The decibel meter is the perfect example of how a sound can be high or low intensity. Tomeasure this intensity using a special instrument called a SPL-meter. It measures thesignal strength in audio equipment and the value in Volume Units. Sound level meters measure sound pressure level and are commonly used in noise pollution studies for the quantification of almost any noise, but especially for industrial, environmental and aircraft noise. However, the reading given by a sound level meter does not correlate well to human-perceived loudness; for this a loudness meter is needed.
Inventors: Fred L. Katzman, Cedar Grove; Archie J. Arrison Jr, Mt. Arlington.
Assignee: Ballantine Laboratories, Inc.
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