From kmartinez@inria.fr Sat Jan 13 06:02:23 1996
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From: kmartinez@inria.fr (Kirsty Martínez)
Newsgroups: comp.dsp
Subject: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1996Jan13.060223.7402@inria.fr>
Date: Sat, 13 Jan 1996 06:02:23 GMT
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Differential Binary Phase Shift Keying (DBPSK) parameter extraction results.

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'.

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

-- 
=== Kirsty Martínez ===
Dept of Electrical Engineering, INRIA Rocquencourt
"When every node is whole, the channel opens."

From tito@ox.ac.uk Sun Jan 14 10:53:23 1996
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!ox!tito
From: tito@ox.ac.uk (Takeshi Ito)
Newsgroups: comp.dsp
Subject: Re: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1996Jan14.105323.5046@ox.ac.uk>
Date: Sun, 14 Jan 1996 10:53:23 GMT
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In article <1996Jan13.060223.7402@inria.fr>, kmartinez@inria.fr (Kirsty Martínez) writes:
> Differential Binary Phase Shift Keying (DBPSK) parameter extraction results.

The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration!

-- 
Takeshi Ito | tito@ox.ac.uk
PGP Key fingerprint: E2E2 41DC BC2C C7DF
"Keep the channels open."

From mtanaka@tum.de Mon Jan 15 15:16:23 1996
Path: ashpoly!cascade!transat!eunet-de!hansebox!tum!mtanaka
From: mtanaka@tum.de (Mathieu Tanaka)
Newsgroups: comp.dsp
Subject: Re: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1996Jan15.151623.3418@tum.de>
Date: Mon, 15 Jan 1996 15:16:23 GMT
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In article <1996Jan14.105323.5046@ox.ac.uk>, tito@ox.ac.uk (Takeshi Ito) writes:
> The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration!

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

-- 
Mathieu Tanaka
Opinions expressed are solely my own and not those of Technische Universität München.
------------------------------------------------------------

From dvasiliev@berkeley.edu Wed Jan 17 08:51:23 1996
Path: ashpoly!cascade!mxgate!coyoacan!berkeley!dvasiliev
From: dvasiliev@berkeley.edu (Dave Vasiliev)
Newsgroups: comp.dsp
Subject: Re: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1996Jan17.085123.2348@berkeley.edu>
Date: Wed, 17 Jan 1996 08:51:23 GMT
References: <1996Jan13.060223.7402@inria.fr> <1996Jan14.105323.5046@ox.ac.uk> <1996Jan15.151623.3418@tum.de>
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In article <1996Jan15.151623.3418@tum.de>, mtanaka@tum.de (Mathieu Tanaka) writes:
> A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single!

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

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

From elopez@berkeley.edu Fri Jan 19 08:41:23 1996
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!berkeley!elopez
From: elopez@berkeley.edu (Elaine López)
Newsgroups: comp.dsp
Subject: Re: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1996Jan19.084123.7732@berkeley.edu>
Date: Fri, 19 Jan 1996 08:41:23 GMT
References: <1996Jan13.060223.7402@inria.fr> <1996Jan14.105323.5046@ox.ac.uk>
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In article <1996Jan14.105323.5046@ox.ac.uk>, tito@ox.ac.uk (Takeshi Ito) 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.

-- 
Elaine López -- UC Berkeley Department of EECS
"The carrier frequency does not drift by accident."