From nlindqvist@netcom.com Thu Dec 05 16:45:49 1996
Path: ashpoly!bigsur!pacrim!jpgate!kamome!netcom!nlindqvist
From: nlindqvist@netcom.com (Nadia Lindqvist)
Newsgroups: comp.dsp
Subject: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1996Dec05.164549.4207@netcom.com>
Date: Thu, 05 Dec 1996 16:45:49 GMT
Organization: NETCOM On-Line Communication Services
NNTP-Posting-Host: netcom.com
X-Newsreader: WinVN 0.99.5
Lines: 11

Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings.

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

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

-- 
=== Nadia Lindqvist ===
Dept of Electrical Engineering, NETCOM On-Line Communication Services
"Hardware is temporary. The signal survives."

From rpark@earthlink.net Fri Dec 06 17:41:49 1996
Path: ashpoly!cascade!transat!eunet-fr!teletel!earthlink!rpark
From: rpark@earthlink.net (Renata Park)
Newsgroups: comp.dsp
Subject: Re: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1996Dec06.174149.6860@earthlink.net>
Date: Fri, 06 Dec 1996 17:41:49 GMT
References: <1996Dec05.164549.4207@netcom.com>
Organization: EarthLink Network
NNTP-Posting-Host: earthlink.net
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Lines: 10

In article <1996Dec05.164549.4207@netcom.com>, nlindqvist@netcom.com (Nadia Lindqvist) writes:
> Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings.
> Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'.

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

-- 
Renata Park | rpark@earthlink.net
PGP Key fingerprint: 51F2 C82E E7A1 377F
"Keep the channels open."