Lecture 8A - EEL 4930 Audio Engineering Lecture 8A Summary...

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Unformatted text preview: EEL 4930 Audio Engineering Lecture 8A Summary of Equations for Plane Waves in Air Problem 2 of Homework #4 relied on a lot of equations, some of which were not obvious. Lets summarize some of these equations. c = ! / k = " P / # z = ! c We have ! p ! x = " # ! u ! t , where p is pressure, u = !" ! t , u is particle velocity and ! is particle displacement. Plane-wave solutions are of the form ! ( x , t ) = ! e j ( t kx ) . Then u = ! ! t = j ! u ! t = " # 2 $ % ! p ! x = " 2 # $ = % j "# u p = z u = j z ! = u / j " = p / j " z u = j = p / z Also, ! = p j " z = p j "# c = p jk # c 2 = p jk # $ P / # = p jk $ P EEL 4930 Audio Engineering (2010) Lecture 8A HW# 6; Due # 9 1. A microphone generates an open-circuit output voltage of 1.0 mV RMS when it is exposed to a 80 dB SPL, sound at 1 kHz. (a) What is the sensitivity of the microphone in V/Pa? (b) Express this sensitivity in dBV/Pa. (c) Compare the sensitivity of this microphone to that of a Shure SM58. (d) Suppose the mic has an equivalent input noise microphone to that of a Shure SM58....
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This note was uploaded on 02/08/2011 for the course EEL 4930 taught by Professor Staff during the Spring '08 term at University of Florida.

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Lecture 8A - EEL 4930 Audio Engineering Lecture 8A Summary...

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