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noexcerpt noprint searchaux" style="display:none">ITU-T standard</div> <p><b>Perceptual Evaluation of Speech Quality</b> (<b>PESQ</b>) is a family of standards comprising a test methodology for automated assessment of the speech quality as experienced by a user of a <a href="/wiki/Telephony" title="Telephony">telephony</a> system. It was standardized as Recommendation <a href="/wiki/ITU-T" title="ITU-T">ITU-T</a> P.862<sup id="cite_ref-:1_1-0" class="reference"><a href="#cite_note-:1-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> in 2001. PESQ is used for objective voice quality testing by phone manufacturers, network equipment vendors and telecom operators. Its usage requires a license. The first edition of PESQ's successor <a href="/wiki/Perceptual_Objective_Listening_Quality_Analysis" title="Perceptual Objective Listening Quality Analysis">POLQA</a> (Recommendation ITU-T P.863<sup id="cite_ref-:0_2-0" class="reference"><a href="#cite_note-:0-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>) entered into force in 2011. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Measurement_scope">Measurement scope</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Perceptual_Evaluation_of_Speech_Quality&action=edit&section=1" title="Edit section: Measurement scope"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>PESQ was developed to model subjective tests commonly used in telecommunications (e.g., Recommendation <a href="/wiki/ITU-T" title="ITU-T">ITU-T</a> P.800) to assess the voice quality perceived by human beings. Consequently, it employs true voice samples as test signals. In order to characterize the listening quality as perceived by users, it is of paramount importance to load modern telecom equipment with speech-like signals. Many systems are optimized for speech and would respond in an unpredictable way to non-speech signals (e.g., tones, noise). Guidelines for proper applications of voice test samples are defined in the PESQ application guide contained in Recommendation ITU-T P.862.3.<sup id="cite_ref-:2_3-0" class="reference"><a href="#cite_note-:2-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Genealogy_of_related_standards">Genealogy of related standards</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Perceptual_Evaluation_of_Speech_Quality&action=edit&section=2" title="Edit section: Genealogy of related standards"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>ITU-T's family of full reference objective voice quality measurements started in 1997 with Recommendation ITU-T P.861 (PSQM), which was superseded by ITU-T P.862 (PESQ)<sup id="cite_ref-:1_1-1" class="reference"><a href="#cite_note-:1-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> in 2001. P.862 was later complemented with Recommendations ITU-T P.862.1<sup id="cite_ref-:3_4-0" class="reference"><a href="#cite_note-:3-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> (mapping of PESQ scores to a MOS scale), ITU-T P.862.2<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> (wideband measurements) and ITU-T P.862.3<sup id="cite_ref-:2_3-1" class="reference"><a href="#cite_note-:2-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> (application guide). The first edition of ITU-T P.863 (<a href="/wiki/Perceptual_Objective_Listening_Quality_Analysis" title="Perceptual Objective Listening Quality Analysis">POLQA</a>)<sup id="cite_ref-:0_2-1" class="reference"><a href="#cite_note-:0-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> entered into force in 2011. An Application guide for Recommendation ITU-T P.863 was approved in 2019 and published as ITU-T P.863.1.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> </p><p>In addition to the above listed full reference methods, the list of ITU-T's objective voice quality measurement standards also includes ITU-T P.563<sup id="cite_ref-:4_7-0" class="reference"><a href="#cite_note-:4-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> (no-reference algorithm). </p> <div class="mw-heading mw-heading2"><h2 id="Testing_typology">Testing typology</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Perceptual_Evaluation_of_Speech_Quality&action=edit&section=3" title="Edit section: Testing typology"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Depending on the information that is made available to an algorithm, voice-quality test algorithms can be divided into two main categories: </p> <ul><li>A "full reference" (FR) algorithm has access to and makes use of the original reference signal for a comparison (i.e., a difference analysis). It can compare each sample of the reference signal (talker side) to each corresponding sample of the degraded signal (listener side). FR measurements deliver the highest accuracy and repeatability but can only be applied for dedicated tests in live networks (e.g., drive test tools for mobile network benchmarks).</li> <li>A "no reference" (NR) algorithm only uses the degraded signal for the quality estimation and has no information of the original reference signal. NR algorithms (e.g., Recommendation ITU-T P.563<sup id="cite_ref-:4_7-1" class="reference"><a href="#cite_note-:4-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup>) are low-accuracy estimates only, as the originating voice characteristics (e.g., male or female talker, background noise, non-voice) of the source reference is completely unknown. A common variant of NR algorithms does not even analyze the decoded audio signal, but works on an analysis of the digital bit stream on an IP packet level. The measurement is consequently limited to a transport-stream analysis.</li></ul> <p>PESQ is a full-reference algorithm and analyzes the speech signal sample-by-sample after a temporal alignment of corresponding excerpts of reference and test signal. PESQ can be applied to provide an end-to-end (E2E) quality assessment for a network, or characterize individual network components. </p><p>PESQ results principally model <a href="/wiki/Mean_opinion_score" title="Mean opinion score">mean opinion scores</a> (MOS) that cover a scale from 1 (bad) to 5 (excellent). A mapping function to MOS-LQO is outlined in Recommendation ITU-T P.862.1.<sup id="cite_ref-:3_4-1" class="reference"><a href="#cite_note-:3-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Perceptual_Evaluation_of_Speech_Quality&action=edit&section=4" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Perceptual_Objective_Listening_Quality_Analysis" title="Perceptual Objective Listening Quality Analysis">Perceptual Objective Listening Quality Analysis</a> (POLQA)</li> <li><a href="/wiki/Perceptual_Evaluation_of_Video_Quality" title="Perceptual Evaluation of Video Quality">Perceptual Evaluation of Video Quality</a> (PEVQ)</li> <li><a href="/wiki/Perceptual_Evaluation_of_Audio_Quality" title="Perceptual Evaluation of Audio Quality">Perceptual Evaluation of Audio Quality</a> (PEAQ)</li> <li><a href="/wiki/Hearing-Aid_Speech_Quality_Index" title="Hearing-Aid Speech Quality Index">Hearing-Aid Speech Quality Index</a> (HASQI)</li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Perceptual_Evaluation_of_Speech_Quality&action=edit&section=5" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output 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(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.itu.int/rec/T-REC-P.862">"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"</a>. <i>www.itu.int</i><span class="reference-accessdate">. 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Retrieved <span class="nowrap">2021-04-11</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=www.itu.int&rft.atitle=P.862.1+%3A+Mapping+function+for+transforming+P.862+raw+result+scores+to+MOS-LQO&rft_id=https%3A%2F%2Fwww.itu.int%2Frec%2FT-REC-P.862.1&rfr_id=info%3Asid%2Fen.wikipedia.org%3APerceptual+Evaluation+of+Speech+Quality" class="Z3988"></span></span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.itu.int/rec/T-REC-P.862.2">"P.862.2 : Wideband extension to Recommendation P.862 for the assessment of wideband telephone networks and speech codecs"</a>. <i>www.itu.int</i><span class="reference-accessdate">. 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(2002-10-15). <a rel="nofollow" class="external text" href="http://www.aes.org/e-lib/browse.cfm?elib=11062">"Perceptual Evaluation of Speech Quality (PESQ) The New ITU Standard for End-to-End Speech Quality Assessment Part II: Psychoacoustic Model"</a>. <i>Journal of the Audio Engineering Society</i>. <b>50</b> (10): 765–778.</li></ul> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Perceptual_Evaluation_of_Speech_Quality&action=edit&section=6" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="https://www.rohde-schwarz.com/us/applications/psychoacoustic-audio-quality-measurements-using-r-s-upv-audio-analyzer-application-note_56280-15608.html">Application Note 1GA49: Psychoacoustic Audio Quality Measurements Using R&S UPV Audio Analyzer</a></li> <li><a rel="nofollow" class="external text" href="https://www.rohde-schwarz.com/us/applications/pesq-measurement-for-gsm-with-r-s-cmugo-application-note_56280-15636.html">Application Note 1MA119: PESQ Measurement for GSM with R&SCMUgo</a></li> <li><a rel="nofollow" class="external text" href="https://www.rohde-schwarz.com/us/applications/pesq-measurement-for-cdma2000-with-r-s-cmugo-application-note_56280-15878.html">Application Note 1MA136: PESQ Measurement for CDMA2000 with R&SCMUgo</a></li> <li><a rel="nofollow" class="external text" href="https://www.rohde-schwarz.com/us/applications/pesq-measurement-for-wcdma-with-r-s-cmugo-application-note_56280-15742.html">Application Note 1MA137: PESQ Measurement for WCDMA with R&SCMUgo</a></li> <li><a rel="nofollow" class="external text" href="https://www.rohde-schwarz.com/ae/applications/voip-measurements-for-wimax-application-note_56280-15612.html">Application Note 1MA149: VoIP Measurements for WiMAX</a></li></ul>    </div><noscript><img src="https://auth.wikimedia.org/loginwiki/wiki/Special:CentralAutoLogin/start?useformat=desktop&type=1x1&usesul3=1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://en.wikipedia.org/w/index.php?title=Perceptual_Evaluation_of_Speech_Quality&oldid=1237181660">https://en.wikipedia.org/w/index.php?title=Perceptual_Evaluation_of_Speech_Quality&oldid=1237181660</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Help:Category" title="Help:Category">Categories</a>: <ul><li><a href="/wiki/Category:ITU-T_recommendations" title="Category:ITU-T recommendations">ITU-T recommendations</a></li><li><a href="/wiki/Category:Speech_codecs" title="Category:Speech codecs">Speech codecs</a></li><li><a href="/wiki/Category:ITU-T_P_Series_Recommendations" title="Category:ITU-T P Series Recommendations">ITU-T P Series Recommendations</a></li><li><a href="/wiki/Category:International_standards" title="Category:International standards">International standards</a></li><li><a href="/wiki/Category:Telecommunications" title="Category:Telecommunications">Telecommunications</a></li></ul></div><div id="mw-hidden-catlinks" class="mw-hidden-catlinks mw-hidden-cats-hidden">Hidden categories: <ul><li><a href="/wiki/Category:Articles_with_short_description" title="Category:Articles with short description">Articles with short description</a></li><li><a href="/wiki/Category:Short_description_matches_Wikidata" title="Category:Short description matches Wikidata">Short description matches Wikidata</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> This page was last edited on 28 July 2024, at 14:47<span class="anonymous-show"> (UTC)</span>.</li> <li id="footer-info-copyright">Text is available under the <a href="/wiki/Wikipedia:Text_of_the_Creative_Commons_Attribution-ShareAlike_4.0_International_License" title="Wikipedia:Text of the Creative Commons Attribution-ShareAlike 4.0 International License">Creative Commons Attribution-ShareAlike 4.0 License</a>; additional terms may apply. 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cdx-button--weight-quiet cdx-button--icon-only" id="ca-ve-edit-sticky-header" tabindex="-1" data-event-name="ve-edit-sticky-header"><span class="vector-icon mw-ui-icon-wikimedia-edit mw-ui-icon-wikimedia-wikimedia-edit"></span> <span></span> </a> <a href="#" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only" id="ca-viewsource-sticky-header" tabindex="-1" data-event-name="ve-edit-protected-sticky-header"><span class="vector-icon mw-ui-icon-wikimedia-editLock mw-ui-icon-wikimedia-wikimedia-editLock"></span> <span></span> </a> </div> <div class="vector-sticky-header-buttons"> <button class="cdx-button cdx-button--weight-quiet mw-interlanguage-selector" id="p-lang-btn-sticky-header" tabindex="-1" data-event-name="ui.dropdown-p-lang-btn-sticky-header"><span class="vector-icon mw-ui-icon-wikimedia-language mw-ui-icon-wikimedia-wikimedia-language"></span> <span>3 languages</span> </button> <a href="#" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive" id="ca-addsection-sticky-header" tabindex="-1" data-event-name="addsection-sticky-header"><span class="vector-icon mw-ui-icon-speechBubbleAdd-progressive mw-ui-icon-wikimedia-speechBubbleAdd-progressive"></span> <span>Add topic</span> </a> </div> <div class="vector-sticky-header-icon-end"> <div class="vector-user-links"> </div> </div> </div> </div> </div> <div class="mw-portlet mw-portlet-dock-bottom emptyPortlet" id="p-dock-bottom"> <ul> </ul> </div> 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