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Über dieses Buch

This book presents a new diagnostic information methodology to assess the quality of conversational telephone speech. For this, a conversation is separated into three individual conversational phases (listening, speaking, and interaction), and for each phase corresponding perceptual dimensions are identified. A new analytic test method allows gathering dimension ratings from non-expert test subjects in a direct way. The identification of the perceptual dimensions and the new test method are validated in two sophisticated conversational experiments. The dimension scores gathered with the new test method are used to determine the quality of each conversational phase, and the qualities of the three phases, in turn, are combined for overall conversational quality modeling. The conducted fundamental research forms the basis for the development of a preliminary new instrumental diagnostic conversational quality model. This multidimensional analysis of conversational telephone speech is a major landmark towards deeply analyzing conversational speech quality for diagnosis and optimization of telecommunication systems.

Inhaltsverzeichnis

Frontmatter

Chapter 1. Introduction

Abstract
Vocal human-to-human communication is the main purpose for using speech telephony services. Technological development within traditional and modern packet-based (Voice-over-IP) telephony networks can affect—and possibly also impair—the transmitted speech signal.
Friedemann Köster

Chapter 2. Fundamentals

Abstract
This book is about the quality assessment, diagnosis, and estimation of transmitted speech in a telephone conversation.
Friedemann Köster

Chapter 3. Speech Quality in a Telephone Conversation

Abstract
The previous chapter introduced the fundamentals of speech communication, the perceived speech quality, the concept of diagnosing speech quality, as well as subjective and instrumental quality assessment methods.
Friedemann Köster

Chapter 4. Perceptual Quality Space in a Telephone Conversation

Abstract
The approach of the work presented in this book is to combine the advantages of considering all possible user situations in a conversation and of diagnosing the quality of transmitted speech on the basis of perceptual dimensions.
Friedemann Köster

Chapter 5. Direct Scaling of Perceptual Dimensions in a Conversational Situation

Abstract
In the previous chapter, the perceptual quality spaces of two conversational phases, namely the Speaking and the Interaction Phase, have been explored and identified. These phases have not been part of multidimensional research in the related literature, yet.
Friedemann Köster

Chapter 6. Conversational Validation Experiments

Abstract
In the two previous chapters, the perceptual quality space in a telephone conversation (Chap. 4) and a new test method for directly scaling the identified perceptual quality dimensions in a conversational situation (Chap. 5) were presented.
Friedemann Köster

Chapter 7. Resulting Quality Profile in a Telephone Conversation

Abstract
Based on the results of the experiments conducted in Chap. 6, it is possible to analyze the relation between the overall conversational quality ratings, the overall phase quality ratings, and the dimension ratings.
Friedemann Köster

Chapter 8. Instrumental Diagnostic Conversational Quality Modeling

Abstract
The work presented in this book, so far, was conducted with the final goal to develop an instrumental diagnostic conversational quality model.
Friedemann Köster

Chapter 9. Conclusions and Future Work

Abstract
The quality of transmitted speech is a major indicator for telecommunication system providers to evaluate their services.
Friedemann Köster

Backmatter

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