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Annex 7 to Doc. AVC-106R
Annex 7 to Doc. AVC-106R

LIAISON STATEMENTS TO TG CMTT/2


SOURCE : Expert Group for ATM Video coding
TITLE  : Liaison statement to  Task Group CMTT/2 concerning 
         requirements for secondary TV and HDTV distribution 
PURPOSE: For action

At the third meeting of the CCITT SG XV Experts Group for ATM Video coding 
held in Santa Clara (USA), the Liaison Statement from the Special Rapporteur 
of Task Group CMTT/2 for Secondary distribution of digital TV and HDTV 
signals was discussed.  Special attention was given to the annex of the 
Liaison Statement containing the Preliminary Requirements for secondary 
distribution of TV and HDTV signals.

As a result of the discussions the Expert Group brings to the attention of 
the Task Group CMTT/2 the following:

1.	The phenomena of channel hopping, frequently carried out in TV 
broadcast services, may impose particular requirements on the systems 
used for these services.  It is therefor suggested to take these 
requirements also into account in updating the text for the 
functional requirements for secondary distribution of TV and HDTV 
signals. 

2.	It is the view of the Experts Group for ATM Video Coding that the 
foreseen integration of services in a B-ISDN environment will desire 
terminals (H.32x) which could handle both signals coming from a H.26x 
codec and signals coming from digital TV and HDTV distribution codecs.  
The implication of a level of compatibility amongst both may be a 
requirement to consider.

See Figure in the attached list of H.26X requirements.

3.	To enable a better understanding of the requirements of systems for 
secondary distribution of digital TV and HDTV signals it is considered 
useful to provide a reference configuration from the source to the 
receiver.  We would like to study the commonality of the secondary 
distribution service terminal and our H.32X terminal for communication 
purposes.


Attachment: H.26X requirements (Annex 5 of this report)
SOURCE : Expert Group for ATM Video coding
TITLE  : Liaison statement to  Task Group CMTT/2 concerning
         harmonisation of the work 
PURPOSE: For action

In the interest of service integration all terminals should be capable of 
handling different signals.  It is therefor strongly desirable that CMTT, 
CCITT and ISO/IEC jointly develop an appropriate video coding method.

This process is already under way between CCITT and ISO/IEC and joint 
meetings have been held.  An overall list of requirements have been 
identified and preliminary assessments and test procedures devised.

CCITT SG XV Experts Group for ATM Video Coding is of the opinion that an 
increased level of participation of TG CMTT/2 at all meetings is highly 
desirable.


END