1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU P.91 I Corrigendum I (09/99) SERIES P: TELEPHONE TRANSMISSION QUALITY, TELEPHONE INSTALLATIONS, LOCAL LINE NETWORKS Audiovisual quality in multimedia services Subjective audiovisual quality assessment methods
2、 for mu It i med ia applications Corrigendum I ITU-T Recommendation P.911 - Corrigendum I (Previously CCITT Recommendation) INTERNATIONAL TELECOMMUNICATION UN ION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU P.91 I Corrigendum I (09/99) SERIES P: TELEPHONE TRANSMISSION QUALITY, TELEPHONE IN
3、STALLATIONS, LOCAL LINE NETVVORKS Audiovisual quality in multimedia services Subjective audiovisual quality assessment methods for mu It i m ed i a a p p I cat ions Corrigendum 1 ITU-T Recommendation P.911 - Corrigendum I (Previously CCITT Recommendation) W 40b259L Obh8797 TO7 W ITU-T P-SERIES RECOM
4、MENDATIONS TELEPHONE TRANSMISSION QUALITY, TELEPHONE INSTALLATIONS, LOCAL LINE NETWORKS Vocabulary and effects of transmission parameters on transmission quality Subscribers lines and sets Transmission standards Objective measuring apparatus Objective electro-acoustical measurements Measurements rel
5、ated to speech loudness Methods for objective and subjective assessment of quality customer opinion of Series P.10 Series P.30 Series P.40 Series P.50 Series P.60 Series P.70 Series P.80 P.300 P.500 P.800 For Jicrther details, please refer to ITU-T List of Recommendations. ITU-T RECOMMENDATION P.911
6、 SUBJECTIVE AUDIOVISUAL QUALITY ASSESSMENT METHODS , FOR MULTIMEDIA APPLICATIONS CORRIGENDUM I Source Corrigendum 1 to ITU-T Recommendation P.911 was prepared by ITU-T Study Group 12 (1997-2000) and was approved under the WTSC Resolution No. 1 procedure on 30 September 1999. Recommendation P.911/Cor
7、l (09/99) i FOREWORD ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommunications. The-ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the ITU. The ITU-T is responsible for studying technical, operating and tari
8、ff questions and issuing Recommendatins on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, establishes the topics for study by the ITU-T Study Groups which, in their turn, produce
9、Recommendations on these topics. The approval of Recommendations by the Members of the ITU-T is covered by the procedure laid down in WTSC Resolution No. 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with IS
10、0 and IEC. NOTE in this Recommendation the term recognized operating agency (ROA) includes any individual, company, corporation or governmentai organization that operates a public correspondence service. The terms Administration, ROA and public correspondence are defined in the Constitution of the I
11、TU (Geneva, 1992). INTELLECTUAL PROPERTY RIGHTS The ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. The ITU takes no position concerning the evidence, vaiidity or applicab&ty of claimed In
12、tellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, the ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommen
13、dation. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consuit the TSB patent database. o ITU 2000 All rights reserved. No part of this publication may be reproduced or utilized m any form or by any means, electronic or mech
14、anical, including photocopying and microfilm, without permission in writing from the ITU. 11 Recornmendation P.911/Cor.1 (09/99) Recommendation P.911 8 7 6 5 4 SUBJECTIVE AUDIOVISUAL QUALITY ASSESSMENT METHODS FOR MULTIMEDIA APPLICATIONS Good Fair CORRIGENDUM 1 (Geneva, 1999) - 2 1 Bad Table 2 of Re
15、commendation P.91 I (1998) should be replaced by the following: Table 2R.911- Nine-level quality scale I 9 I Excellent I 3 I Poor Recommendation P.911ICor.l (09/99) - 1 Series A Series B Series C Series D Series E Series F Series G Series H Series I Series J Series K Series L Series M Series N Serie
16、s O Series P Series Q Series R Series S Series T Series U Series V Series X Series Y Series Z ITU-T RECOMMENDATIONS SERIES Organization of the work of the ITU-T Means of expression: definitions, symbols, classification General telecommunication statistics General tariff principles Overall network op
17、eration, telephone service, service operation and human factors Non-telephone telecommunication services Transmission systems and media, digital systems and networks Audiovisual and multimedia systems Integrated services digital network Transmission of television, sound programme and other multimedi
18、a signals Protection against interference Construction, installation and protection of cables and other elements of outside plant TMN and network maintenance: international transmission systems, telephone circuits, telegraphy, facsimile and leased circuits Maintenance: international sound programme
19、and television transmission circuits Specifications of measuring equipment Telephone transmission quality, telephone installations, local line networks Switching and signalling Telegraph transmission Telegraph services terminal equipment Terminals for telematic services Telegraph switching Data communication over the telephone network Data networks and open system communications Global information infiastructure and Internet protocol aspects Languages and general sobare aspects for telecommunication systems Printed in Switzerland Geneva, 2000
