lecture2 - Introduction to Sound Goal of today's lecture To...

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Introduction to Sound Goal of today’s lecture: To understand the elementary basis of sound Scientific study of sound = Acoustics
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What is sound? All sound results from vibration. For vibration to occur, we need: a source of energy (the bow or pluck for a stringed instrument; vibration of the vocal folds for voice) something to vibrate a propagation medium (air, water, wood, etc.). No sound can occur in a vacuum.
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What is sound? Vibration can be transferred from a source of energy to something else (e.g., air). A vibrating energy source creates alternating areas of high pressure ( compressions ) and low pressure ( rarefactions ) travelling through the air. High pressure = relatively many air molecules are present in a given area Low pressure = relatively few molecules present
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Sound propagation Changes in pressure spread rapidly through a medium like air. Our ears receive these tiny molecular vibrations, and the action of the ear converts the mechanical motions to neural impulses we hear as sound.
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Sine waves The simplest kind of sound Describes: motion of a single air molecule back and forth across its rest position regular increases and decreases in pressure at one point in space as a sound wave travels across that point the pattern of high and low pressures across space at a given moment in time.
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