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object-src 'none'; report-uri /w/api.php?action=cspreport&format=json; report-to csp-report-to-endpoint last-modified: Fri, 19 Jun 2026 16:05:53 GMT content-type: text/html; charset=UTF-8 age: 0 accept-ranges: bytes x-cache: cp2047 miss, cp2047 miss x-cache-status: miss server-timing: cache;desc="miss", host;desc="cp2047" strict-transport-security: max-age=106384710; includeSubDomains; preload report-to: { "group": "wm_nel", "max_age": 604800, "endpoints": [{ "url": "https://intake-logging.wikimedia.org/v1/events?stream=w3c.reportingapi.network_error&schema_uri=/w3c/reportingapi/network_error/1.0.0" }] } nel: { "report_to": "wm_nel", "max_age": 604800, "failure_fraction": 0.05, "success_fraction": 0.0} set-cookie: WMF-Last-Access=03-Jul-2026;Path=/;HttpOnly;secure;Expires=Tue, 04 Aug 2026 12:00:00 GMT set-cookie: WMF-Last-Access-Global=03-Jul-2026;Path=/;Domain=.wikipedia.org;HttpOnly;secure;Expires=Tue, 04 Aug 2026 12:00:00 GMT set-cookie: WMF-DP=7d8;Path=/;HttpOnly;secure;Expires=Sat, 04 Jul 2026 00:00:00 GMT x-client-ip: 75.28.18.94 cache-control: private, s-maxage=0, max-age=0, must-revalidate, no-transform vary: Accept-Encoding,X-Subdomain,Cookie,Authorization,User-Agent set-cookie: GeoIP=US:TX:McKinney:33.20:-96.62:v4; Path=/; secure; Domain=.wikipedia.org set-cookie: NetworkProbeLimit=0.001;Path=/;Secure;SameSite=None;Max-Age=3600 set-cookie: WMF-Uniq=fNenoMcrXECGZZevqYzRIQOSAAAAAFvdR-_ytacruqPrevwnXzpIYH8g8yhQYiD4;Domain=.wikipedia.org;Path=/;HttpOnly;secure;SameSite=None;Expires=Sat, 03 Jul 2027 00:00:00 GMT transfer-encoding: chunked x-request-id: 5582842a-d256-4799-8804-e7716e47a155 x-analytics: 8000 Perceptual Evaluation of Speech Quality - Wikipedia Jump to content Main menu Main menu move to sidebar hide Navigation Main page Contents Current events Random article About Wikipedia Contact us Contribute Help Learn to edit Community portal Recent changes Upload file Special pages Search Search Appearance Donate Create account Log in Personal tools Donate Create account Log in Contents move to sidebar hide (Top) 1 Measurement scope 2 Genealogy of related standards 3 Testing typology 4 See also 5 References 6 External links Toggle the table of contents Perceptual Evaluation of Speech Quality 3 languages Deutsch Français Português Edit links Article Talk English Read Edit View history Tools Tools move to sidebar hide Actions Read Edit View history General What links here Related changes Upload file Permanent link Page information Cite this page Get shortened URL Switch to legacy parser Print/export Download as PDF Printable version In other projects Wikidata item Appearance move to sidebar hide From Wikipedia, the free encyclopedia ITU-T standard Perceptual Evaluation of Speech Quality ( PESQ ) is a family of standards comprising a test methodology for automated assessment of the speech quality as experienced by a user of a telephony system. It was standardized as Recommendation ITU-T P.862 [ 1 ] 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 POLQA (Recommendation ITU-T P.863 [ 2 ] ) entered into force in 2011. Measurement scope [ edit ] PESQ was developed to model subjective tests commonly used in telecommunications (e.g., Recommendation ITU-T 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. [ 3 ] Genealogy of related standards [ edit ] 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) [ 1 ] in 2001. P.862 was later complemented with Recommendations ITU-T P.862.1 [ 4 ] (mapping of PESQ scores to a MOS scale), ITU-T P.862.2 [ 5 ] (wideband measurements) and ITU-T P.862.3 [ 3 ] (application guide). The first edition of ITU-T P.863 ( POLQA ) [ 2 ] 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. [ 6 ] 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 [ 7 ] (no-reference algorithm). Testing typology [ edit ] Depending on the information that is made available to an algorithm, voice-quality test algorithms can be divided into two main categories: 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). 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 [ 7 ] ) 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. 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. PESQ results principally model mean opinion scores (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. [ 4 ] See also [ edit ] Perceptual Objective Listening Quality Analysis (POLQA) Perceptual Evaluation of Video Quality (PEVQ) Perceptual Evaluation of Audio Quality (PEAQ) Hearing-Aid Speech Quality Index (HASQI) References [ edit ] 1 2 "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" . www.itu.int . Retrieved 2021-04-20 . 1 2 "P.863 : Perceptual objective listening quality prediction" . www.itu.int . Retrieved 2021-04-11 . 1 2 "P.862.3 : Application guide for objective quality measurement based on Recommendations P.862, P.862.1 and P.862.2" . www.itu.int . Retrieved 2021-04-20 . 1 2 "P.862.1 : Mapping function for transforming P.862 raw result scores to MOS-LQO" . www.itu.int . Retrieved 2021-04-11 . ↑ "P.862.2 : Wideband extension to Recommendation P.862 for the assessment of wideband telephone networks and speech codecs" . www.itu.int . Retrieved 2021-04-11 . ↑ "P.863.1 : Application guide for Recommendation ITU-T P.863" . www.itu.int . Retrieved 2021-04-11 . 1 2 "P.563 : Single-ended method for objective speech quality assessment in narrow-band telephony applications" . www.itu.int . Retrieved 2021-04-11 . Rix, Antony W.; Hollier, Michael P.; Hekstra, Andries P.; Beerends, John G. (2002-10-15). "Perceptual Evaluation of Speech Quality (PESQ) The New ITU Standard for End-to-End Speech Quality Assessment Part I--Time-Delay Compensation" . Journal of the Audio Engineering Society . 50 (10): 755–764. Beerends, John G.; Hekstra, Andries P.; Rix, Antony W.; Hollier, Michael P. (2002-10-15). "Perceptual Evaluation of Speech Quality (PESQ) The New ITU Standard for End-to-End Speech Quality Assessment Part II: Psychoacoustic Model" . Journal of the Audio Engineering Society . 50 (10): 765–778. External links [ edit ] Application Note 1GA49: Psychoacoustic Audio Quality Measurements Using R&S UPV Audio Analyzer Application Note 1MA119: PESQ Measurement for GSM with R&SCMUgo Application Note 1MA136: PESQ Measurement for CDMA2000 with R&SCMUgo Application Note 1MA137: PESQ Measurement for WCDMA with R&SCMUgo Application Note 1MA149: VoIP Measurements for WiMAX Archived 2016-12-20 at the Wayback Machine Retrieved from " https://en.wikipedia.org/w/index.php?title=Perceptual_Evaluation_of_Speech_Quality&oldid=1320904206 " Categories : ITU-T recommendations Speech codecs ITU-T P Series Recommendations International standards Telecommunications Hidden categories: Articles with short description Short description matches Wikidata Webarchive template wayback links This page was last edited on 7 November 2025, at 12:58  (UTC) . Page was rendered with Parsoid . Text is available under the Creative Commons Attribution-ShareAlike 4.0 License ; additional terms may apply. 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