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H, M, L
An indication of the attenuation a hearing protector will provide in High, Medium and Low frequency biased noise environments.
Hair Cells
Found in the organ of Corti in the cochlea of the inner ear, these are the specialized receptors of hearing. The name refers to stereocilia, bundles of hairlike projections jutting upward from the cells. When the stereocilia are moved by sound vibrations, the hair cells translate this mechanical stimulation into an electrical nerve impulse that is carried to the brain by the auditory nerve.
Hammer
Receives vibration from eardrum, sends it to anvil, one of the smallest bones in the body.
Head Conditions
Conditions that affect the head
Hearing Aid
An electronic device that is designed to couple to the ear and to amplify and deliver sound to the ear. A basic hearing aid consists of a microphone, amplifier and receiver. Learn more
Hearing Impairment
Reduced ability to hear sounds.
Herpes Zoster Oticus
Facial and auditory effects of herpes zoster
Hertz (Hz)
Refers to a periodic or cyclically occurring phenomenon such as a sound wave. Its frequency is the number of times it repeats in one second i.e., cycles per second. The unit of frequency is the Hertz (Hz) which corresponds to 1 cycle per second.
Hyperacusis
A phenomenon where normal sounds are perceived to be abnormally loud, so much so that they are painful to listen to.
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