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;T- <br /> 1111 <br /> THE LANGUAGE OF NOISE <br /> During this first segment of the Se•inar, we shall discuss some of <br /> the vocabulary of acoustics -- vocabulary and concepts that we shall use <br /> throughout the Seminar. <br /> During this Seminar , we are going to be talking about sound , noise <br /> (which is unwanted sound) , and vibration . In other words we are going <br /> to be talking about acoustics , the science that deals with the <br /> production , control , transmission, reception, and effects of sound. This <br /> section of the Seminar will introduce you to the basic vocabulary and <br /> theories of acoustics , particularly those you will need for a discussion <br /> of airport noise . Our discussion of vibration will be minijmal , because <br /> almost all airport-related vibrations are noise-induced. That is , noise <br /> from an aircraft makes windows vibrate and rattle . Because inoise causes <br /> vibration , control of airport noise will result in control of vibration <br /> as well . <br /> You cannot discuss airport ( or any other) noise without knowing <br /> 411111 <br /> some of the vocabulary o f' acoustics . The most important term s for you to <br /> understand concern three aspects of sound : its loudness , Its pitch , and <br /> how long it lasts . The terms you must understand are : <br /> ( • Sound pressure <br /> ) • Sound pressure level <br /> Loudness • Decibels <br /> • Addition of decibels <br /> • Frequency <br /> Pitch • Weighting network <br /> • Pure tones <br /> How long it 1 • Duration of sound. <br /> lasts <br /> Each of these terms is explained in this section . <br /> 3 <br /> • <br />