Handbook for Sound Engineers, 4th Edition

Chapter 42

 

Assistive Listening Systems

 

by Glen Ballou

42.1 Nature of the Problem

42.2 Types of Assistive Listening Systems

42.2.1 Magnetic Induction Loops

42.2.1.1 Loop Design Criteria

42.2.2 Loop Location and Size

42.2.2.1 Loop Current

42.2.2.2 Loop Impedance

42.2.2.3 Electronic System

42.2.2.4 Installation

42.2.3 FM Broadcast

42.2.4 AM Broadcast

42.2.5 Infrared

42.2.5.1 Components of an Infrared System

42.2.5.2 Categories

42.2.5.3 Coverage

42.2.5.4 Ambient Light

42.2.5.5 The infrared Link

42.3 Receivers

References

42.1 Nature of the Problem

There are millions of people in the world (20 million in America alone) with hearing impairments for whom the acoustical and electronic systems described elsewhere in this book are inadequate. It is ...