<span style=" font-size:10pt;font-family:sans-serif">Just an hint.</span>
<br><span style=" font-size:10pt;font-family:sans-serif">We have already
a Technical Corrigendum 3 to CCSDS 123.0-B-2, Issued February 2019 and
I fear the (unwritten) rule is that 3 is the maximum number of corrigenda.</span>
<br><span style=" font-size:10pt;font-family:sans-serif">Therefore you
better check with Tom (cc'ed here) about this.</span>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">CIao</span>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">Gian Paolo</span>
<br><span style=" font-size:10pt;font-family:sans-serif">(Not AD :o)</span>
<br>
<br>
<br>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">From:
</span><span style=" font-size:9pt;font-family:sans-serif">Roberto.Camarero@esa.int</span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">To:
</span><span style=" font-size:9pt;font-family:sans-serif">"Kiely,
Aaron B (US 332B)" <aaron.b.kiely@jpl.nasa.gov></span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Cc:
</span><span style=" font-size:9pt;font-family:sans-serif">"sls-dc@mailman.ccsds.org"
<sls-dc@mailman.ccsds.org></span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Date:
</span><span style=" font-size:9pt;font-family:sans-serif">04-08-21
09:52</span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Subject:
</span><span style=" font-size:9pt;font-family:sans-serif">Re:
[SLS-DC] 123B2 Corrigendum</span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Sent
by: </span><span style=" font-size:9pt;font-family:sans-serif">"SLS-DC"
<sls-dc-bounces@mailman.ccsds.org></span>
<br>
<hr noshade>
<br>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">Dear Aaron, dear
all,</span><span style=" font-size:12pt"> <br>
</span><span style=" font-size:10pt;font-family:sans-serif"><br>
Good catch Aaron.</span><span style=" font-size:12pt"> </span><span style=" font-size:10pt;font-family:sans-serif"><br>
My only question would be if we are not missing a definition for t>0
and D=3 in that case, in which k_z(t)=1 should be used according to Annex
F in the Green Book.</span><span style=" font-size:12pt"> </span><span style=" font-size:10pt;font-family:sans-serif"><br>
If not, I understand that by this change we force D=3 samples to be encoded
with low entropy codes only. In that case we should probably also change
Annex F and the Note in 5.4.3.3.5.1.4 to "When D<=3, the condition...".</span><span style=" font-size:12pt">
<br>
</span><span style=" font-size:10pt;font-family:sans-serif"><br>
Kind regards,</span><span style=" font-size:12pt"> <br>
</span><span style=" font-size:10pt;font-family:sans-serif"><br>
Roberto</span><span style=" font-size:12pt"> <br>
<br>
<br>
<br>
</span><span style=" font-size:8pt;color:#808080;font-family:sans-serif"><b><br>
ESA – European Space Agency</b></span><span style=" font-size:12pt"> </span><span style=" font-size:8pt;color:#00a1e0;font-family:sans-serif"><br>
Roberto Camarero</span><span style=" font-size:12pt"> </span><span style=" font-size:8pt;color:#808080;font-family:sans-serif"><br>
Onboard Payload Data Processing Engineer<br>
TEC-EFD / Electrical Engineering Department</span><span style=" font-size:12pt">
</span><span style=" font-size:8pt;color:#808080;font-family:sans-serif"><b><br>
ESTEC</b><br>
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NL-2200 AG Noordwijk, The Netherlands<br>
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Join us at the following upcoming event:</span><span style=" font-size:12pt">
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<br>
</span><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif"><br>
From: </span><span style=" font-size:9pt;font-family:sans-serif">"Kiely,
Aaron B (US 332B)" <aaron.b.kiely@jpl.nasa.gov></span><span style=" font-size:12pt">
</span><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif"><br>
To: </span><span style=" font-size:9pt;font-family:sans-serif">"sls-dc@mailman.ccsds.org"
<sls-dc@mailman.ccsds.org></span><span style=" font-size:12pt"> </span><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif"><br>
Date: </span><span style=" font-size:9pt;font-family:sans-serif">08/04/2021
12:52 AM</span><span style=" font-size:12pt"> </span><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif"><br>
Subject: </span><span style=" font-size:9pt;font-family:sans-serif">[SLS-DC]
123B2 Corrigendum</span><span style=" font-size:12pt"> </span><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif"><br>
Sent by: </span><span style=" font-size:9pt;font-family:sans-serif">"SLS-DC"
<sls-dc-bounces@mailman.ccsds.org></span><span style=" font-size:12pt">
<br>
</span>
<hr noshade><span style=" font-size:12pt"><br>
<br>
</span><tt><span style=" font-size:10pt"><br>
Dear Working Group,<br>
<br>
There is a minor issue with 123B2.<br>
<br>
The NOTE in 5.4.3.3.5.2 of 123B2 states that, “For high-entropy samples,
it can be shown that k_z(t)>=2.” In fact, as the standard is written
this isn’t true, it’s just extremely rare – it can only happen when
bit depth is D=3. (See Annex F of the Green Book.)<br>
<br>
We intended for the idea of this note to be normative, eliminating the
need to implement a code that would be used only for a very special case.
I believe we should request a corrigendum to do the following:<br>
1. In
5.4.3.3.5.2, change<br>
k_z(t) is the largest positive integer k_z(t)<=max{D-2,2},
such that…<br>
to<br>
k_z(t) is the largest integer 2<=k_z(t)<=max{D-2,2},
such that…<br>
2.
Delete the NOTE in 5.4.3.3.5.2.<br>
3. In
5.4.3.3.5.1.4, change<br>
For t>0…<br>
to<br>
For t>0 and D>3, …<br>
<br>
Please let me know if this looks right, and if we have consensus I’ll
forward this to the Editor and Area Director.<br>
<br>
Thanks,<br>
Aaron[attachment "smime.p7s" deleted by Roberto Camarero/estec/ESA]
<br>
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