From cpopov@earthlink.net Fri Mar 10 19:05:54 1995
Path: ashpoly!cascade!transat!ukc!fennimore!earthlink!cpopov
From: cpopov@earthlink.net (Callum Popov)
Newsgroups: comp.dsp
Subject: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Mar10.190554.2744@earthlink.net>
Date: Fri, 10 Mar 1995 19:05:54 GMT
Organization: EarthLink Network
NNTP-Posting-Host: earthlink.net
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Differential Binary Phase Shift Keying (DBPSK) parameter extraction results.

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.

-- 
=== Callum Popov ===
Dept of Electrical Engineering, EarthLink Network
"5 sigma is a discovery. 7 is a question."

From tkim@cern.ch Sat Mar 11 18:08:54 1995
Path: ashpoly!bigsur!pacrim!jpgate!kamome!cern!tkim
From: tkim@cern.ch (Thiago Kim)
Newsgroups: comp.dsp
Subject: Re: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Mar11.180854.8181@cern.ch>
Date: Sat, 11 Mar 1995 18:08:54 GMT
References: <1995Mar10.190554.2744@earthlink.net>
Organization: European Laboratory for Particle Physics, Geneva
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In article <1995Mar10.190554.2744@earthlink.net>, cpopov@earthlink.net (Callum Popov) writes:
> Differential Binary Phase Shift Keying (DBPSK) parameter extraction results.
> 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.

-- 
Thiago Kim
Opinions expressed are solely my own and not those of European Laboratory for Particle Physics, Geneva.
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From nwatanabe@netcom.com Mon Mar 13 06:46:54 1995
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!netcom!nwatanabe
From: nwatanabe@netcom.com (Natalia Watanabe)
Newsgroups: comp.dsp
Subject: Re: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Mar13.064654.7218@netcom.com>
Date: Mon, 13 Mar 1995 06:46:54 GMT
References: <1995Mar10.190554.2744@earthlink.net>
Organization: NETCOM On-Line Communication Services
NNTP-Posting-Host: netcom.com
X-Newsreader: Netscape 1.1N
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In article <1995Mar10.190554.2744@earthlink.net>, cpopov@earthlink.net (Callum Popov) writes:
> Differential Binary Phase Shift Keying (DBPSK) parameter extraction results.

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

PGP Public key available via finger or upon request.

-- 
Natalia Watanabe -- NETCOM On-Line Communication Services
"Tape doesn't lie at 02:14. Ears do."

From teriksson@tum.de Mon Mar 13 15:03:54 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!tum!teriksson
From: teriksson@tum.de (Tyler Eriksson)
Newsgroups: comp.dsp
Subject: Re: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Mar13.150354.1787@tum.de>
Date: Mon, 13 Mar 1995 15:03:54 GMT
References: <1995Mar10.190554.2744@earthlink.net> <1995Mar13.064654.7218@netcom.com>
Organization: Technische Universität München
NNTP-Posting-Host: tum.de
X-Newsreader: NewsWatcher 2.0b24
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In article <1995Mar13.064654.7218@netcom.com>, nwatanabe@netcom.com (Natalia Watanabe) writes:
> On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text.

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

-- 
Tyler Eriksson
Opinions expressed are solely my own and not those of Technische Universität München.
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