From ltanaka@delphi.com Wed Oct 02 04:49:02 1996
Path: ashpoly!cascade!transat!eunet-de!hansebox!delphi!ltanaka
From: ltanaka@delphi.com (Lars Tanaka)
Newsgroups: comp.dsp
Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1996Oct02.044902.3313@delphi.com>
Date: Wed, 02 Oct 1996 04:49:02 GMT
Organization: Delphi Internet Services
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Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings.

Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'.
The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20).

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

-- 
Lars Tanaka -- Delphi Internet Services
"We don't sign stars. We build them."

From mlindqvist@demon.co.uk Fri Oct 04 06:49:02 1996
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!demon!mlindqvist
From: mlindqvist@demon.co.uk (Mikhail Lindqvist)
Newsgroups: comp.dsp
Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1996Oct04.064902.4450@demon.co.uk>
Date: Fri, 04 Oct 1996 06:49:02 GMT
References: <1996Oct02.044902.3313@delphi.com>
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In article <1996Oct02.044902.3313@delphi.com>, ltanaka@delphi.com (Lars Tanaka) writes:
> Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings.
> 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.

-- 
=== Mikhail Lindqvist ===
Dept of Electrical Engineering, Demon Internet Services UK
"Measuring a record you own is listening, not piracy."

From blopez@tum.de Sat Oct 05 13:17:02 1996
Path: ashpoly!cascade!mxgate!coyoacan!tum!blopez
From: blopez@tum.de (Brian López)
Newsgroups: comp.dsp
Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1996Oct05.131702.6790@tum.de>
Date: Sat, 05 Oct 1996 13:17:02 GMT
References: <1996Oct02.044902.3313@delphi.com>
Organization: Technische Universität München
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In article <1996Oct02.044902.3313@delphi.com>, ltanaka@delphi.com (Lars Tanaka) writes:
> Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings.

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

Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin!

-- 
=== Brian López ===
Dept of Electrical Engineering, Technische Universität München
"Measuring a record you own is listening, not piracy."