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The absolute threshold of hearing is the minimum sound level of a pure tone that an average human ear can hear. It is frequency-dependent and reaches as low as -9 dB SPL at 2-5 kHz.
The human hearing range is commonly given as 20 to 20,000 Hz, but varies with age and individual. Some animals, such as dolphins, bats, elephants and whales, can hear much higher or lower frequencies than humans.
An equal-loudness contour is a measure of sound pressure level for which a listener perceives a constant loudness. The human ear is most sensitive between 2 and 5 kHz, and the ISO standard curves reflect this and other factors.
11 Free Road Trip Apps for Kids. Download some of these apps to your phone or your kid’s tablet to squash the backseat boredom. ... because even with headphones on, your kids will be repeating ...
Raycon has an amazing selection of best selling earbuds, headphones and more which rival the most popular brands — but best of all, they’re significantly less expensive. ... If you’re ...
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[3] [10] Although specific regulations vary across the world, most workplace best practices consider 85 decibels (dB A-weighted) averaged over eight hours per day as the highest safe exposure level for a 40-year lifetime. Using an exchange rate, typically 3 dB, allowable listening time is halved as the sound level increases by the selected rate.
An audiogram is a graph that shows the audible threshold for standardized frequencies as measured by an audiometer. The Y axis represents intensity measured in decibels (dB) and the X axis represents frequency measured in hertz (Hz). Learn how audiograms are produced, what normal and abnormal hearing thresholds are, and how they can help diagnose different types of hearing loss.
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