![]() ![]() ![]() Is reduced from the maximum amplitude by a factor of 0.707 (equivalent to dividingīy the square root of 2). Pure tone-a pure sine wave-the averaging process leads to a pressure amplitude that The real average is a root mean squareĪverage which you might be familiar with if you have done some electronics. Goes above (positive) and below (negative) the constant atmospheric background soĪ straight average would tend to give zero. I am hiding a bit of complication in the word average the pressure Pressure variation away from the constant background level is the Pressure Amplitude On the weather map-however, we can consider it to be essentially constant on theĪ sound wave creates a variation in the normally constant air pressure that oscillatesĪbove and below the normal atmospheric level of 105 N/m2. The space of hours or days-this is what they mean by high and low pressure centers The atmospheric pressure varies a small amount over Atmospheric pressure is measured in newtons/meter2Īnd is approximately 105 N/m2. Variation in air pressure caused by a sound wave. Pressure amplitude is a measure of the size of the The most physically understandable quantity used in determining the size of a sound The question of what parameters are measured in determining sound levels. Thus, to begin our discussion I want to cover There are a variety of different definitions of the decibel scale depending upon the There are decibel scales defined for use in electronics and optics. ![]() Decibel scales are by no means confined to acoustics, Pressure Amplitude: Quantitative Measurement of SoundĪs we will discuss in this section decibels are a means of creating a logarithmic Decibel Scales: Sound Pressure Level and Sound Intensity Level ![]()
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