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Author: admin, 11.04.2014
White noise is often taken to be equally loud at all frequencies, but this is not the case: although the sound that is produced is equally loud at all frequencies, this is not what the ear hears. To request an appointment at NYOG by email, please give us your contact information in the form below and we will get back to you shortly with available dates. As fans around the country raced to make their stadium the loudest this fall, pride wasn’t the only thing hanging in the balance. On average, accounting for peaks in cheering, stadium noise blares at around the mid-90s decibel range. As research continues on noise-related hearing problems, it’s becoming increasingly clear that once you hear “ringing” (like after leaving a stadium or a concert), there’s been some damage. Besides bringing a physical risk, in some cases, extended noises can be troublesome to those who live near stadiums. But with crowds still amping up the volume to root on their favorite teams, what’s a sports fan to do?
3) The basilar membrane inside the cochlea breaks the sound waves up into different frequencies. 4) Tiny hair cells which live on the basilar membrane translate mechanical vibrations into patterns of nerve impulses. Your basilar membrane is lined with tiny hair cells, which are responsible for converting mechanical vibration of the basilar membrane to a chemical signal that stimulates your auditory nerve.

Hair cells in your ear come in two flavours: one row of inner hair cells and three rows of outer hair cells.
The pictures below show electron micrographs of healthy hair cells (left) and hair cells after exposure to excessive noise (right). The ear is much less sensitive to low frequencies, below about 1000 Hz, and to high frequencies above about 6000 Hz, and peaks in sensitivity at around 2500 Hz. This means that after sound is recorded, a filter is applied so that the recorded sound mimics what a human ear would have heard. Grey noise is white noise that has been A-weighted so that it is heard to be equally loud at all frequencies.
All that noise has an effect on ears, and it might last much longer than just an ear-ringing ride home after the fourth quarter.
At that level, safety guidelines recommend no more than an hour of sustained noise, but most games are about triple the length. People of all ages can be susceptible to partial deafness — and it’s important to note that loud noises are the most common cause of hearing loss in general. The near ("basal") end of the basilar membrane resonates to high frequencies, and the far ("apical") end resonates to low frequencies. The inner hair cells are heavily connected to the auditory nerve, and they send sound information to your brain.

As you grow older, hair cells at the high frequency end of the cochlea also tend to wear out. This filter is called A-weighting, and the volume of sound that is recorded is referred to as dB(A). And if the fan next to you is screaming, that can be a quick hit of 120 decibels or so, about the same as a roaring chainsaw. Vibrations at different locations on the basilar membrane therefore reveal what frequencies are present in the sound.
The job of the outer hair cells, in contrast, is to amplify the sound vibrations by dancing along. This little video shows you how the vibrations might look if the basilar membrane could be "rolled out in front of you".

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