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<p class="MsoNormal">Hi Aaron, <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Is it correct to assume for D=3 case defined in current definition
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">k_z(t)=2</span>, although rare, the compression is not optimal under the high entropy mode? Or, possibly not compressing?<o:p></o:p></p>
<p class="MsoNormal">I agree with the changes proposed to put D=3 to be all low entropy samples if high entropy condition is rare. Also, I agree the note in
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">5.4.3.3.5.1.4 needs to be updated as well.</span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Best,<b><i><span style="font-size:10.0pt;font-family:"Calibri Light",sans-serif;color:black"><o:p></o:p></span></i></b></p>
<p class="MsoNormal"><b><i><span style="font-size:10.0pt;font-family:"Calibri Light",sans-serif;color:black">Mark Wong</span></i></b><span style="font-size:10.0pt;font-family:"Calibri Light",sans-serif;color:black">
<o:p></o:p></span></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt;font-family:"Calibri Light",sans-serif;color:black">NASA GSFC Flight Microwave & Telecommunication Systems Branch<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt;font-family:"Calibri Light",sans-serif;color:black">Phone: 1-301-286-6549
<o:p></o:p></span></i></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> SLS-DC <sls-dc-bounces@mailman.ccsds.org> <b>On Behalf Of
</b>Gian.Paolo.Calzolari@esa.int<br>
<b>Sent:</b> Wednesday, August 4, 2021 4:26 AM<br>
<b>To:</b> Roberto.Camarero@esa.int<br>
<b>Cc:</b> sls-dc@mailman.ccsds.org; SLS-DC <sls-dc-bounces@mailman.ccsds.org><br>
<b>Subject:</b> [EXTERNAL] Re: [SLS-DC] 123B2 Corrigendum<o:p></o:p></p>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Just an hint.</span>
<br>
<span style="font-size:10.0pt;font-family:"Arial",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:10.0pt;font-family:"Arial",sans-serif">Therefore you better check with Tom (cc'ed here) about this.</span>
<br>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">CIao</span> <br>
<br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">Gian Paolo</span> <br>
<span style="font-size:10.0pt;font-family:"Arial",sans-serif">(Not AD :o)</span> <br>
<br>
<br>
<br>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F">From: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif"><a href="mailto:Roberto.Camarero@esa.int">Roberto.Camarero@esa.int</a></span>
<br>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F">To: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">"Kiely, Aaron B (US 332B)" <<a href="mailto:aaron.b.kiely@jpl.nasa.gov">aaron.b.kiely@jpl.nasa.gov</a>></span>
<br>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F">Cc: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">"<a href="mailto:sls-dc@mailman.ccsds.org">sls-dc@mailman.ccsds.org</a>" <<a href="mailto:sls-dc@mailman.ccsds.org">sls-dc@mailman.ccsds.org</a>></span>
<br>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F">Date: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">04-08-21 09:52</span>
<br>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F">Subject: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">Re: [SLS-DC] 123B2 Corrigendum</span>
<br>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F">Sent by: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">"SLS-DC" <<a href="mailto:sls-dc-bounces@mailman.ccsds.org">sls-dc-bounces@mailman.ccsds.org</a>></span>
<o:p></o:p></p>
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<span style="font-size:10.0pt;font-family:"Arial",sans-serif">Dear Aaron, dear all,</span><span style="font-size:12.0pt">
<br>
</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><br>
Good catch Aaron.</span><span style="font-size:12.0pt"> </span><span style="font-size:10.0pt;font-family:"Arial",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:12.0pt">
</span><span style="font-size:10.0pt;font-family:"Arial",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:12.0pt">
<br>
</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><br>
Kind regards,</span><span style="font-size:12.0pt"> <br>
</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><br>
Roberto</span><span style="font-size:12.0pt"> <br>
<br>
<br>
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ESA – European Space Agency</span></b><span style="font-size:12.0pt"> </span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#00A1E0"><br>
Roberto Camarero</span><span style="font-size:12.0pt"> </span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:gray"><br>
Onboard Payload Data Processing Engineer<br>
TEC-EFD / Electrical Engineering Department</span><span style="font-size:12.0pt">
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From: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">"Kiely, Aaron B (US 332B)" <<a href="mailto:aaron.b.kiely@jpl.nasa.gov">aaron.b.kiely@jpl.nasa.gov</a>></span><span style="font-size:12.0pt">
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F"><br>
To: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">"<a href="mailto:sls-dc@mailman.ccsds.org">sls-dc@mailman.ccsds.org</a>" <<a href="mailto:sls-dc@mailman.ccsds.org">sls-dc@mailman.ccsds.org</a>></span><span style="font-size:12.0pt">
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F"><br>
Date: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">08/04/2021 12:52 AM</span><span style="font-size:12.0pt">
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F"><br>
Subject: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">[SLS-DC] 123B2 Corrigendum</span><span style="font-size:12.0pt">
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F"><br>
Sent by: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">"SLS-DC" <<a href="mailto:sls-dc-bounces@mailman.ccsds.org">sls-dc-bounces@mailman.ccsds.org</a>></span><span style="font-size:12.0pt">
</span><o:p></o:p></p>
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<tt>Dear Working Group,</tt><br>
<br>
<tt>There is a minor issue with 123B2.</tt><br>
<br>
<tt>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.)</tt><br>
<br>
<tt>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:</tt><br>
<tt> 1. In 5.4.3.3.5.2, change</tt><br>
<tt> k_z(t) is the largest positive integer k_z(t)<=max{D-2,2}, such that…</tt><br>
<tt> to</tt><br>
<tt> k_z(t) is the largest integer 2<=k_z(t)<=max{D-2,2}, such that…</tt><br>
<tt> 2. Delete the NOTE in 5.4.3.3.5.2.</tt><br>
<tt> 3. In 5.4.3.3.5.1.4, change</tt><br>
<tt> For t>0…</tt><br>
<tt> to</tt><br>
<tt> For t>0 and D>3, …</tt><br>
<br>
<tt>Please let me know if this looks right, and if we have consensus I’ll forward this to the Editor and Area Director.</tt><br>
<br>
<tt>Thanks,</tt><br>
<tt>Aaron[attachment "smime.p7s" deleted by Roberto Camarero/estec/ESA] </tt><br>
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