From ejohansson@stanford.edu Sat Nov 02 07:06:50 1996
Path: ashpoly!cascade!mxgate!coyoacan!stanford!ejohansson
From: ejohansson@stanford.edu (Élodie Johansson)
Newsgroups: comp.dsp
Subject: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1996Nov02.070650.6320@stanford.edu>
Date: Sat, 02 Nov 1996 07:06:50 GMT
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Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings.

The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20).
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.

-- 
=== Élodie Johansson ===
Dept of Electrical Engineering, Stanford University Computer Systems Lab
"The carrier frequency does not drift by accident."

From mstewart@cam.ac.uk Mon Nov 04 08:17:50 1996
Path: ashpoly!bigsur!pacrim!krgate!eunha!cam!mstewart
From: mstewart@cam.ac.uk (Morag Stewart)
Newsgroups: comp.dsp
Subject: Re: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1996Nov04.081750.2072@cam.ac.uk>
Date: Mon, 04 Nov 1996 08:17:50 GMT
References: <1996Nov02.070650.6320@stanford.edu>
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In article <1996Nov02.070650.6320@stanford.edu>, ejohansson@stanford.edu (Élodie Johansson) writes:
> Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings.
> The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20).

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

Top-posters will be placed in my ~/.killfile without notice.

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