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Unwanted sound. Noise control is the process of obtaining an acceptable noise environment for people in different situations. These definitions and...


= Encyclopedia Article; = Research Update
Figure 1.Sound pressure p at one point in space, varying sinusoidally with time, in response to a source vibrating with simple harmonic motion.
From Encyclopedia article 'Acoustic noise'
Figure 10.Insertion loss of sound from a point source by a rigid barrier as a function of Fresnel number N. Negative N refers to the case where the receiver is able to see the source. (After L. L. Beranek, Noise and Vibration Control, McGraw-Hill, 1971)
From Encyclopedia article 'Acoustic noise'
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