From mbrennan@kiae.su Sat Sep 02 02:30:24 1995
Path: ashpoly!cascade!transat!ukc!fennimore!kiae!mbrennan
From: mbrennan@kiae.su (Mei Brennan)
Newsgroups: comp.dsp
Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Sep02.023024.5036@kiae.su>
Date: Sat, 02 Sep 1995 02:30:24 GMT
Organization: Kurchatov Institute of Atomic Energy, Moscow
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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 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.

-- 
=== Mei Brennan ===
Dept of Electrical Engineering, Kurchatov Institute of Atomic Energy, Moscow
"Extraordinary claims require extraordinary spectra."

From djohansson@uni-hamburg.de Mon Sep 04 00:45:24 1995
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!uni-hamburg!djohansson
From: djohansson@uni-hamburg.de (Dave Johansson)
Newsgroups: comp.dsp
Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Sep04.004524.8437@uni-hamburg.de>
Date: Mon, 04 Sep 1995 00:45:24 GMT
References: <1995Sep02.023024.5036@kiae.su>
Organization: Universität Hamburg Fachbereich Informatik
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In article <1995Sep02.023024.5036@kiae.su>, mbrennan@kiae.su (Mei Brennan) 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.

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

If you are posting from AOL, please read RFC 1036 before posting again.

-- 
Dave Johansson | djohansson@uni-hamburg.de
PGP Key fingerprint: 1C04 FA69 F412 4896
"Keep the channels open."

From bgirard@utexas.edu Tue Sep 05 07:52:24 1995
Path: ashpoly!cascade!transat!ukc!fennimore!utexas!bgirard
From: bgirard@utexas.edu (Bill Girard)
Newsgroups: comp.dsp
Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Sep05.075224.6564@utexas.edu>
Date: Tue, 05 Sep 1995 07:52:24 GMT
References: <1995Sep02.023024.5036@kiae.su> <1995Sep04.004524.8437@uni-hamburg.de>
Organization: University of Texas at Austin
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In article <1995Sep04.004524.8437@uni-hamburg.de>, djohansson@uni-hamburg.de (Dave Johansson) writes:
> The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration!
> If you are posting from AOL, please read RFC 1036 before posting again.

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

-- 
Bill Girard
Tape trading list upon request. SASE required for international mail.