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Lecture 1 General_Acoustics

Lecture 1 General_Acoustics - LIN 4930 General Acoustics...

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LIN 4930 General Acoustics
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Introduction In order to classify an unknown signal as an example of a particular type of sound (a gunshot, mechanical noise, a voice), one has to be able to describe and measure the basic properties of sound. Definition of sound: The motion of an object (including vibrations) transmitted through a medium as a wave Common media: Gas (air), liquid (water), solid (wall) The medium through which vibrations are transmitted are to some degree elastic Ex: Pebble hitting the surface of a pond
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Definition of sound Motions involve the disturbance of molecules Adjacent molecules “bump” into one another Compressed Rarefied Periodic : Regular alternation of compression and rarefaction results in a cycle Aperiodic : Random compression and rarefaction of molecules
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Example of Vibratory Movement: Tuning Fork Rest Force (inward displacement) Elasticity (rest position) Inertia (outward displacement) Elasticity (rest position) Etc.
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