Acoustics - Sheet1 Page 1 ''Acoustics''' is the...

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Unformatted text preview: Sheet1 Page 1 ''Acoustics''' is the interdisciplinary science that deals with the study of sound, ultrasound and infrasound (all mechanical wave Hearing is one of the most crucial means of survival in the animal world, and speech is one of the most distinctive characterist The word &quot Err:509 Err:510 Image:Overtone.jpgthumb250pxThe fundamental and the first 6 overtones of a vibrating string. Pythagoras was the first to stu The science of acoustics had its beginnings in the Greek and Roman cultures between the 6th century BCE and 1st century B The physical understanding of acoustical processes advanced rapidly during and after the Scientific Revolution. Galileo (1564 Err:510 The eighteenth century saw major advances in acoustics at the hands of the great mathematicians of that era, who applied th The twentieth century saw a burgeoning of technological applications of the large body of scientific knowledge that was by the Err:509 The study of acoustics revolves around the generation, propagation and reception of mechanical waves and vibrations. ::Image:Cause-effect_diagram_for_acoustics.jpg med The fundamental acoustical process The steps shown in the above diagram can be found in any acoustical event or process. There are many kinds of cause, both The central stage in the acoustical process is wave propagation. This falls within the domain of physical acoustics. In fluids, so Acoustics looks first at the pressure levels and frequencies in the sound wave. Transduction processes are also of special imp Err:510 In fluids such as air and water, sound waves propagate as disturbances in the ambient pressure level. While this disturbance &lt where P&lt class=&quot- ! Example of Common Sound ! Pressure Amplitude ! Decibel Level- Threshold of Hearing 20*10&lt 0 dB- Normal talking at 1m Sheet1 Page 2 .002 to .02 Pa 40 to 60 dB- Power lawnmower at 1m 2 Pa 100 dB- Threshold of Pain 200 Pa 140 dB Err:510 Physicists and acoustic engineers tend to discuss sound pressure levels in terms of frequencies, partly because this is how ou The entire spectrum can be divided into three sections: audio, ultrasonic, and infrasonic. The audio range falls between 20 H Err:510 Image:3.5 Inch Speaker.jpgthumb200pxAn inexpensive low fidelity 3.5&amp A transducer is just a device for converting one form of energy into another. A transducer is just a device for converting one form of energy into another....
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This note was uploaded on 04/30/2008 for the course CS 3304 taught by Professor Chen during the Spring '08 term at University of Houston - Downtown.

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Acoustics - Sheet1 Page 1 ''Acoustics''' is the...

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