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Acoustical Accessibility Equipment
ALD Primer
Basic information that answers three primary question: What are assistive listening devices? How are they used? and What is the difference between the three principle methods of assistance and which should I use where?
Wide-Area Assistance for use in Churches & Auditoriums
Providing acoustical accessibility solutions for overcoming the acoustical problems in today’s modern church environments and other large areas of assembly requiring acoustical accessibility. Hearing Resources offer a unique blend of technologies to overcome the acoustical problems of the large-area listening environments and improve sound perception through today's modern radio frequency assistive listening technology. This section will review the radio frequency transmission methods available today. Other areas of this website will cover large-area Infrared Systems and Induction Loop Systems.Overview
Radio Frequency (RF), Infrared (IR), Wide-band (WB), or Narrow-band (NB).... With all the different types of hearing assistance products available, it's easy to get confused about which type is right for you. It all depends on your environment and application.
RF vs. IR
For applications where one signal is needed over a wide area, RF is often most appropriate. It provides consistent coverage with a single transmitter and signals pass through walls and other opaque objects. It's often a great choice for churches, auditoriums, stadiums, and classrooms.
With IR systems, transmission is confined within opaque walls, making it a good choice for movie theaters, boardrooms, courtrooms, and anywhere privacy is valued. Infrared systems are also immune to radio interference. Receiver management is easy with IR systems because there is no reason to sort for the frequency.
However, IR is not appropriate for outdoor use or where there is a lot of direct sunlight. Sunlight generates infrared interference.
When people are looking for portability or there is a need for a system that is easy to setup , volunteer labor at a church, then the FM system is the best choice.
Wide-Band (WB) vs. Narrow-band (NB)
Wide-Band FM systems are the correct choice when you need the lowest cost, a limited number of simultaneous channels, good rejection of radio interference, and the highest fidelity for voice applications. Narrow-band is an excellent choice for churches in suburban or rural areas.
Narrow-band FM systems are the correct choice when you need the highest immunity to outside radio interference, more simultaneous channels, and good fidelity for voice applications.
