Infrared systems use lightwaves to send electrical signals to receivers that convert the electrical signals back to electrical energy and then sound. FM broadcast frequencies (72-76 MHz) are designated for use by FM systems. FM systems transmit sound via radio waves. By sending the sound signal directly to the individual's ears, an ALD enables the individual to hear and understand important sounds while also reducing frustration associated with hearing unwanted background noises.There are three major types of ALD technology: FM radio signal, infrared light, and induction loop systems.
ALDs reduce problems associated with background noise in one-on-one and group communication. Assistive listening systems, also known as assistive listening devices (ALD), transmit sound directly to an individual who is wearing a sound receiver (hearing aid, headphone, neck loop etc.).
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