Wavelength is the distance between sound (compression) waves and is directly related to frequency—the higher the frequency, the shorter the wavelength. In fact, if you divide the speed of sound in air by the frequency of the sound you are interested in, the result is the wavelength. Human hearing ranges from 20 to about 20,000 […]

See Ear Wax.

See Word Discrimination testing.

The feedback sound a hearing aid makes when it does not fit tightly in the ear canal. Often the hard of hearing person does not hear this sound, but it sure annoys the people nearby. Often it is described as a squealing sound.

White noise is noise whose amplitude is constant throughout the audible frequency range. The sound of white noise is a high-pitched hissing, similar to the sound of steam escaping from an overheated radiator. White noise is produced by a random noise generator, and is used in tinnitus maskers and in Tinnitus Retraining Therapy. More technically, […]

A special circuit in some hearing aids that compresses a wide range of sounds into a narrower range. This makes soft sounds easier to hear and makes loud sounds more comfortable for listening.