Glossary of Common Terms

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FM Systems

A wireless assistive listening device that transmits the speaker's voice to an electronic receiver in which the sound is amplified and transmitted to the deaf or hard-of-hearing person's ears via small earphones on their personal hearing aids or connected to their cochlear implant. The device reduces the problem of background noise interference and the problem of distance from the speaker.
Source: Alexander Graham Bell Association for the Deaf and Hard of Hearing


Frequency

The number of vibrations per second of a sound. Frequency, expressed in Hertz (Hz), determines the pitch of sound.
Source: Alexander Graham Bell Association for the Deaf and Hard of Hearing


Functional Listening Assessment

Used to determine how a child's listening abilities are affected by noise, distance, and visual access in natural listening environments.
Source: Supporting Success for Children with Hearing Loss