Madihally (Qualcomm, Inc. and Stanford University, California, USA) Narasimha & Tokunbo (Santa Clara University, California, USA) Ogunfunmi 
Principles of Speech Coding [PDF ebook] 

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