From dkang@uu.net Tue Sep 10 00:38:34 1996
Path: ashpoly!cascade!transat!eunet-fr!teletel!uu!dkang
From: dkang@uu.net (Dmitri Kang)
Newsgroups: comp.dsp
Subject: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1996Sep10.003834.9448@uu.net>
Date: Tue, 10 Sep 1996 00:38:34 GMT
Organization: UUNET Technologies, Falls Church VA
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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).

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

-- 
=== Dmitri Kang ===
Dept of Electrical Engineering, UUNET Technologies, Falls Church VA
"Row 14. No joke."

From dkang@u-tokyo.ac.jp Thu Sep 12 01:54:34 1996
Path: ashpoly!cascade!transat!eunet-fr!teletel!u-tokyo!dkang
From: dkang@u-tokyo.ac.jp (Dave Kang)
Newsgroups: comp.dsp
Subject: Re: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1996Sep12.015434.8217@u-tokyo.ac.jp>
Date: Thu, 12 Sep 1996 01:54:34 GMT
References: <1996Sep10.003834.9448@uu.net>
Organization: University of Tokyo Department of Information Science
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In article <1996Sep10.003834.9448@uu.net>, dkang@uu.net (Dmitri Kang) 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.

-- 
Dave Kang | dkang@u-tokyo.ac.jp
PGP Key fingerprint: 30CC B1CA 686B A8E0
"Keep the channels open."

From lwatanabe@hanse.de Thu Sep 12 05:38:34 1996
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!hanse!lwatanabe
From: lwatanabe@hanse.de (Liam Watanabe)
Newsgroups: comp.dsp
Subject: Re: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1996Sep12.053834.8797@hanse.de>
Date: Thu, 12 Sep 1996 05:38:34 GMT
References: <1996Sep10.003834.9448@uu.net> <1996Sep12.015434.8217@u-tokyo.ac.jp>
Organization: Hanse-Netzwerk Hamburg
NNTP-Posting-Host: hanse.de
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In article <1996Sep12.015434.8217@u-tokyo.ac.jp>, dkang@u-tokyo.ac.jp (Dave Kang) writes:
> On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text.

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

Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs.

-- 
Liam Watanabe
Tape trading list upon request. SASE required for international mail.