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Since Wikipedia aims to be a repository of images and information that anyone can use, even in nations where generous United States "fair use" provisions are inapplicable, we can only use images that are released under a so-called "free license", which permits anyone else to use, modify, or deal commercially with the image concerned if they ...
A hearing test provides an evaluation of the sensitivity of a person's sense of hearing and is most often performed by an audiologist using an audiometer. An audiometer is used to determine a person's hearing sensitivity at different frequencies. There are other hearing tests as well, e.g., Weber test and Rinne test.
User:R. Baley/Acquire a free image — "How-To" guide for acquiring free images for novices (5 steps). Note that the example involves contacting the article subject, who is not always the copyright holder. Wikipedia:Requesting free content — Another useful guide. Wikipedia:Finding images tutorial; commons:Commons:WikiProject Permission requests
Hearing sensitivity varies according to the frequency of sounds. To take this into account, hearing sensitivity can be measured for a range of frequencies and plotted on an audiogram. Other method for quantifying hearing loss is a hearing test using a mobile application or hearing aid application, which includes a hearing test.
REAT systems rely on the subjective response of the person being tested to determine auditory thresholds much like a hearing test where the subject indicates when sound is heard at various frequencies. According to the acoustic standards, REAT testing of hearing protection devices must be tested in an acoustic chamber with a diffuse sound field.
This prevents the non-test ear from detecting the test signal presented to the test ear. The threshold of the test ear is measured at the same time as presenting the masking noise to the non-test ear. Thus, thresholds obtained when masking has been applied, provide an accurate representation of the true hearing threshold level of the test ear. [13]
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