The difference between average noise level and peak noise level lies in how they represent and measure the intensity or amplitude of sound.
Average Noise Level: The average noise level is a measure of the overall sound intensity over a specific period of time. It represents the average or mean value of the sound levels measured during that time frame. The average noise level is typically expressed in decibels (dB) and is useful for assessing the overall loudness or background noise level in a particular environment. It provides a sense of the sustained or continuous sound energy present.
Peak Noise Level: The peak noise level, on the other hand, measures the maximum instantaneous sound level reached during a given period. It represents the highest point or peak of sound intensity at any moment within that timeframe. The peak noise level is also expressed in decibels (dB) and is useful for capturing sudden, brief, or transient sounds that can occur, such as a loud bang or a sudden burst of noise. It provides information about the highest intensity sound event within a given period.
To illustrate the difference, consider a situation where you are measuring the noise levels in a factory. The average noise level will give you an idea of the overall noise level in the factory throughout a specific time period, such as an hour or a day, taking into account the continuous machinery noise and background sounds. On the other hand, the peak noise level will help identify any sudden spikes or loud events that occur during that time period, such as a machine malfunction or a loud noise from a specific source.
Both average noise level and peak noise level are important metrics in assessing and managing noise exposure and its potential impact on human health and safety. Regulations and guidelines often specify limits for both average and peak noise levels to protect individuals from excessive noise exposure.