Raake Speech Quality of VoIP

Assessment and Prediction
1. Auflage 2007
ISBN: 978-0-470-03299-2
Verlag: John Wiley & Sons
Format: PDF
Kopierschutz: Adobe DRM (»Systemvoraussetzungen)

E-Book, Englisch, 336 Seiten, E-Book

Finally a comprehensive overview of speech quality in VoIP fromthe user's perspective!
Speech Quality of VoIP is an essential guide to assessingthe speech quality of VoIP networks, whilst addressing theimplications for the design of VoIP networks and systems. This bookbridges the gap between the technical network-world and thepsychoacoustic world of quality perception. AlexanderRaake's unique perspective combines awareness of thetechnical characteristics of VoIP networks and original researchconcerning the perception of speech transmitted across them.
Starting from the network designer's point of view, thedifferent characteristics of the network are addressed, and thenlinked to features perceived by users. This book provides anoverview of the available knowledge on the principal, relevantaspects of speech and speech quality perception, of speech qualityassessment, and of transmission properties of telephone and VoIPnetworks, and of the related perceptual features and resultingspeech quality. Discussing new research into the specifictime-varying degradations VoIP brings along, but also theconsiderable potential of quality improvement to be achieved withwideband speech transmission, Alexander Raake demonstrates hownetwork and service characteristics impact on the users perceptionof quality.
Speech Quality of VoIP:
* Offers an insight into speech quality of VoIP from a user'sperspective.
* Presents an overview of different modelling approaches and aparametric network-planning model for quality prediction in VoIPnetworks.
* Draws on innovative new research on the quality degradationcharacteristic of VoIP.
* Explains in detail how telephone speech quality can be greatlyenhanced with VoIP's wideband speech transmissioncapability.
* Assesses the vast collection of references into the technicaland scientific literature related to VoIP quality.
* Illustrates concepts throughout with mathematical models,algorithms and simulations.
Speech Quality of VoIP is the definitive guide forresearchers, engineers and network planners working in the field ofVoIP, Quality of Service, and speech communication processing intelecommunications. Advanced undergraduate and graduate students ontelecommunication and networking courses will also find this textan invaluable resource.

Autoren/Hrsg.

Raake, Alexander

Inhaltsverzeichnis

Preface.
List of Abbreviations.
Introduction.
1 Speech Quality in Telephony.
1.1 Speech.
1.2 Speech Quality.
2 Speech Quality Measurement Methods.
2.1 Auditory Methods.
2.2 Instrumental Methods.
2.3 Speech Quality Measurement Methods: Summary.
3 Quality Elements and Quality Features of VoIP.
3.1 Speech Transmission Using Internet Protocol.
3.2 Overview of Quality Elements.
3.3 Quality Elements and Related Features.
3.4 Quality Dimensions.
3.5 Combined Elements and Combined Features.
3.6 Listening and Conversational Features.
3.7 Desired Nature.
3.8 Open Questions.
3.9 From Elements to Features: Modeling VoIP Speech Quality.
3.10 Quality Elements and Quality Features of VoIP: Summary.
4 Time-Varying Distortion: Quality Features andModeling.
4.1 Microscopic Loss Behavior.
4.2 Macroscopic Loss Behavior.
4.3 Interactivity.
4.4 Packet Loss and Combined Impairments.
4.5 Time-Varying Distortion: Summary.
5 Wideband Speech, Linear and Non Linear Distortion: QualityFeatures and Modeling.
5.1 Wideband Speech: Improvement Over Narrowband.
5.2 Bandpass-Filtered Speech.
5.3 Wideband Codecs.
5.4 Desired Nature.
6 From Elements to Features: Extensions of theE-model.
6.1 E-model: Packet Loss.
6.2 E-model: Additivity.
6.3 E-model: Wideband, Linear and Non-Linear Distortion.
7 Summary and Conclusions.
8 Outlook.
A Aspects of a Parametric Description of Time-VaryingDistortion.
B Simulation of Quality Elements.
C Frequency Responses.
D Test Data Normalization and Transformation.
E E-model Algorithm.
F Interactive Short Conversation Test Scenarios(iSCTs).
G Auditory Test Settings and Results.
H Modeling Details.
I Glossary.
Bibliography.
Index.