Subject: Local insertion of leap seconds
I am new to this group so please excuse if this subject has been
previously covered.
As I understand the standard ITU-R TF.460-6 the leap second correction
is instantiated globally as the last second of a UTCZ month.
However I have not been able to determine any practices for
instantiating the leap second correction at other times to avoid such an
interruption in the timescale at an inopportune time of day in different
locations around the world.
In countries west of Greenwich the insertion happens before midnight
making possible to delay the correction to a later and more appropriate
time. However in countries east of Greenwich the correction could need
to have sufficient advance notice.
Can you enlighten my understanding of what practices may exist?
Background for these concerns is compounded by a number of factors.
1.)Television broadcast automation requires precise timing to avoid
programs and in particular commercials from being clipped or having gaps.
2.)Video in North America and some other parts of the world is generated
on a timescale that is at a frequency of 30/1.001 Hz. This deviation
from a SI second timescale means that a leap second insertion is
equivalent to inserting 29.97002997... video frames.
3.)This rate implies in a non-integer number of video frames in a 24
hour day and thus a varying phase alignment to a 24 hour clock.
Regards
Stephen
--
*Stephen Scott*
Skotel Corporation
Brossard, Québec
Canada
Mobile: +1 514-806-2340
Skype: SScott2645
Email: [email protected]
---
This email is free from viruses and malware because avast! Antivirus protection
is active.
http://www.avast.com
_______________________________________________
LEAPSECS mailing list
[email protected]
http://six.pairlist.net/mailman/listinfo/leapsecs
