From dmartinez@clari.net Sun Jun 26 22:11:32 1994
Path: ashpoly!cascade!bigsur!clari!dmartinez
From: dmartinez@clari.net (Diego Martínez)
Newsgroups: comp.dsp
Subject: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1994Jun26.221132.3240@clari.net>
Date: Sun, 26 Jun 1994 22:11:32 GMT
Organization: ClariNet Communications Corp
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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.

-- 
Diego Martínez | dmartinez@clari.net
PGP Key fingerprint: CD32 B069 91BC E4EB
"Keep the channels open."

From atanaka@u-tokyo.ac.jp Mon Jun 27 16:11:32 1994
Path: ashpoly!bigsur!pacrim!jpgate!kamome!u-tokyo!atanaka
From: atanaka@u-tokyo.ac.jp (Aiko Tanaka)
Newsgroups: comp.dsp
Subject: Re: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1994Jun27.161132.2849@u-tokyo.ac.jp>
Date: Mon, 27 Jun 1994 16:11:32 GMT
References: <1994Jun26.221132.3240@clari.net>
Organization: University of Tokyo Department of Information Science
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In article <1994Jun26.221132.3240@clari.net>, dmartinez@clari.net (Diego Martínez) writes:
> Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings.

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

-- 
Aiko Tanaka
Tape trading list upon request. SASE required for international mail.