[SLS-DC] 123B2 Corrigendum

[Gian.Paolo.Calzolari at esa.int]

Just an hint.
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.
Therefore you better check with Tom (cc'ed here) about this.

CIao

Gian Paolo
(Not AD :o)



From:   Roberto.Camarero at esa.int
To:     "Kiely, Aaron B (US 332B)" <aaron.b.kiely at jpl.nasa.gov>
Cc:     "sls-dc at mailman.ccsds.org" <sls-dc at mailman.ccsds.org>
Date:   04-08-21 09:52
Subject:        Re: [SLS-DC] 123B2 Corrigendum
Sent by:        "SLS-DC" <sls-dc-bounces at mailman.ccsds.org>



Dear Aaron, dear all, 

Good catch Aaron. 
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. 
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...". 

Kind regards, 

Roberto 




ESA – European Space Agency 
Roberto Camarero 
Onboard Payload Data Processing Engineer
TEC-EFD / Electrical Engineering Department 
ESTEC
Keplerlaan 1, PO box 299, 
NL-2200 AG Noordwijk, The Netherlands
roberto.camarero at esa.int | www.esa.int/tec/
T +31 71 56 53508 | F +31 71 56 56791 | Room: Da213 
Join us at the following upcoming event: 
2nd European Workshop on OnBoard Data Processing - OBDP2021 - 14-17 June 
2021 




From:        "Kiely, Aaron B (US 332B)" <aaron.b.kiely at jpl.nasa.gov> 
To:        "sls-dc at mailman.ccsds.org" <sls-dc at mailman.ccsds.org> 
Date:        08/04/2021 12:52 AM 
Subject:        [SLS-DC] 123B2 Corrigendum 
Sent by:        "SLS-DC" <sls-dc-bounces at mailman.ccsds.org> 



Dear Working Group,

There is a minor issue with 123B2.

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.)

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:
                1.    In 5.4.3.3.5.2, change
                                                  k_z(t) is the largest 
positive integer k_z(t)<=max{D-2,2}, such that…
                                 to
                                                  k_z(t) is the largest 
integer 2<=k_z(t)<=max{D-2,2}, such that…
                2.     Delete the NOTE in 5.4.3.3.5.2.
                3.    In 5.4.3.3.5.1.4, change
                                                  For t>0…
                                 to
                                                  For t>0 and D>3, …

Please let me know if this looks right, and if we have consensus I’ll 
forward this to the Editor and Area Director.

Thanks,
Aaron[attachment "smime.p7s" deleted by Roberto Camarero/estec/ESA] 
_______________________________________________
SLS-DC mailing list
SLS-DC at mailman.ccsds.org
https://mailman.ccsds.org/cgi-bin/mailman/listinfo/sls-dc


This message is intended only for the recipient(s) named above. It may 
contain proprietary information and/or
protected content. Any unauthorised disclosure, use, retention or 
dissemination is prohibited. If you have received
this e-mail in error, please notify the sender immediately. ESA applies 
appropriate organisational measures to protect
personal data, in case of data privacy queries, please contact the ESA 
Data Protection Officer (dpo at esa.int).
_______________________________________________
SLS-DC mailing list
SLS-DC at mailman.ccsds.org
https://mailman.ccsds.org/cgi-bin/mailman/listinfo/sls-dc




This message is intended only for the recipient(s) named above. It may contain proprietary information and/or
protected content. Any unauthorised disclosure, use, retention or dissemination is prohibited. If you have received
this e-mail in error, please notify the sender immediately. ESA applies appropriate organisational measures to protect
personal data, in case of data privacy queries, please contact the ESA Data Protection Officer (dpo at esa.int).

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.ccsds.org/pipermail/sls-dc/attachments/20210804/90a735c7/attachment.htm>