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Ear muff |
| A hearing protector device that is placed over the ears to protect them. Earmuffs have a band that goes over or around the back of the head, or under the chin. |
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Earplug |
| A hearing protector device that is placed in the ear canal to protect against noise. Earplugs can be premolded, custom fitted or from an expandable foam. |
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Emissions (decibel) |
| The sound emitted sound will depend on several factors such as the directivity of the source produced by a source which reaches impinges on a receiver. Sound Emissions add with the ambient sound level to produce a base line sound level. |
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Energy average |
| (see Average) |
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Equivalent sound level (Leq, dB) |
| The sound level which describes the energy contained in a fluctuating sound level over a certain period of time. Any time frame may be considered e.g., one minute, one hour, or one day. |
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Excess attenuation (dB) |
| The various attenuations in a sound propagation path out-of-doors not due to increasing distance. These might be attenuation due to humidity, ground effects, wind, barriers, etc. |
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