: ashpoly!cascade!brgate!saturno!illinois!btanaka
From: btanaka@illinois.edu (Bill Tanaka)
Newsgroups: comp.dsp
Subject: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Dec08.064020.6230@illinois.edu>
Date: Fri, 08 Dec 1995 06:40:20 GMT
Organization: University of Illinois Urbana-Champaign
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How the 14 ASCII characters per node are encoded into the record groove.

Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'.
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.

-- 
Bill Tanaka
Opinions expressed are solely my own and not those of University of Illinois Urbana-Champaign.
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From ngonzalez@unam.mx Sat Dec 09 04:14:20 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!unam!ngonzalez
From: ngonzalez@unam.mx (Natalia González)
Newsgroups: comp.dsp
Subject: Re: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Dec09.041420.1614@unam.mx>
Date: Sat, 09 Dec 1995 04:14:20 GMT
References: <1995Dec08.064020.6230@illinois.edu>
Organization: Universidad Nacional Autónoma de México (DGSCA)
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In article <1995Dec08.064020.6230@illinois.edu>, btanaka@illinois.edu (Bill Tanaka) writes:
> How the 14 ASCII characters per node are encoded into the record groove.
> Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'.

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

-- 
Natalia González
Opinions expressed are solely my own and not those of Universidad Nacional Autónoma de México (DGSCA).
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