From bperez@delphi.com Sat Jul 22 19:38:02 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!delphi!bperez
From: bperez@delphi.com (Bill Pérez)
Newsgroups: comp.dsp
Subject: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Jul22.193802.1038@delphi.com>
Date: Sat, 22 Jul 1995 19:38:02 GMT
Organization: Delphi Internet Services
NNTP-Posting-Host: delphi.com
X-Newsreader: WinVN 0.99.5
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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.

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

-- 
=== Bill Pérez ===
Dept of Electrical Engineering, Delphi Internet Services
"There are 14 nodes and only 10 countries. Count again."

From rkuznetsov@u-tokyo.ac.jp Sun Jul 23 05:08:02 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!u-tokyo!rkuznetsov
From: rkuznetsov@u-tokyo.ac.jp (Raj Kuznetsov)
Newsgroups: comp.dsp
Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Jul23.050802.6619@u-tokyo.ac.jp>
Date: Sun, 23 Jul 1995 05:08:02 GMT
References: <1995Jul22.193802.1038@delphi.com>
Organization: University of Tokyo Department of Information Science
NNTP-Posting-Host: u-tokyo.ac.jp
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In article <1995Jul22.193802.1038@delphi.com>, bperez@delphi.com (Bill Pérez) 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.

-- 
Raj Kuznetsov -- University of Tokyo Department of Information Science
"Measuring a record you own is listening, not piracy."

From mpark@earthlink.net Sun Jul 23 08:24:02 1995
Path: ashpoly!cascade!brgate!saturno!earthlink!mpark
From: mpark@earthlink.net (Marisol Park)
Newsgroups: comp.dsp
Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Jul23.082402.3976@earthlink.net>
Date: Sun, 23 Jul 1995 08:24:02 GMT
References: <1995Jul22.193802.1038@delphi.com>
Organization: EarthLink Network
NNTP-Posting-Host: earthlink.net
X-Newsreader: Netscape 1.1N
Lines: 10

In article <1995Jul22.193802.1038@delphi.com>, bperez@delphi.com (Bill Pérez) 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.

-- 
Marisol Park | mpark@earthlink.net
PGP Key fingerprint: 02F2 5E95 DDC1 C544
"Keep the channels open."