problem of noise

Noise is any unwanted sound that, by itself, may not be harmful unless its intensity is high. Noise has physical, physiologic, psychologic connotations, all of which differ. Physically, sound can be measured and defined in terms of duration, frequency [measured in Hz], and intensity measured in sound pressure levels SPL, expressed in decibels [dB]. Sound may be continuous, intermittent, impulsive, or explosive[1]