1、 International Telecommunication Union ITU-T P.862TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Corrigendum 1(10/2007) SERIES P: TELEPHONE TRANSMISSION QUALITY, TELEPHONE INSTALLATIONS, LOCAL LINE NETWORKS Methods for objective and subjective assessment of quality Perceptual evaluation of speech q
2、uality (PESQ): An objective method for end-to-end speech quality assessment of narrow-band telephone networks and speech codecs Corrigendum 1 ITU-T Recommendation P.862 (2001) Corrigendum 1 ITU-T P-SERIES RECOMMENDATIONS TELEPHONE TRANSMISSION QUALITY, TELEPHONE INSTALLATIONS, LOCAL LINE NETWORKS Vo
3、cabulary and effects of transmission parameters on customer opinion of transmission quality Series P.10 Subscribers lines and sets Series P.30 P.300 Transmission standards Series P.40 Objective measuring apparatus Series P.50 P.500 Objective electro-acoustical measurements Series P.60 Measurements r
4、elated to speech loudness Series P.70 Methods for objective and subjective assessment of quality Series P.80 P.800 Audiovisual quality in multimedia services Series P.900 Transmission performance and QoS aspects of IP end-points Series P.1000 For further details, please refer to the list of ITU-T Re
5、commendations. ITU-T Rec. P.862 (2001)/Cor.1 (10/2007) i ITU-T Recommendation P.862 Perceptual evaluation of speech quality (PESQ): An objective method for end-to-end speech quality assessment of narrow-band telephone networks and speech codecs Corrigendum 1 Source Corrigendum 1 to ITU-T Recommendat
6、ion P.862 (2001) was agreed on 11 October 2007 by ITU-T Study Group 12 (2005-2008). ii ITU-T Rec. P.862 (2001)/Cor.1 (10/2007) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardizati
7、on 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 Assembly (WTSA), which meet
8、s 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 which fall within ITU-Ts p
9、urview, 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 this Recommendation is v
10、oluntary. 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 language such as “must“ and
11、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 Recommendation may invol
12、ve 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 of approval of this Recom
13、mendation, ITU had 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 the TSB patent database at htt
14、p:/www.itu.int/ITU-T/ipr/. ITU 2007 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. ITU-T Rec. P.862 (2001)/Cor.1 (10/2007) 1 ITU-T Recommendation P.862 Perceptual evaluation of speech quality (PESQ): An object
15、ive method for end-to-end speech quality assessment of narrow-band telephone networks and speech codecs Corrigendum 1 Table 2 should be replaced by: Table 2 PESQ is known to provide inaccurate predictions when used in conjunction with these variables, or is otherwise not intended to be used with the
16、se variables Test factors Listening levels (See Note 1.) Loudness loss Effect of delay in conversational tests Talker echo Sidetone Coding technologies Replacement of continuous sections of speech making up more than 25% of active speech by silence (extreme temporal clipping) EVRC family codecs (See
17、 Note 2.) Applications In-service non-intrusive measurement devices Two-way communications performance NOTE 1 PESQ assumes a standard listening level of 79 dB SPL and compensates for non-optimum signal levels in the input files. The subjective effect of deviation from optimum listening level is ther
18、efore not taken into account. NOTE 2 P.862 systematically under-predicts the quality of the EVRC family codecs. The comparison of different conditions (e.g., bit rates, error patterns) using EVRC is possible by P.862.1/.2 due to the correct relative ranking of the quality scores within those conditi
19、ons. For more information see clause 13 of ITU-T P.862.3. Printed in Switzerland Geneva, 2007 SERIES OF ITU-T RECOMMENDATIONS Series A Organization of the work of ITU-T Series D General tariff principles Series E Overall network operation, telephone service, service operation and human factors Serie
20、s 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 television, sound programme and other multimedia sig
21、nals 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: international sound programme and television transmission
22、circuits Series O Specifications of measuring equipment Series P Telephone transmission quality, telephone installations, local line networks Series Q Switching and signalling Series R Telegraph transmission Series S Telegraph services terminal equipment Series T Terminals for telematic services Ser
23、ies 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
