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Title: Noise Abatement At Measuring And Regulating Stations
Author: William G. Birkhead
Source: 1970 American School of Gas Measurement Technology
Year Published: 1970
Abstract: First let us define some terms. What is sound? Sound is an alternation of compressions and rarefactions in an elastic medium, it can be called a physical disturbance that creates a sensation in ones ear. Sound may be pleasant, or unpleasant, soothing, exhilarating, disturbing or painful. Hence, one may insert a psychologic auditory sensation into its definition when humans are involved. Thus, when sound becomes disturbing or painful it becomes unwanted sound which is the definition of noise. One cannot talk about sound intelligently until the terms which describe its measurement are understood. A decibel is the unit of level which denotes the rato between quantities proportional to power or pressure.

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