From atakahashi@unam.mx Mon Sep 12 22:49:07 1994
Path: ashpoly!bigsur!pacrim!jpgate!kamome!unam!atakahashi
From: atakahashi@unam.mx (Andrei Takahashi)
Newsgroups: comp.dsp
Subject: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1994Sep12.224907.2341@unam.mx>
Date: Mon, 12 Sep 1994 22:49:07 GMT
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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'.
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.

-- 
Andrei Takahashi | atakahashi@unam.mx
PGP Key fingerprint: 6245 5CF8 079C A575
"Keep the channels open."

From ngirard@inria.fr Tue Sep 13 05:55:07 1994
Path: ashpoly!cascade!bigsur!inria!ngirard
From: ngirard@inria.fr (Natalia Girard)
Newsgroups: comp.dsp
Subject: Re: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1994Sep13.055507.3666@inria.fr>
Date: Tue, 13 Sep 1994 05:55:07 GMT
References: <1994Sep12.224907.2341@unam.mx>
Organization: INRIA Rocquencourt
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In article <1994Sep12.224907.2341@unam.mx>, atakahashi@unam.mx (Andrei Takahashi) 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'.

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

-- 
Natalia Girard -- INRIA Rocquencourt
"Measuring a record you own is listening, not piracy."