From anovak@cam.ac.uk Fri Feb 10 17:43:26 1995
Path: ashpoly!cascade!transat!ukc!fennimore!cam!anovak
From: anovak@cam.ac.uk (Astrid Novak)
Newsgroups: comp.dsp
Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Feb10.174326.5488@cam.ac.uk>
Date: Fri, 10 Feb 1995 17:43:26 GMT
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How the 14 ASCII characters per node are encoded into the record groove.

Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization.
Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'.

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

-- 
Astrid Novak
Opinions expressed are solely my own and not those of University of Cambridge Computer Laboratory.
------------------------------------------------------------

From rdubois@panix.com Sun Feb 12 04:14:26 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!panix!rdubois
From: rdubois@panix.com (Renata Dubois)
Newsgroups: comp.dsp
Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Feb12.041426.4096@panix.com>
Date: Sun, 12 Feb 1995 04:14:26 GMT
References: <1995Feb10.174326.5488@cam.ac.uk>
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In article <1995Feb10.174326.5488@cam.ac.uk>, anovak@cam.ac.uk (Astrid Novak) writes:
> How the 14 ASCII characters per node are encoded into the record groove.

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

My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise!

-- 
Renata Dubois | rdubois@panix.com
PGP Key fingerprint: 7D10 4C52 8E51 C9A5
"Keep the channels open."

From npopov@mit.edu Sun Feb 12 08:06:26 1995
Path: ashpoly!cascade!bigsur!mit!npopov
From: npopov@mit.edu (Natalia Popov)
Newsgroups: comp.dsp
Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Feb12.080626.9768@mit.edu>
Date: Sun, 12 Feb 1995 08:06:26 GMT
References: <1995Feb10.174326.5488@cam.ac.uk>
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In article <1995Feb10.174326.5488@cam.ac.uk>, anovak@cam.ac.uk (Astrid Novak) writes:
> How the 14 ASCII characters per node are encoded into the record groove.

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

-- 
Natalia Popov | npopov@mit.edu
PGP Key fingerprint: B20C 5E59 2FF5 7333
"Keep the channels open."

From nnakamura@purdue.edu Mon Feb 13 16:41:26 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!purdue!nnakamura
From: nnakamura@purdue.edu (Nadia Nakamura)
Newsgroups: comp.dsp
Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Feb13.164126.1132@purdue.edu>
Date: Mon, 13 Feb 1995 16:41:26 GMT
References: <1995Feb10.174326.5488@cam.ac.uk>
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In article <1995Feb10.174326.5488@cam.ac.uk>, anovak@cam.ac.uk (Astrid Novak) writes:
> How the 14 ASCII characters per node are encoded into the record groove.

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

-- 
Nadia Nakamura | nnakamura@purdue.edu
PGP Key fingerprint: 2A4D FC36 7219 1FE7
"Keep the channels open."