PSAP Standard Review
Legislation recently passed in the U.S. House of Representatives1 and expected to be passed soon in the U.S. Senate2, requires the FDA to establish an OTC (over-the-counter) hearing aid category for adults with perceived mild-to-moderate hearing impairment, within three years. This category is estimated to overlap the hearing levels of approximately 60-80% of all hearing aids…
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An Upper Limit to Sound?
The answer is yes – there is an upper limit to sound. But this depends on how sound is identified and this article relates to sound in air. Sound in Air Sound is a series of longitudinal waves travelling in air caused by oscillations of pressure in the air (Figure 1). Sound consists of a…
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