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by: Leah Larabee

129

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1

# CD411- Notes 7 CD 411

Leah Larabee
UA
GPA 3.7
Speech Science
Dr. Buhr

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COURSE
Speech Science
PROF.
Dr. Buhr
TYPE
Class Notes
PAGES
1
WORDS
KARMA
25 ?

## Popular in Language

This 1 page Class Notes was uploaded by Leah Larabee on Friday March 6, 2015. The Class Notes belongs to CD 411 at University of Alabama - Tuscaloosa taught by Dr. Buhr in Spring2015. Since its upload, it has received 129 views. For similar materials see Speech Science in Language at University of Alabama - Tuscaloosa.

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Date Created: 03/06/15
CH4 Absolute Intensity dB level of 0 does not mean there is not sound Reference and absolute intensity are the same Test question 0 The reference intensity must always be specified I Standard reference I 103912 wattm2 I Two steps to follow for decibel problems 1 Select equation to use 2 Form a ration gt calculate log of ration gt multiply by 10 0 SHORT CUTSLIDE 34 0 Example Given dB IL 1 dB IL 20 Ratio d8 I 2 Divide by 10 a 2 20 1010gUX1012 I Z 1 3 Antilog a 3 2 log IX1042 20 E l3 4 Exp Law 1 a ixi 1012 390 3902 2 IL 1010g1X1012 quot396 quot392 E I0 I0 81 40 0 Example leen Ix 1 Ix 10396 wattm2 Ratio an 1 2 dB 10 log 106103912 1quot 3 3 dB 10 log 106 Mm lo 4 13 60 2 quot I3 I A decibel is 10 times the log of any 4 quot no intensity or power ratio 100 23 I A decibel is 20 times the log of a pressure 40 26 ratio Absolute pressure ratio dB 20 10910 PXPr o Pr is the reference pressure 0 Pr is 20 uPa I Pr 2 x 101 uPa 0 Example 1 dB SPL 2010g10 2 x 106 2 x 101 100

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