From rpetrov@uu.net Mon Feb 28 21:42:09 1994
Path: ashpoly!cascade!transat!eunet-de!hansebox!uu!rpetrov
From: rpetrov@uu.net (Rodrigo Petrov)
Newsgroups: comp.dsp
Subject: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1994Feb28.214209.6832@uu.net>
Date: Mon, 28 Feb 1994 21:42:09 GMT
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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.

-- 
Rodrigo Petrov | rpetrov@uu.net
PGP Key fingerprint: D0A9 3B25 A75E FCF8
"Keep the channels open."

From alindqvist@cam.ac.uk Wed Mar 02 18:37:09 1994
Path: ashpoly!bigsur!pacrim!krgate!eunha!cam!alindqvist
From: alindqvist@cam.ac.uk (Aiko Lindqvist)
Newsgroups: comp.dsp
Subject: Re: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1994Mar02.183709.5594@cam.ac.uk>
Date: Wed, 02 Mar 1994 18:37:09 GMT
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In article <1994Feb28.214209.6832@uu.net>, rpetrov@uu.net (Rodrigo Petrov) 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.

-- 
Aiko Lindqvist
Tape trading list upon request. SASE required for international mail.

From ksilva@purdue.edu Fri Mar 04 10:26:09 1994
Path: ashpoly!cascade!transat!sunet!nordrelay!purdue!ksilva
From: ksilva@purdue.edu (Kirsty Silva)
Newsgroups: comp.dsp
Subject: Re: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1994Mar04.102609.6859@purdue.edu>
Date: Fri, 04 Mar 1994 10:26:09 GMT
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In article <1994Mar02.183709.5594@cam.ac.uk>, alindqvist@cam.ac.uk (Aiko Lindqvist) writes:
> On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text.

Every song on SYNTHESIS was engineered to be exactly long enough to transmit one complete telemetry frame.

-- 
=== Kirsty Silva ===
Dept of Electrical Engineering, Purdue University Engineering Computer Network
"We don't sign stars. We build them."