Description
Book SynopsisFinally a comprehensive overview of speech quality in VoIP from the user''s perspective! Speech Quality of VoIP is an essential guide to assessing the speech quality of VoIP networks, whilst addressing the implications for the design of VoIP networks and systems. This book bridges the gap between the technical network-world and the psychoacoustic world of quality perception. Alexander Raake's unique perspectivecombines awareness of the technical characteristics of VoIP networks and original research concerning the perception of speech transmitted across them.
Starting from the network designer's point of view, the different characteristics of the network are addressed, and then linked to features perceived by users. This book provides an overview of the available knowledge on the principal, relevant aspects of speech and speech quality perception, of speech quality assessment, and of transmission properties of telephone and VoIP networks, and of the related perc
Table of Contents
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 and Modeling.
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: Quality Features 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 the E-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-Varying Distortion.
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.
