Overview

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)

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9781322628301

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