1、 International Telecommunication Union ITU-T P.835TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Corrigendum 1(01/2011) SERIES P: TERMINALS AND SUBJECTIVE AND OBJECTIVE ASSESSMENT METHODS Methods for objective and subjective assessment of speech quality Subjective test methodology for evaluating sp
2、eech communication systems that include noise suppression algorithm Corrigendum 1 Recommendation ITU-T P.835 (2003) Corrigendum 1 ITU-T P-SERIES RECOMMENDATIONS TERMINALS AND SUBJECTIVE AND OBJECTIVE ASSESSMENT METHODS Vocabulary and effects of transmission parameters on customer opinion of transmis
3、sion quality Series P.10 Voice terminal characteristics Series P.30 P.300 Reference systems Series P.40 Objective measuring apparatus Series P.50 P.500 Objective electro-acoustical measurements Series P.60 Measurements related to speech loudness Series P.70 Methods for objective and subjective asses
4、sment of speech quality Series P.80P.800Audiovisual quality in multimedia services Series P.900 Transmission performance and QoS aspects of IP end-points Series P.1000 Communications involving vehicles Series P.1100 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T P
5、835 (2003)/Cor.1 (01/2011) i Recommendation ITU-T P.835 Subjective test methodology for evaluating speech communication systems that include noise suppression algorithm Corrigendum 1 History Edition Recommendation Approval Study Group 1.0 ITU-T P.835 2003-11-13 12 1.1 ITU-T P.835 (2003) Amend. 1 20
6、07-10-11 12 1.2 ITU-T P.835 (2003) Cor. 1 2011-01-27 12 ii Rec. ITU-T P.835 (2003)/Cor.1 (01/2011) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecomm
7、unication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Asse
8、mbly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology whi
9、ch fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with t
10、his Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure, e.g., interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory lan
11、guage such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this
12、 Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date
13、of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult t
14、he TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2011 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T P.835 (2003)/Cor.1 (01/2011) 1 Recommendation ITU-T P.835 Subjective test methodology
15、for evaluating speech communication systems that include noise suppression algorithm Corrigendum 1 Clause 5.1.3 of Recommendation ITU-T P.835 includes a description of Figures 1 and 2. Those descriptions are reversed the description for Figure 1 applies to Figure 2 and the description for Figure 2 a
16、pplies to Figure 1. The two paragraphs describing the figures should be revised as shown below: 5.1.3 Reference conditions The reference conditions shall be selected to independently vary the signal and background ratings through their entire range of scale values. For example, speech in background
17、noise should be varied along two dimensions, Speech-to-Noise Ratio (SNR) for varying the background ratings and MNRU for varying the signal ratings. Figure 1 illustrates the relative independence of the signal background score and the correlation of the overall score to the background signal score w
18、hen MNRU is varied while keeping SNR constant. Figure 2 illustrates the relative independence of the background signal score and the correlation of the overall score to the signal background score when SNR is varied while keeping MNRU constant. Figure 3 shows that the introduction of these combined
19、reference conditions provide a full context within this two-dimensional perceptual space (signal/background). Printed in Switzerland Geneva, 2011 SERIES OF ITU-T RECOMMENDATIONS Series A Organization of the work of ITU-T Series D General tariff principles Series E Overall network operation, telephon
20、e service, service operation and human factors Series F Non-telephone telecommunication services Series G Transmission systems and media, digital systems and networks Series H Audiovisual and multimedia systems Series I Integrated services digital network Series J Cable networks and transmission of
21、television, sound programme and other multimedia signals Series K Protection against interference Series L Construction, installation and protection of cables and other elements of outside plant Series M Telecommunication management, including TMN and network maintenance Series N Maintenance: intern
22、ational sound programme and television transmission circuits Series O Specifications of measuring equipment Series P Terminals and subjective and objective assessment methods Series Q Switching and signalling Series R Telegraph transmission Series S Telegraph services terminal equipment Series T Ter
23、minals for telematic services Series U Telegraph switching Series V Data communication over the telephone network Series X Data networks, open system communications and security Series Y Global information infrastructure, Internet protocol aspects and next-generation networks Series Z Languages and general software aspects for telecommunication systems
