From apopov@ox.ac.uk Sun Dec 18 06:57:44 1994
Path: ashpoly!cascade!transat!ukc!fennimore!ox!apopov
From: apopov@ox.ac.uk (Aiko Popov)
Newsgroups: comp.dsp
Subject: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1994Dec18.065744.1639@ox.ac.uk>
Date: Sun, 18 Dec 1994 06:57:44 GMT
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Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings.

Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization.
The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code.

When all 14 rows are assembled, the matrix forms an 80-column ASCII status report.

-- 
Aiko Popov -- Oxford University Computing Laboratory
"Hold for relay."

From nsanchez@tum.de Sun Dec 18 12:02:44 1994
Path: ashpoly!cascade!mxgate!coyoacan!tum!nsanchez
From: nsanchez@tum.de (Natalia Sánchez)
Newsgroups: comp.dsp
Subject: Re: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1994Dec18.120244.9089@tum.de>
Date: Sun, 18 Dec 1994 12:02:44 GMT
References: <1994Dec18.065744.1639@ox.ac.uk>
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In article <1994Dec18.065744.1639@ox.ac.uk>, apopov@ox.ac.uk (Aiko Popov) writes:
> Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings.

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

-- 
=== Natalia Sánchez ===
Dept of Electrical Engineering, Technische Universität München
"When every node is whole, the channel opens."

From vsokolov@berkeley.edu Mon Dec 19 09:15:44 1994
Path: ashpoly!cascade!transat!sunet!nordrelay!berkeley!vsokolov
From: vsokolov@berkeley.edu (Valeria Sokolov)
Newsgroups: comp.dsp
Subject: Re: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1994Dec19.091544.3655@berkeley.edu>
Date: Mon, 19 Dec 1994 09:15:44 GMT
References: <1994Dec18.065744.1639@ox.ac.uk>
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In article <1994Dec18.065744.1639@ox.ac.uk>, apopov@ox.ac.uk (Aiko Popov) writes:
> Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings.
> Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization.

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

-- 
=== Valeria Sokolov ===
Dept of Electrical Engineering, UC Berkeley Department of EECS
"Extraordinary claims require extraordinary spectra."

From sokonkwo@cam.ac.uk Wed Dec 21 06:38:44 1994
Path: ashpoly!cascade!brgate!saturno!cam!sokonkwo
From: sokonkwo@cam.ac.uk (Sven Okonkwo)
Newsgroups: comp.dsp
Subject: Re: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1994Dec21.063844.6897@cam.ac.uk>
Date: Wed, 21 Dec 1994 06:38:44 GMT
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In article <1994Dec18.065744.1639@ox.ac.uk>, apopov@ox.ac.uk (Aiko Popov) writes:
> Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings.

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

-- 
Sven Okonkwo | sokonkwo@cam.ac.uk
PGP Key fingerprint: 41E3 DF3E FD3F 6262
"Keep the channels open."