Sound Isolation


Airborne Sound can be isolated by containing the sound from intruding beyond the source area by blocking it’s potential transmission. Sound isolation can be accomplished by creating appropriate barriers and reducing the reflected sounds in the source area by acoustical absorption within the source area.


What is Noise?


Simply stated, noise is unwanted sound. Intrusive sound that interferes with speech intelligibility or speech privacy is characterized as noise. Noise is a relative term and can range from low levels of intrusive sound in a quiet environment to very loud sounds in a already noisy environment.


Adding Decibels


When the direct sound diminishes in intensity in accordance with the inverse law the multitude of reflective sound intensities are combining to produce as increase in the reflected sound levels to a point where the reflected sound can be higher than the direct sound. A typical example of this phenomena would be a voluminous, hard surfaced gymnasium that can experience a significant build up of reflective sound intensity.

Where the direct sound and reflected sound are about equal is called the critical distance. In a typical classroom critical distance is about 12" from the source. Beyond the critical distance the sound reduction will be less than 6 dB.



 

 

 

 

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Transmission of Sound


Contrary to the popular notion that sound passes through a structure, such is not the case. Sound generated on one side of a wall will energize the wall structure and set it in motion, much like a diaphragm. The wall itself becomes the transmitter of the sound energy which can be heard on the opposite side of the wall by the listener.