Page 56 - April 2008

Book Title: Transducers and Arrays for Underwater Sound
Authors: Charles H. Sherman and John L. Butler
Series Editors: Ralph R. Goodman, Homer P. Bucker, Ira Dyer and Jeffrey A. Simmen Corrected second printing
Publisher: Springer
ISBN 978-0-387-32940-6
Pages: 612
Illustrations: 388
Binding: Hardcover
This is the second volume in the Office of Naval Research monograph series in the field of under- water acoustics. The subject of this book is the theory, development and design of electroacoustics transducers for underwater applications. It is more comprehensive than any existing book in this field. It includes the basics of the six major types of electroacoustic transducers, with emphasis on the piezoelectric ceramic transducers that are currently most widely used. It presents the basic acoustics, as well as specific acoustic data, needed in transducer design and includes analysis of nonlinear effects in transducers. A large number of specific transducer designs, including both projectors and hydrophones, are described in detail as well as methods of modeling, evaluation and measurement. Analysis of transducer arrays, including the effects of mutual radiation imped- ance, as well as numerical models for transducers and arrays are also covered. This book contains an extensive Appendix of useful current information, including data on the latest transduction materials, and numerous diagrams that will facilitate its use by students and practicing engineers and scientists. A complete set of exercises and solutions from the book are currently available on the Springer website.
7,049,503
43.75.Tv HYBRID WIND INSTRUMENT SELECTIVELY PRODUCING ACOUSTIC TONES AND ELECTRIC TONES AND ELECTRONIC SYSTEM USED THEREIN
Naoyuki Onozawa and Kazuhiro Fujita, assignors to Yamaha Corporation
23 May 2006 (Class 84Õ723); filed in Japan 31 March 2004
The Yamaha WX-7 was a very successful electronic clarinet: it used a velocity sensor mouthpiece and electronic switches to create a MIDI stream suitable for input to a MIDI synthesizer. In this update, Yamaha creates an electronic saxophone.
The most interesting aspect is the “tounging sensor”—an infrared light is radiated back toward the player’s tongue and is then sensed. The ability to control reed vibration by bit- ing on the reed is not addressed.—MK
54 Acoustics Today, April 2008