Audiology - When Hearing Aids Are Not Enough

When Hearing Aids Are Not Enough
The Need for Assistive Devices
Audiology - Diagnosis

Excerpts from Audiology Treatment provided by

CENTRUM SOUND SYSTEMS

with permission from Thieme Medical Publishers, Inc., New York, NY.

Editors
Michael Valente, Ph.D., Washington University School of Medicine, St. Louis, Missouri.
Holly Hosford-Dunn, Ph.D., Tucson Audiology Institute, Inc., Tucson, Arizona.
Ross J. Roeser, Ph.D., University of Texas at Dallas, Dallas, Texas.

Authors
Peter O. Bengtsson, Centrum Sound Systems, Redding, California.
Preben B. Brunved, Oticon Inc., Somerset, New Jersey.

Chapter 19

When Hearing Aids Are Not Enough
The Need for Assistive Devices

Outline

Page 1

Why Assistive Listening Devices?
Sound Pickup: Omnidirectional and Unidirectional Microphones; Microphone Designs for Assistive Listening Devices; Lapel/Handheld Microphones; Conference Microphones; Other Microphone Styles; Public Address Systems

Page 2

Signal Transfer Method: Hard wired Systems; Wireless Technologies
Induction Loop Systems (Teleloop): The Concept of the Induction Loop; Electromagnetic Field Strength and Frequency Response of Room Loops; Loop Amplifiers; Installation Limitations and Considerations
Frequency Modulated Broadcast Systems (FM): Frequency Modulation Technology; Wide-Band and Narrow-Band Frequencies; Narrow-Band Systems; Wide-Band Systems; Transmitter Types; FM Receiver Types
Infrared Light Systems (IR): Infrared Technology; Transmitters and Emitters; Infrared Receivers

Page 3

Batteries and Charging Systems
Sound Couplings and Fitting Options: Direct Audio Input; Physical and Electrical Standardization of Direct Audio Input; The Direct Audio Input "Boot"; Attenuation of Direct Audio Input Cords and Boots; Direct Audio Input Sources and Connections; Control Settings of the Hearing Aid; Inductive Transfer of Signals; Limitations and Drawbacks with Inductive Transfer; Electromagnetic Compatibility; Induction Coil Sensitivity; External Hearing Aid Transducers, Headsets, and Earbuds
Conclusion
Preferred Practice Guide Lines
References

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