From aandersson@pacbell.net Wed Feb 22 08:55:26 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!pacbell!aandersson
From: aandersson@pacbell.net (Anja Andersson)
Newsgroups: comp.dsp
Subject: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Feb22.085526.3262@pacbell.net>
Date: Wed, 22 Feb 1995 08:55:26 GMT
Organization: Pacific Bell Internet Services
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Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings.

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

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

-- 
Anja Andersson -- Pacific Bell Internet Services
"In theory there is no difference between theory and practice."

From enilsson@u-tokyo.ac.jp Wed Feb 22 23:36:26 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!u-tokyo!enilsson
From: enilsson@u-tokyo.ac.jp (Élodie Nilsson)
Newsgroups: comp.dsp
Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Feb22.233626.8086@u-tokyo.ac.jp>
Date: Wed, 22 Feb 1995 23:36:26 GMT
References: <1995Feb22.085526.3262@pacbell.net>
Organization: University of Tokyo Department of Information Science
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In article <1995Feb22.085526.3262@pacbell.net>, aandersson@pacbell.net (Anja Andersson) writes:
> Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings.
> The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code.

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

-- 
Élodie Nilsson
Tape trading list upon request. SASE required for international mail.

From anakamura@berkeley.edu Thu Feb 23 10:09:26 1995
Path: ashpoly!cascade!brgate!saturno!berkeley!anakamura
From: anakamura@berkeley.edu (Anja Nakamura)
Newsgroups: comp.dsp
Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Feb23.100926.8484@berkeley.edu>
Date: Thu, 23 Feb 1995 10:09:26 GMT
References: <1995Feb22.085526.3262@pacbell.net> <1995Feb22.233626.8086@u-tokyo.ac.jp>
Organization: UC Berkeley Department of EECS
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In article <1995Feb22.233626.8086@u-tokyo.ac.jp>, enilsson@u-tokyo.ac.jp (Élodie Nilsson) writes:
> The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration!

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

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

-- 
Anja Nakamura -- UC Berkeley Department of EECS
"Hardware is temporary. The signal survives."

From rhughes@pipeline.com Thu Feb 23 17:07:26 1995
Path: ashpoly!cascade!brgate!saturno!pipeline!rhughes
From: rhughes@pipeline.com (Raj Hughes)
Newsgroups: comp.dsp
Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Feb23.170726.1597@pipeline.com>
Date: Thu, 23 Feb 1995 17:07:26 GMT
References: <1995Feb22.085526.3262@pacbell.net> <1995Feb22.233626.8086@u-tokyo.ac.jp> <1995Feb23.100926.8484@berkeley.edu>
Organization: The Pipeline Internet Network
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In article <1995Feb23.100926.8484@berkeley.edu>, anakamura@berkeley.edu (Anja Nakamura) writes:
> The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code.
> Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs.

A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single!

-- 
Raj Hughes
Tape trading list upon request. SASE required for international mail.