Description

It is becoming increasingly apparent that all forms of communication--including voice--will be transmitted through packet-switched networks based on the Internet Protocol (IP). Therefore, the design of modern devices that rely on speech interfaces, such as cell phones and PDAs, requires a complete and up-to-date understanding of the basics of speech coding.

Outlines key signal processing algorithms used to mitigate impairments to speech quality in VoIP networks

Offering a detailed yet easily accessible introduction to the field, Principles of Speech Coding provides an in-depth examination of the underlying signal processing techniques used in speech coding. The authors present coding standards from various organizations, including the International Telecommunication Union (ITU). With a focus on applications such as Voice-over-IP telephony, this comprehensive text covers recent research findings on topics including:

A general introduction to speech processing
Digital signal processing concepts
Sampling theory and related topics
Principles of pulse code modulation (PCM) and adaptive differential pulse code modulation (ADPCM) standards
Linear prediction (LP) and use of the linear predictive coding (LPC) model
Vector quantization and its applications in speech coding
Case studies of practical speech coders from ITU and others
The Internet low-bit-rate coder (ILBC)

Developed from the authors' combined teachings, this book also illustrates its contents by providing a real-time implementation of a speech coder on a digital signal processing chip. With its balance of theory and practical coverage, it is ideal for senior-level undergraduate and graduate students in electrical and computer engineering. It is also suitable for engineers and researchers designing or using speech coding systems in their work.