- Outline
- 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
- Signal Transfer Method
- Hardwired 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
- Frequency Modulation Technology
- Wide-Band and Narrow-Band Frequencies
- Narrow-Band Systems
- Wide-Band Systems
- Transmitter Types
- FM Receiver Types
- Infrared Light Systems
- Infrared Technology
- Transmitters and Emitters
- Infrared Receivers
- 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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