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Document AVC-318R
CCITT SGXV                                            	Document AVC-318R
Working Party XV/1                        			July 10, 1992
Experts Group for ATM Video Coding				

SOURCE : CHAIRMAN OF THE EXPERTS GROUP FOR ATM VIDEO CODING
TITLE  : REPORT OF THE SEVENTH MEETING IN NEW JERSEY AND RIO DE 
         JANEIRO (July 1-10, 1992) - PART II
Purpose: Report

-----------------

PART II  JOINT SESSIONS

Contents

		   1.	Introduction
		   2.	REQUIREMENTS sub-group
		   3.	TESTS sub-group
		   4.	VIDEO sub-group
		   5.	SYSTEMS sub-group
		   6.	IMPLEMENTATION STUDIES sub-group
		   7.	Meeting on very low bitrate audio-visual 
			video coding study


1. Introduction

Joint sessions with ISO/IEC JTC1/SC29/WG11 (MPEG) were held in Rio de 
Janeiro at the kind invitation of ABNT (Associacao Brasileira de Normas 
Tecnicas) during 6-10 July 1992.  At the opening session on 6 July, Mr. Raul 
Colcher, Chairman of the Brazilian JTC1 Committee, welcomed the CCITT 
Experts Group.  The Experts Group appreciated the support and hospitality 
of the hosting organization.

A list of documents considered during the joint sessions is attached to this 
report as Annex 1.


2. REQUIREMENTS sub-group (by S. Okubo)

2.1 General

The REQUIREMENTS Group met as follows during the week;

	Mon (6 July)	evening	joint with VIDEO
	Tue (7 July)	morning	joint with VIDEO
	Tue (7 July)	morning	joint with SYSTEM
	Tue (7 July)	afternoon	independent
	Wed (8 July)	afternoon	independent
	Wed (8 July)	afternoon	joint with AUDIO
	Thu (9 July)	morning	independent
	Thu (9 July)	afternoon	independent
	Fri (10 July)	morning	joint with VIDEO

The major tasks were to finalize the "guide for video work" and to formulate 
requirements listing for system and audio.

2.2 Documentation

REQUIREMENTS group reviewed the following contributions;

223     US NB           USNB resolution for consideration by ISO/IEC 
                        JTC1/SC29 Working Group 11
234     ANSI            MPEG Lossless compression
235     AUS NB          Comments to Haifa resolutions
237     UNINFO          Opinions on questions contained in ISO/IEC 
                        JTC1/SC29/WG11 N0201
247     CCITT/J         H.261 compatibility requirements
263     Sugiyama        Consideration about multi picture formats
264     Hidaka          Study about the compatibility toward to MPEG3
280     ITSCJ           Resolutions of Japanese National Body
294     CCIR            Appointment of a Special Rapporteur on Study Groups 
                        10, 11 and CMTT applications requirements for 
                        digital source
295     Convenor        Generic audiovisual coding - A proposal for 
                        international multi-organisation collaboration
302     SC29            Project description format
316     CCIR            Establishment of Task Group 11/4 on Harmonisation 
                        of HDTV standards between broadcast and non-
                        broadcast applications and its first meeting to be 
                        held in Washington, D.C. (October 1992)
318     Bourguignat     User requirements for secondary distribution
320     CMTT            Liaison letter from CMTT/2-SRG to ISO/IEC 
                        JTC1/SC29/WG11 (MPEG)
321     CMTT            Report of the activities of the group of experts 
                        assisting the special rapporteur
322     ANSI            Comments on MPEG-2 Video requirements
327     Curet et al.    Addition of conditional access to the MPEG System 
                        layer 
328     Ziegler         Stereoscopic imaging - Work done within COST 230 
                        and RACE DISTIMA
338     ANSI            MPEG 2 project description
347     BSI             UK National Body Comment on the 18th ISO/IEC 
                        JTC1/SC29/WG11 meeting resolutions (Haifa Meeting)
348     BSI             UK National Body Comment on the MPEG Requirements 
                        documents
376     SF NB           Comments to Resolutions of  Haifa meeting
385     DIN             Comments to the resolutions of the Haifa meeting
386     AFNOR           French contribution on SC29/WG11 Work
387     KBS             Opinions on some resolutions of ISO/IEC 
                        JTC1/SC29/WG11 Haifa meeting of March 1992
392     Kunt            Letter to Convenor 
393     Hepper          Application profile for hierarchical TV/HDTV 
                        broadcasting 
407     CCIR            Statement concerning user requirements for source 
                        coding and multiplexing for broadcasting 
                        applications

2.3 Lossless video coding

In the joint discussion with VIDEO group, the following clarifications were 
made (see the VIDEO report for more details);

    -	Lossless coding in the sense of reversible coding can not be provided 
by the current algorithm.
    -	Very high quality in the sense of near lossless coding should be 
provided by the current algorithm.

2.4 Removal of "about 10 Mbit/s" upper bound from the MPEG-2 title

The REQUIREMENTS Group discussed the subject and related matters in the 
afternoon of July 7.  These discussions were based on the discussions during 
the joint VIDEO/REQUIREMENTS sessions in the evening of July 6 and the 
morning of July 7.  Items of the members concern were;

    -	Implications of removal on requirements of MPEG-2
    -	Question of adding HDTV as a specific requirement
    -	Impact of the removal on the time schedule 

After extensive discussion, the REQUIREMENTS Group concluded as follows,

1)	The current upper bound of "around 10 Mbit/s" should be removed from 
the title and the requirements listing (MPEG92/229,230) for the following 
reasons;

   a.	It provides for CCIR-601 but precludes coding of several formats with 
much higher resolutions.

   b.	Even CCIR-601 formats may require higher bit rates than 10 Mbit/s to 
achieve very high quality.

   c.	MPEG-1 supports a wide range of bit rates, this standard will also 
support a wide range of bit rates.

2)	MPEG-2 should provide sufficient hooks in the syntax for extension to 
higher formats such as EDTV, HDTV and SDTV; e.g. identification of these 
formats, possibility of use of dedicated tables for each format. 

3)	The current time schedule agreed to in Haifa must remain unchanged.

4)	For coding of HDTV, a new work item should be established and 
definition of requirements should be initiated.  The following 
functionalities of hierarchical coding have been identified as essential for 
HDTV broadcasting by several contributions;

   a.	Graceful degradation according to received signal strength,
   b.	Upward/downward compatibility with conventional TV.

	Note - The first sentence was reworded at the plenary on Wednesday as 
follows; "For coding of HDTV, using the hooks defined in 4), additional 
work is needed with corresponding requirements and schedule."

2.5 Guide for the video work - revision of MPEG92/230 (AVC-259)

At the start of the discussion, the meeting clarified the purpose of the two 
documents (the video requirements listing in MPEG92/229 and the guide for 
the video work in MPEG92/230) as follows;

    -	MPEG92/230 should describe normative parts of the requirements so 
that the standard development can be checked against this document.
    -	MPEG92/229 should describe informative parts of the requirements.  The 
title should be modified to reflect this clarification.

Historically, the guide for the video work has been extracted from the 
general requirements listing.  Since it is urgent to provide a crisp 
description on what are required for the video standard, however, the 
meeting did best efforts to complete this document during the week.  By 
studying carefully item by item and considering comments from National 
Bodies and other organizations/individuals, the meeting produced a "Rio 
version" of the guide for the video work.

This revised version was reviewed and agreed to at the joint meeting with 
VIDEO in the Friday morning.  The content of this document will be used as 
yardsticks when the video specifications are frozen in March 1993.

2.6 Information on requirements for MPEG-2 video 
    - revision of MPEG92/229 (AVC-258)

The meeting reviewed this document to reflect several comments from 
National Bodies and other organizations/individuals and to make alignments 
with the above mentioned guide for the video work.  Rio version was 
produced as the outcome of this work.  Due to the lack of time, however, the 
meeting felt it necessary to make further editorial improvements.  This will 
be finished by the next meeting by an adhoc group which also takes care of 
the integration of requirements for System, Video and Audio.

2.7 Requirements for MPEG-2 System

REQUIREMENTS group assisted SYSTEM group to formulate requirements for 
the current phase of work on such items as multiple program or component 
multiplexing, error resilience.  See the SYSTEM report for more details.

2.8 Requirements for MPEG-2 Audio

REQUIREMENTS group assisted AUDIO group to formulate requirements for the 
current phase of work.  See the AUDIO report for more details.

2.10 Adhoc group for requirements listing

Toward producing an integrated requirements listing document for System, 
Video and Audio, editorial work is continued till the next meeting in 
November by the adhoc group.

2.11 Response to National Body position papers

Based on the study during the week, REQUIREMENTS Group drafted the 
responses to US, UK and German National Bodies for approval of the Plenary.

2.12 Recommendations of the group

As conclusion of the one week discussion, the following Recommendations 
were drafted for consideration of the Plenary;

1)	The guide for video as revised in MPEG92/230 (revised on July 10, 1992) 
should be applied to the work of video coding standard development.

2)	Integration of the requirements listing for system, video and audio 
should be worked out by an adhoc group before the next meeting, based on 
the achievements obtained during this meeting.

3)	WG11 should produce an MPEG-2 project description according to the 
format proposed in MPEG92/338.

4)	Upper bound of "about 10 Mbit/s" in the MPEG-2 title should be 
removed.  MPEG-2 should provide means for extension to higher resolution 
formats than CCIR-601.

5)	The current time schedule agreed to in Haifa should remain unchanged.

6)	MPEG-2 should not seek to provide for lossless coding in the sense of 
reversible coding, but it should provide for very high quality (near 
lossless) by selecting parameters.


3. TESTS sub-group (by S. Okubo)

Based on the work of the adhoc group which had been established at the 
Haifa meeting, the following sequences were selected;

  Title                          Length   Source         Remarks
  ------------------------------------------------------------------------
  Fountain and Rainbow (CG)      5 sec    T. Hidaka      Computer graphics
  Marbles                        5 sec    T. Hidaka      Stress material
  Bus Crossing Columbus Circle   5 sec    VIACOM         CCD shutter 1/250
  Carousel                       5 sec    VIACOM         Beta SP 2/250
  Confetti                       4 sec    VIACOM         Composite
  Ballet                         5 sec    Hughes (Kodak) Component


It is noted that the following sequences had already been selected at Haifa;

  Title                          Length   Source         Remarks
  ------------------------------------------------------------------------
  Football                       5 sec    CCIR Library   New portion
  Cheer Leader                   5 sec    CCIR Library   Quick motion
  Bicycle                        5 sec    CCIR Library   Quick motion     
  Prl Car                        5 sec    J. Morris      Stress material
  Hockey                         5 sec    B. Haskell     Quick motion

New test sequences will be distributed by Exabyte tapes through the three 
regional coordinators; N. Wells (Europe), D. Mead (North America) and J. 
Yonemitsu (Far East).  

Chair of TEST sub-group, Mr. Hidaka, will prepare a letter to copyright 
holders of these test sequences asking permission for MPEG members to use 
those materials for their internal research work in support of the current 
phase of standardization work.


4. VIDEO sub-group (by G. Bjoentegaard)

4.1 General

The VIDEO group met as a whole group, jointly with REQUIREMENTS, SYSTEMS 
and IMPLEMENTATION as well as in subgroups.  Brief reports from the 
subgroups are given below with special emphasis on the items of interest for 
CCITT.

4.2 Prediction modes

In this group both coding structure (frame based, field based) and 
prediction modes were dealt with.  The pure field structure was removed 
from the TM.  The frame based frame and field coding remain and they should 
satisfy the needs both from compatibility and low delay point.  Some new 
prediction modes that could be of interest specially for low delay was 
included as core experiments (SVMC, DUAL').

4.3 Compatibility

Extended core experiments were proposed.  Some of them intend to cross 
check the merits of different techniques.  Core experiments were also 
defined for compatibility with H.261 and higher formats (e.g. HDTV).  A 
modification of the syntax to use field structure for compatibility was made 
in the TM.

4.4 Cell loss

Although not stated in the requirements, the group expressed interest in 
checking cell loss performance for high loss rates (up to 10E-2).  The core 
experiments defined in TD6 from CCITT were adopted.

4.5 Quantization

Core experiments were defined to perform test of the following items:

    -	Weighting matrices.
    -	Scanning of coefficients.
    -	Quantization (e.g. increase upper limit of reconstructed coefficients 
from 256 to 2000).
    -	Other transforms than 2D DCT.  8*1 DCT and NTC (Non Transform Coding) 
will be examined.

4.6 Scalability

The following items will be addressed in core experiments:

    -	Pyramid/subband approach.
    -	Coefficient scanning.
    -	Interlace/interlace extraction problems.
    -	Drift corrections.

4.7 Adhoc groups

To perform work in all these areas until the next meeting the following 
adhoc groups were formed:

	Editorial            		A. Koster
	Prediction           		H. Watanabe
	Scalability          		E. Viscito
	Compatibility        		A. Puri
	Quantization         		N. Wells
	ATM and error resilience	M. Biggar
	Low delay                	T. Yukitake


5. SYSTEMS sub-group (by B.G. Haskell)

The SYSTEMS Committee of MPEG has shrunk considerably in size as the topics 
for discussion become more general.  This should change as specific 
implementational aspects of the various applications begin to be studied.

The current list of MPEG2 Systems Requirements includes...
	
1) Scalability of Audio and Video
2) Robustness to bit errors and cell loss
3) MPEG1/H.261 backward compatibility
4) Trick modes for VCRs
5) Multichannel Audio/Language
6) Multiprogram with Adaptive Multiplexing
7) Switching Bitstreams, such as Channel Hopping
8) Indication Signals for Stream Inter-Relationships
9) Encryption/Scrambling, such as Conditional Access
10) Editing of Distribution Format
11) Broadcast Applications

All were discussed to some extent.  However, more time was spent on items 5, 
8, 9 and 11.  Some preliminary arrangements for language specification were 
spelled out.  Contributions were studied for various levels of conditional 
access, which are also being studied by the CCITT.  Special broadcast 
requirements were discussed, and an ad hoc Committee on Broadcast 
Requirements was formed with B.G. Haskell as chair.


6. IMPLEMENTATION STUDIES sub-group (by D.G. Morrison)

6.1 General

The group met several times during the week.  The participants at the first 
session were:

Cliff Reader, Cypress Semiconductor
Kwok Chau, LSI Logic
Marco Gandini, CSELT
Doug Bailey, Integrated Systems Technology
Jim Williams, Hughes
John Gooding, Inmos/SGS Thomson
Colin Smith, Pioneer Digital Design
Sam Narasimhan, Institute of Microelectronics, Singapore
Eiichi Kowashi, Intel
Toshio Nagata, Texas Instruments
Ben Yung, Apple Computer
Elio Pithon Saryo Fo., IPgD-Telebras
Sergio Csnesiu Collocci, CpgD-Telebras
Geoff Morrison, BT Labs (chair)

6.2 Discussion

1)	We discussed document MPEG92/350 which investigated the hardware 
complexity of various predictors.  This prompted recommendations 1 and 2 
about FAMC.

2)	In the context of predictors, the idea of downloadable predictors as 
proposed in MPEG92/285 did not find favour mainly because of the possible 
large RAM overhead for the decoder's table.  Recommendation 3 expressed 
our preference that this should not be added to the Test Model.

3)	Document MPEG92/388 considered the implementation aspects of a 
Modified Universal Variable Length Coder.  Some participants were of the 
opinion that a simpler implementation could be possible.  Recommendation 4 
reflected this.

4)	Some implementation problems are eased when the number of coded bits 
per block is not unduly high.  In recommendation 5 we requested experiments 
to see the affect of setting maximum numbers of 256 and 512.

5)	Recommendation 6 was prompted by the desire to be able to find 
picture start codes directly in the System multiplex.

6)	Some implementers favoured simplification of the TM syntax.  
Recommendations 7, 8 and 9 requested the video group to investigate the 
affect on coding performance of removal of MBA and CBP and a having a new 
VLC for coefficients.

7)	We held a joint meeting with proponents of scalability in the 
frequency domain.  This led to recommendations 10 and 11.  We also held a 
joint meeting with proponents of scalability and compatibility in the spatial 
domain.  We decided to establish an ad-hoc group to study further 
hierarchical schemes using frequency and spatial domain methods 
(recommendation 12).

8)	We participated in a joint meeting with Systems and Video on the 
subject of multiplexing strategy for layered coding.  We expressed a small 
but positive preference for such multiplexing to be performed at the System 
level and not as part of the video multiplex.

9)	We decided not to meet again before the London meeting in November.

6.3 Recommendations of IMPLEMENTATION STUDIES Group, Angra dos Reis

1)	FAMC B predictions using average mode should be removed from the TM.

2)	FAMC weighting factors should be multiples of 1/8.

3)	Downloadable predictors should not be added to the TM.

4)	The MUVLC warrants further complexity study.  (The coder may be less 
complex than suggested in MPEG 92/388).

5)	Core experiments are requested to assess the affect of restricting the 
maximum number of bits per block to 256 and 512.  In these experiments 
trailing coefficients should be forced to zero and these modified values 
used in reconstructing predictions.

6)	For video editing it is desirable that picture start codes can be 
detected directly in the System byte stream.  This is facilitated by these 
codes not being interrupted by System headers.  We request the SYSTEMS 
group to propose mechanisms to achieve this with the intention of making it 
a normative requirement.

7)	We support the non-use of skipped macroblocks in the TM.  We would 
support the deletion of MBA.  At the beginning of slices the horizontal 
position should be indicated.  Experiments are requested.

8)	We request the VIDEO Group to perform core experiments to test the 
effect of deletion of CBP from the TM.

9)	The VIDEO group should re-examine the coefficient VLC table with a 
view to simplification eg removal of the two stage escape mechanism and the 
first/next coefficient mechanism.

10)	Scalability in frequency domain.  We note that the schemes under 
investigation by the VIDEO group range from those which are only marginally 
more complex than non-scalable to those which are significantly more 
complex (more memory, more memory bandwidth, more quantisation and 
transform computations.)  We expect that only those schemes which are 
competitive with simulcast have a chance of being incorporated in the 
standard.  We request the VIDEO group to identify these and provide clear
information on them.  (MPEG 92/288 is a good example).  This information is 
requested by 14 Aug 92.

11)	We confirm that bi-linear interpolation using multiples of 1/8 to 
effect higher precision motion vectors in lower layers using half pel 
resolution vectors from a higher layer does not add significant complexity.

12)	We recommend the establishment of an ad-hoc group on implementation 
aspects of scalability and compatibility.


7. Meeting on very low bitrate audio-visual video coding study (by G. Eude)

A group chaired by Mr K. O' Connor met to have a preliminary discussion 
about audio-visual coding at very low bitrate (about 10 kbit/s) and to draft 
the ad-hoc group mandate.  More than 25 people, many from the CCITT EG, 
attended this meeting.  

On the basis of the US National Body contribution (MPEG92/233), audio-video 
coding techniques and possible applications were reviewed.  Two target 
dates for this study have been mentioned, near-term solution (~2 years) and 
long-term solution (~5 years).  The study should be subdivided into video 
compression algorithm, audio compression algorithm, system multiplex 
specifications, requirements and implementations.  During the discussion, 
some participants mentioned the fact that the standardization of audio-
visual terminals for communications is relevant to CCITT.  

In conclusion, the mandate of the ad-hoc group on very low bitrate audio-
visual coding study is "to perform a study to produce a new project (NP)" by 
November 92 (London meeting).  CCITT EG members were invited to join this 
group on a individual basis.


END
Annex to AVC-318R

List of documents for the Rio de Janeiro joint sessions

	Note:	* indicates that the content of the document is also covered by 
		AVC-numbered document.

MPEG92/
233	ANSI			Contribution on very-low bitrate audiovisual coding
234	ANSI			MPEG Lossless compression
235	AUS NB		Comments to Haifa resolutions
236	ITSCJ			Resolutions of the Japanese National Body
237	UNINFO		Opinions on questions contained in ISO/IEC 
				JTC1/SC29/WG11 N0201
238	IPQ			Video coding at 10 kbit/s and applications
239	Kirby			Cooperation CCIR-ISO/MPEG-Audio
240*	CCITT SGXV		Liaison statement to ISO/IEC JTC1/SC29
241	Chinen et al.	Field/Frame DCT coding and Zigzag/Vertical scanning
242	Kameyama		Some Modification of Rate Control of TM1
243	Kameyama		Simulation Results
244	Iwahashi et al.	Tape Demonstration of Frequency Scaling Decoder
245	HITACHI 		Simulation results on TM1 core experiment
246	Nakajima		Simulation results of TM1 core experiment
247*	CCITT/J 		H.261 compatibility requirements
248*	CCITT/J		Scene change handling in low delay mode
249*	Yukitake		Simplification of FAMC
250*	Yukitake		The comparison of numbers of operations between 
				adaptive field/frame and simplified FAMC
251*	Japan MPEG		The estimation of coding and decoding delay and 
				number of required field memorys for predictions in 
				TM1
252	Takahashi		Proposal of Global Motion Compensation
253	Takahashi		Scalability achieved in Decoder
254	Noguchi et al.	Comparison between FAMC and frame/field/dual-field 
				prediction
255	Fukuhara et al.	Improvement of Dual field prediction and its coding 
				gain
256	BTA			Results on Basic Duality Subjective assessment for 
				conventional Television Secondary Distribution
257*	Ueno et al.		Simulation result on compatibility
258	Odaka			Comparison among three prediction structures in TM1
259	Odaka et al.	Improvement of dual field prediction method in TM1
260	Sugiyama		Results of TM1 core Experiments
261	Sugiyama		Proposal for core Experiments
262	Sugiyama		Results and Proposal for low delay coding
263	Sugiyama		Consideration about multi picture formats
264	Hidaka		Study about the compatibility toward to MPEG3
265	Matsuda		Comparison between prediction schemes
266	Nagata et al.	Comparison of Field-Time Adjusted MC and Frame 
				Field Adaptive MC
267*	Nogaki		Studies on Low Delay Coding
268	Nogaki		Comparison between FAMC and Frame/Field MC
269	Hanamura		Result of SNR scalability experiment
270	Sato et al.		Simulation results of TM1:Frame/Field structure 
				coding
271	Okazaki et al.	Simplification of TM1:Frame/Field structure coding
272	Kato et al.		Comparison of Frame_structure/Field_structure/ 
				Pure_field coding in TM1
273	Suzuki et al.	Proposal of Adaptive Frame/Field structure for core 
				experiments
274	Okazaki et al.	Simulation results of Quantization
275	Kato et al.		Proposal of Adaptive DCT/NTC coding
276	Okazaki et al.	Simulation results of Input Format
277	Obikane et al.	Results of Scalability experiments
278	Japan MPEG		Prediction and Motion Compensation in TM1
279	Japan MPEG		Summary of TM1 Core Experiments in Japan
280	ITSCJ			Resolutions of Japanese National Body
281	Nocture		Results on TM1 from the VADIS European 
				collaboration
282*	PTT Research	TM1 experiments
283	Nokia			Comparison of prediction modes
284	UH/FI			Experiments with TM1
285*	Bjoentegaard	Flexible encoder defined predictions
286	Corset		Evaluation of new prediction modes
287	Siemens 		Experiment 1 of the scalability annex of TM1
288	DTB			Multiple loop decoder for TM1 scalable mode
289*	Schamel et al.	Frequency scanning with MUVLC
290	LER			Frequency scanning with ACVLC
291*	BT			TM1 compatibility experiments
292*	PTT Research	TM1 hierarchical coding/compatibility vs simulcast
293	Koster		Improvement of TM1 syntax with respect to 
				compatibility
294	CCIR			Appointment of a Special Rapporteur on Study 
				Groups 10, 11 and CMTT applications requirements for 
				digital source
295	Convenor		Generic audiovisual coding - A proposal for 
				international multi-organisation collaboration
296	JTAG2			Minutes of the meeting of JTAG2, held in Geneva, 
				1992-06-02/04
297	JTC1			Summary of voting on document JTC1 N1779, revised 
				title, area of work and programme of work for 
				ISO/IEC JTC1/SC29
298	Ainsworth		Report of the ISO/IEC JTC1/SWG-P ad hoc group on 
				teleconferencing/electronic messaging
299	SC29			Resolutions adopted during the second plenary of 
				ISO/IEC JTC1/SC29 in Haifa, Israel, 1992 March 30, 31 
				and April 1
300	SC29			Proposal for a workshop on Multimedia/Hypermedia
				standardisation
301	SC29			Letters concerning ISO/IEC DIS 11172-1
302	SC29			Project description format
303	Gonzales		Ad-hoc group on experiments with the scalability 
				requirements
304	Puri			Ad-hoc group on experiments with the compatibility
				requirements
305	Wells			Ad-hoc group on quantisation experiments
306	Haskell		Ad-hoc group on conformance testing for CD11172
307	Reader		Ad-hoc group on CD editing
308	Hidaka		Ad-hoc group on MPEG-2 video test sequences
309	Morrison		Ad-hoc group on implementation considerations of 
				TM1
310	Pan	Ad-hoc group on audio software simulation
311	Koster	Ad-hoc group on Test Model editing and Core 
		experiments
312*	PTT Research	Error sensitivity of the TM1 syntax
313*	PTT Research 	TM1 pyramid coding for the scalability requirements
314*	PTT Research 	ATM cell loss experiments with TM1
315	DSM/Chair	Sub Group Chairman's report for DSM Sub Group
316	CCIR	Establishment of Task Group 11/4 on Harmonisation 
		of HDTV standards between broadcast and non-
		broadcast applications and its first meeting to be 
		held in Washington, D.C. (October 1992)
317	Sebestyen	Status of work in CCITT SG VIII with regards to JPEG, 
		JBIG, MPEG
318	Bourguignat	User requirements for secondary distribution
319	CCIR 	Tentative schedule of preparation of 
		recommendations considered in WPs and TGs
320	CMTT	Liaison letter from CMTT/2-SRG to ISO/IEC 
		JTC1/SC29/WG11 (MPEG)
321	CMTT	Report of the activities of the group of experts
		assisting the special rapporteur
322	ANSI	Comments on MPEG-2 Video requirements
323*	CCITT/AUS	Cell loss characteristics for statistically 
		multiplexed video sources
324*	CCITT/AUS	The ATM adaptation layer for video services in the 
		B-ISDN
325*	CCITT/AUS    	Adapting MPEG 1 video for ATM transmission
326* 	CCITT/AUS    	Proposal for cell loss core experiments on layered 
		and non-layered coders
327  	Curet et al.    	Addition of conditional access to the MPEG System 
		layer
328 	Ziegler         	Stereoscopic imaging - Work done within COST 230 
		and RACE DISTIMA
329	Chiang	Results of compatibility experiments of MPEG1 field 
		coding in a 3-layer structure
330	Yu    	Allowing reverse order of field coding in field-
		structured frame-sequences
331	Savatier      	CD 11172 rev 2, Video: Comments and clarifications
332	Savatier      	Syntax modifications for the coded block pattern in 
		4:2:2 sequences
333  	Savatier      	Alternate search method for FAMC motion vectors
334  	Savatier        	Field reordering in pure-field- sequences for FAMC 
		prediction
335  	Savatier    	Simulation results on prediction modes and 
		Field/Frame DCT coding
336   	Savatier        	Simplification of the coding of Field-based MV in 
		Test Model
337* 	Bjoentegaard  	Simulations with field coding and M=1 for low delay
338   	ANSI            	MPEG 2 project description
339  	Holtzman        	Amplitude Scalability experiments
340*	Aravind et al.  	Modifications to TM1 to suit Broadcast Applications
341 	Aravind et al.  	Report on core experiments on temporal prediction 
		modes
342* 	CCITT/J 	Cell loss compensation scheme
343* 	DSRC            	VBR MPEG bit-rate characteristics
344* 	DSRC            	Error concealment for MPEG Video over ATM
345* 	CCITT/J 	Comparison of prediction methods of the low delay 
		mode of TM1
346  	Sugiyama        	Call for participation in audio bitstream exchange
347  	BSI            	UK National Body Comment on the 18th ISO/IEC
		JTC1/SC29/WG11 meeting resolutions (Haifa Meeting)
348 	BSI             	UK National Body Comment on the MPEG Requirements
		documents
349*	Okubo           	Third progress report
350	Fauthier et al. 	Implementation study of motion compensation modes 
		in TM1
351	Zdepsky et al.  	AD-HDTV: Hardware verification of MPEG-1 syntax at 
		HDTV bit-rates
352 	Zdepsky et al.  	An MPEG Video user data and its syntax
353   	Joseph et al.   	Priority syntax for 2-tier MPEG transport
354   	Puri et al.     	Revised Specifications for Compatibility Experiments
355   	Puri et al.     	Revised Specifications for Hybrid Scalability 
		Experiments
356  	Puri et al.     	Increasing Efficiency in Frequency Scalability
357  	Puri            	Framework for Improving Quantization Options
358 	Puri            	Report on coordination of North American 
		Experiments
359* 	Bellcore        	Low-Delay Coding Experiments
360 	Wong            	Non-compatible vs Simulcast vs Compatible 
		Experiment G.3
361 	Viscito et al.  	Proposal for new Huffman codes in frequency 
		scalability syntax
362	Gonzales et al  	Experiments and proposal for field extensions to 
		frequency scalability syntax
363	Viscito et al.  	Description and Results of Experiments on 
		scalability
364  	Alves et al.    	MPEG indication functions
365*	Bellcore        	Non-compatible vs Simulcast vs Compatible
366  	Morris          	Response to WG11 question on very low bit-rate 
		audio-visual coding
367	Yonemitsu       	MPEG 1 video compliance and the patent issue
368  	Kogure et al.   	Adaptive DCT/Non-DCT Core Experiment
369  	Kogure et al.   	A proposal of chrominance coding method for the 
		adaptive frame/field algorithm of the MPEG Test 
		Model
370	Kogure et al.   	Simulation results for TM (adaptive frame/field)
371	Kogure et al.   	Compatible coding for multichannel audio
372	Schroder 	Letter to Prof. Noll
373 	Sugiyama et al  	Proposal of audio bitstream exchange
374 	Sugiyama et al  	MPEG/Audio compliance testing
375 	Yamada  	MPEG2 TM1 comments
376   	SF NB           	Comments to Resolutions of  Haifa meeting
377  	SC24            	Excerpts from CD 12087-1
378 	SC24            	Excerpts from CD 12087-3
379  	Convenor        	E-mail addresses
380  	Fritsch         	Use of the MPEG/Audio simulation software
381 	Puri et al.     	MC prediction options in field-structure pictures
382*	Bjoentegaard    	Simulation with field coding and M=1 for low delay
383 	Johnson et al.  	Results on frequency scalability core experiments
384 	Sikora et al.   	Proposal for frequency scalability experiments
385 	DIN             	Comments to the resolutions of the Haifa meeting
386 	AFNOR   	French contribution on SC29/WG11 Work
387 	KBS             	Opinions on some resolutions of ISO/IEC 
		JTC1/SC29/WG11 Haifa meeting of March 1992
388	Selinger	Implementation study of a MUVLD
389  	Convenor        	Draft letter to companies having provided patent 
		statements
390  	Sebestyen       	Letter to Convenor
391  	Knoll           	Experiments MPEG2-TM1 and UVLC
392 	SNV             	Letter to Convenor
393 	Bosch et al.    	Application profile for hierarchical TV/HDTV 
		broadcasting
394 	Liu et al.      	Experiments on frequency pyramid coding and scan 
		order of DCT
395 	ITTF            	Excerpts from DIS 11172
396*	AT&T            	Timing recovery for variable bit-rate video on ATM 
		networks
397*	CCITT EG        	Low delay mode
398* 	CCITT EG        	Cell loss resilience: issues and core experiments 
399* 	CCITT EG        	An experiment to investigate H.261 compatibility and 
		to help determine the most suitable compatible 
		prediction method
400 	AUS NB  	Invitation to 21st WG11 meeting
401 	Schamel et al.  	Description of encoder with frequency based 
		scalability for broadcast applications with 
		heterogeneous receivers
402 	Stoll           	Intention to contribute a low bitrate audio coding 
		system to ISO/IEC JTC1/SC29/WG11 Audio, Phase 2
403 	v. d. Kerkhof   	Intention to contribute a low bitrate audio coding 
		system to ISO/IEC JTC1/SC29/WG11 Audio, Phase 2
404 	Holtzman        	BUS: Demonstration employing new test footage
405 	CCIR            	Draft New Recommendation: Multi-channel 
		stereophonic system with and without accompanying 
		picture
406 	Savatier        	FAMC prediction in pure-field sequences
407 	CCIR SG11      	Statement concerning user requirements for source 
		coding and multiplexing for broadcast applications
408 	Savatier        	Extend escape range to 12 bits and intra DC 
		precision to 9 bits
409 	USA NB  	Contribution on MPEG/Audio standard
410 	Editing gr.     	Delta for TM-2
411 	Chiariglione    	Meeting notice of ad-hoc group on Video Test Model


END