![]() This converter allows converting the sound pressure in pressure units into the sound pressure level in logarithmic units, which measure the effective pressure of a sound relative to the reference value of 20 μPa. The size of these air pressure changes determines the loudness of the sound and is called the sound pressure amplitude. Even the volume control variable resistors in the mixing console in the picture below are made with the logarithmic relation between the position of the knob and the resistance of the potentiometer to obtain a natural “linear” perception in sound intensity change when adjusting the volume.Īs a sound moves through the air, its pressure slightly increases and decreases. The quietest sound of a mosquito has a sound pressure of only 20 micropascals, while the loudest sound that a human can hear without permanent damage to their ears has a pressure of several hundred pascals.īecause the range of a scale for measuring sound is so large, it is convenient to use a logarithmic (decibel) scale to combine and compress the huge range of pressure amplitudes that the ear can hear. A mosquito only vibrates the air a little bit, but a turboprop engine vibrates a lot! Sound pressure, like any other pressure, is measured in pascals (Pa) or other units of pressure. ![]() The sound is a vibration of the air or other medium. We can hear a quiet sound of a mosquito flying at a distance of several meters and at the same time, we can distinguish the roar of propellers of a turboprop aircraft from a roar of a plane with turbofan engines. Our ability to hear spans an enormous range. Our hearing is an amazing thing and our ear is a very interesting organ that not only gives us the ability to hear but provides us with a sense of balance and spatial orientation. Sound Pressure Level and Distance to the Sound Sourceįrequency Weighting in Sound and Noise Measurements
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