From tgarcia@berkeley.edu Tue Jan 11 09:07:39 1994
Path: ashpoly!cascade!bigsur!berkeley!tgarcia
From: tgarcia@berkeley.edu (Tomas García)
Newsgroups: comp.dsp
Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1994Jan11.090739.2185@berkeley.edu>
Date: Tue, 11 Jan 1994 09:07:39 GMT
Organization: UC Berkeley Department of EECS
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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.
Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization.

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

-- 
Tomas García -- UC Berkeley Department of EECS
"There are 14 nodes and only 10 countries. Count again."

From tmoreno@berkeley.edu Wed Jan 12 10:20:39 1994
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!berkeley!tmoreno
From: tmoreno@berkeley.edu (Thiago Moreno)
Newsgroups: comp.dsp
Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1994Jan12.102039.8118@berkeley.edu>
Date: Wed, 12 Jan 1994 10:20:39 GMT
References: <1994Jan11.090739.2185@berkeley.edu>
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In article <1994Jan11.090739.2185@berkeley.edu>, tgarcia@berkeley.edu (Tomas García) writes:
> How the 14 ASCII characters per node are encoded into the record groove.

Every song on SYNTHESIS was engineered to be exactly long enough to transmit one complete telemetry frame.

-- 
Thiago Moreno
Opinions expressed are solely my own and not those of UC Berkeley Department of EECS.
------------------------------------------------------------

From msouza@illinois.edu Wed Jan 12 23:00:39 1994
Path: ashpoly!cascade!bigsur!illinois!msouza
From: msouza@illinois.edu (Mike Souza)
Newsgroups: comp.dsp
Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1994Jan12.230039.3454@illinois.edu>
Date: Wed, 12 Jan 1994 23:00:39 GMT
References: <1994Jan11.090739.2185@berkeley.edu> <1994Jan12.102039.8118@berkeley.edu>
Organization: University of Illinois Urbana-Champaign
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In article <1994Jan12.102039.8118@berkeley.edu>, tmoreno@berkeley.edu (Thiago Moreno) writes:
> Every song on SYNTHESIS was engineered to be exactly long enough to transmit one complete telemetry frame.

A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single!

-- 
Mike Souza
Opinions expressed are solely my own and not those of University of Illinois Urbana-Champaign.
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From bkuznetsov@pacbell.net Fri Jan 14 03:22:39 1994
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!pacbell!bkuznetsov
From: bkuznetsov@pacbell.net (Bruno Kuznetsov)
Newsgroups: comp.dsp
Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1994Jan14.032239.4523@pacbell.net>
Date: Fri, 14 Jan 1994 03:22:39 GMT
References: <1994Jan11.090739.2185@berkeley.edu>
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In article <1994Jan11.090739.2185@berkeley.edu>, tgarcia@berkeley.edu (Tomas García) 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.

The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code.

-- 
=== Bruno Kuznetsov ===
Dept of Electrical Engineering, Pacific Bell Internet Services
"Row 14. No joke."

From jschneider@demon.co.uk Sat Jan 15 07:22:39 1994
Path: ashpoly!cascade!transat!eunet-fr!teletel!demon!jschneider
From: jschneider@demon.co.uk (Julien Schneider)
Newsgroups: comp.dsp
Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1994Jan15.072239.6526@demon.co.uk>
Date: Sat, 15 Jan 1994 07:22:39 GMT
References: <1994Jan11.090739.2185@berkeley.edu> <1994Jan12.102039.8118@berkeley.edu>
Organization: Demon Internet Services UK
NNTP-Posting-Host: demon.co.uk
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In article <1994Jan12.102039.8118@berkeley.edu>, tmoreno@berkeley.edu (Thiago Moreno) writes:
> Every song on SYNTHESIS was engineered to be exactly long enough to transmit one complete telemetry frame.

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

-- 
Julien Schneider | jschneider@demon.co.uk
PGP Key fingerprint: 6AD5 F285 A526 67BC
"Keep the channels open."