CD411- Notes 6
CD411- Notes 6 CD 411
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This 2 page Study Guide was uploaded by Leah Larabee on Friday February 27, 2015. The Study Guide belongs to CD 411 at University of Alabama - Tuscaloosa taught by Dr. Buhr in Spring2015. Since its upload, it has received 138 views. For similar materials see Speech Science in Language at University of Alabama - Tuscaloosa.
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Date Created: 02/27/15
CD411 Chapter 4 Monday Sound Intensity and Sound Pressure The Decibel 1 Sound Energy 0 It is transferred through a medium at some rate i Power 0 The rate at which energy is transferred 0 It is expressed in Watts 0 Is the rate at which energy is consumed ii Energy The capacity to do work 0 The WATT i 1 Watt 1 Ioule s MKS 1 joule a force of 1 Newton acting through a distance of 1 meter 0 Absolute power i One sound wave is compared with the absolute power in another reference wave 39 LBVBI Wx WR o Wx is the power of interest 0 WR is the reference power The measure of level is meaningless unless WR is specified 0 Absolute intensity i Intensity energy per second per square meter 0 Unit watt m2 0 Ix IR ii Bel 0 Level gt Log10 Ix IR 0 N bels Log1o Ix IR 0 Bel is a level it is a ratio the log of the ration is called a Bel i Number of bels will be equal to ii The base is redundant 10 0 Positive be i lX gt lR ii Numerator is greater that denominator 0 Negative beI i lX lt lR ii Denominator is greater than numerator iii Decibel Decibel is 110 ofa be 0 N dB 10 Log1o Ix IR 0 0 dB means i Ix IR 0 Rules 0 For every 10 step level change in lx i dB changes by 10 dB 0 For every 2 fold level change in Ix i dB changes by m 11
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