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Dpto. Señales, Sistemas y Radiocomunicaciones

Tratamiento Digital de Voz Prof. Luis A. Hernández Gómez ftp.gaps.ssr.upm.es/pub/TDV/DOC/ Tema2 c .ppt. Dpto. Señales, Sistemas y Radiocomunicaciones. Agenda Perceptual e valuation of Speech Quality Traditional e valuation of Speech Quality A new approach to e valuation of Speech Quality

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Dpto. Señales, Sistemas y Radiocomunicaciones

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  1. Tratamiento Digital de VozProf. Luis A. Hernández Gómezftp.gaps.ssr.upm.es/pub/TDV/DOC/Tema2c.ppt Dpto. Señales, Sistemas y Radiocomunicaciones

  2. Agenda • Perceptual evaluation of Speech Quality • Traditional evaluation of Speech Quality • A new approach to evaluation of Speech Quality • Perceptual Evaluation of Speech Quality within ITU-T

  3. A new approach to evaluation of Speech Quality The idea • To simulate the sound perception of subjects in real-life situations • To have a objective technique based on a perceptual model that will reveal the same MOS score as that of Listening Test What is MOS? • Methods and procedures for conducting subjective evaluation of transmission quality (ITU -T Rec. 800) • Quality of speech based on Listening Tests

  4. A new approach to evaluation of Speech Quality Objective techniques used for predicting subjective test scores • PSQM (Perceptual Speech Quality Measure) • PSQM+ (ITU -T Rec. 861) • PESQ (Perceptual Evaluation of Speech Quality) (ITU -T Rec. 862) • and others like MNB, PAMS, TOSQA, PACE, VQI and PESQM. About PSQM, PSQM+, PESQ • For jugging the listening and talking quality of Telephone band speech signals (300-3400Hz) • Signals of the input and output of the device under test are mapped onto a psychophysical representation that match as close as possible the internal representation inside our head

  5. Agenda • Perceptual evaluation of Speech Quality • Traditional evaluation of Speech Quality • A new approach to evaluation of Speech Quality • Perceptual Evaluation of Speech Quality within ITU-T

  6. Generic perceptual measurement algorithm Cognitive Model Is a model of the judgement behaviour of the test subject Perceptual Model Feature-Extractor Reference Quality measure Cognitive Model Perceptual Model Test Perceptual Model Is a model of the Human Ear

  7. Basic model of PSQM & PSQM+ algorithm Reference Perceptual Model Internal representation of the reference signal Quality measure Difference in internal representation Cognitive Model Test Internal representation of the test signal Perceptual Model Improvements in PSQM+ • Time alignment: variable delay, frame repeats • Weight of distortion: time clipping, time frequency distortion

  8. Basic model of PESQ algorithm Reference Level align Inputfilter Time align and equalise Auditory transform Quality measure Disturbance processing Cognitive Modelling Degraded Auditory transform Identify bad intervals Level align Inputfilter Next step is PESQM • Assessment of Handset on a perceptual basis using HATS • Covering echo and Sidetone

  9. Perceptual measurement algorithms - roadmap Intrusive Narrowband Speech Quality PSQM P.861, 1996 PSQM+ 1996 PESQ P.862, 1996 Conversational Quality Echo and Acoustical measurement Acoustical PESQ extension PESQM 2001,2002 Non-Intrusive Narrowband Speech Quality P3SQM 2001,2002 Single-ended Voice Quality Wideband Audio PEAQ BS1387, 1996 PEAQ+ 2002 Wideband Voice Quality Video measurement Audiovisual Quality PEVQ

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