Acknowledgments

This book is the product of a few authors and many behind-the-scenes workers who deserve recognition. Our thanks go to our editor, Brett Bartow, who did his best to keep us on track and on time, in spite of ourselves. Thanks also to Christopher Cleveland and Dan Young, our development editors, for ensuring that our words made sense. The editing and production staff had the unenviable job of making sure all spelling, grammar, punctuation, and illustrations were correct, and we are grateful for their work.

Our technical editors on this book did a great job of making sure the book was technically correct and suggesting ways to improve the content. The book would not have been as good without them. A big thank you to Danelle Au, Christina Hattingh, Sibrina Shafique, Brandon Ta, and Lingling Zhang!

Denise would like to thank the AES Engineering and Callisma groups within AT&T for the loan of lab equipment. Thanks also to Tom Petzold for helping keep this relevant.

David would like to thank the voice TEC team for their reviews and suggestions and for their insights on instruction and certification. He also wants to thank his manager, Drew Rosen, for supporting him in this and all his other efforts.

Ken would like to thank his manager, Michael Aaron, for his support during this process.