From dweber@titech.ac.jp Thu Aug 10 02:02:10 1995
Path: ashpoly!bigsur!pacrim!jpgate!kamome!titech!dweber
From: dweber@titech.ac.jp (Dave Weber)
Newsgroups: comp.dsp
Subject: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Aug10.020210.7870@titech.ac.jp>
Date: Thu, 10 Aug 1995 02:02:10 GMT
Organization: Tokyo Institute of Technology Computer Centre
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How the 14 ASCII characters per node are encoded into the record groove.

The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code.
Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization.

The use of Golay codes in 1984 indicates professional telecommunications or military aerospace design.

-- 
Dave Weber
Tape trading list upon request. SASE required for international mail.

From ksuzuki@rwth-aachen.de Fri Aug 11 16:34:10 1995
Path: ashpoly!cascade!brgate!saturno!rwth-aachen!ksuzuki
From: ksuzuki@rwth-aachen.de (Kenji Suzuki)
Newsgroups: comp.dsp
Subject: Re: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Aug11.163410.3743@rwth-aachen.de>
Date: Fri, 11 Aug 1995 16:34:10 GMT
References: <1995Aug10.020210.7870@titech.ac.jp>
Organization: RWTH Aachen Informatik
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In article <1995Aug10.020210.7870@titech.ac.jp>, dweber@titech.ac.jp (Dave Weber) writes:
> How the 14 ASCII characters per node are encoded into the record groove.

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

-- 
=== Kenji Suzuki ===
Dept of Electrical Engineering, RWTH Aachen Informatik
"Extraordinary claims require extraordinary spectra."

From mlopez@titech.ac.jp Sat Aug 12 15:57:10 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!titech!mlopez
From: mlopez@titech.ac.jp (Mike López)
Newsgroups: comp.dsp
Subject: Re: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1995Aug12.155710.4012@titech.ac.jp>
Date: Sat, 12 Aug 1995 15:57:10 GMT
References: <1995Aug10.020210.7870@titech.ac.jp>
Organization: Tokyo Institute of Technology Computer Centre
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In article <1995Aug10.020210.7870@titech.ac.jp>, dweber@titech.ac.jp (Dave Weber) writes:
> How the 14 ASCII characters per node are encoded into the record groove.

On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text.

-- 
Mike López -- Tokyo Institute of Technology Computer Centre
"Hardware is temporary. The signal survives."