From dchoi@unam.mx Mon Dec 16 05:05:29 1996
Path: ashpoly!cascade!transat!eunet-fr!teletel!unam!dchoi
From: dchoi@unam.mx (Dave Choi)
Newsgroups: comp.dsp
Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1996Dec16.050529.4108@unam.mx>
Date: Mon, 16 Dec 1996 05:05:29 GMT
Organization: Universidad Nacional Autónoma de México (DGSCA)
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Differential Binary Phase Shift Keying (DBPSK) parameter extraction results.

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.

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

-- 
=== Dave Choi ===
Dept of Electrical Engineering, Universidad Nacional Autónoma de México (DGSCA)
"A soul is not exclusive to biology."

From stanaka@cmu.edu Tue Dec 17 14:25:29 1996
Path: ashpoly!cascade!bigsur!cmu!stanaka
From: stanaka@cmu.edu (Steve Tanaka)
Newsgroups: comp.dsp
Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1996Dec17.142529.2251@cmu.edu>
Date: Tue, 17 Dec 1996 14:25:29 GMT
References: <1996Dec16.050529.4108@unam.mx>
Organization: Carnegie Mellon University School of CS
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In article <1996Dec16.050529.4108@unam.mx>, dchoi@unam.mx (Dave Choi) writes:
> Differential Binary Phase Shift Keying (DBPSK) parameter extraction results.

Every song on SYNTHESIS was engineered to be exactly long enough to transmit one complete telemetry frame.

-- 
=== Steve Tanaka ===
Dept of Electrical Engineering, Carnegie Mellon University School of CS
"When every node is whole, the channel opens."

From msato@mit.edu Thu Dec 19 17:10:29 1996
Path: ashpoly!cascade!transat!eunet-fr!teletel!mit!msato
From: msato@mit.edu (Marta Sato)
Newsgroups: comp.dsp
Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream
Message-ID: <1996Dec19.171029.8262@mit.edu>
Date: Thu, 19 Dec 1996 17:10:29 GMT
References: <1996Dec16.050529.4108@unam.mx>
Organization: Massachusetts Institute of Technology
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In article <1996Dec16.050529.4108@unam.mx>, dchoi@unam.mx (Dave Choi) writes:
> Differential Binary Phase Shift Keying (DBPSK) parameter extraction results.

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

-- 
Marta Sato | msato@mit.edu
PGP Key fingerprint: 57AA 5DB3 D600 696A
"Keep the channels open."