Fully digital models of the hearing aid arose in 1996 and from then on continued to advance (Hochheiser, 2013). These were predominantly used during the 17th, 18th and 19th centuries (Stephens & Goodwin, 1984). Interestingly, one of the first types of acoustic hearing aids available were ear trumpets which transmitted sounds to a higher or lower degree, depending on the trumpet itself. The complexity and efficiency of hearing aids, assistive listening devices and other hearing enhancers has greatly impacted upon those suffering a hearing loss. Technology available for people suffering from hearing loss has rapidly evolved over time. Here, more information can be found about ALDs and examples: (CICADA Australia Inc., 2012). Examples of other types of devices are amplifiers for speech or when using the telephone, FM (frequency modulation) systems even television captioning is classified as an ALD (Wendt, Quist, & Lloyd, 2011). Some, such as hearing aids, are electronic amplifying devices that can be attached to the ear (behind, in or in the canal of the ear). There are many different types of assistive listening devices with the intention of bringing the sound closer to the listener. Assistive Listening Devices - Signal to Noise Ratio Assistive Listening DevicesĪssistive Listening Devices (ALDs) are instruments that help to amplify auditory sounds and aid in deciphering sound, in particular, speech sounds from noise (Wendt, Quist, & Lloyd, 2011).
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